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#
# (C) Copyright 2000 - 2013
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
#
# SPDX-License-Identifier: GPL-2.0+
#
Summary:
========
This directory contains the source code for U-Boot, a boot loader for
Embedded boards based on PowerPC, ARM, MIPS and several other
processors, which can be installed in a boot ROM and used to
initialize and test the hardware or to download and run application
code.
The development of U-Boot is closely related to Linux: some parts of
the source code originate in the Linux source tree, we have some
header files in common, and special provision has been made to
support booting of Linux images.
Some attention has been paid to make this software easily
configurable and extendable. For instance, all monitor commands are
implemented with the same call interface, so that it's very easy to
add new commands. Also, instead of permanently adding rarely used
code (for instance hardware test utilities) to the monitor, you can
load and run it dynamically.
Status:
=======
In general, all boards for which a configuration option exists in the
Makefile have been tested to some extent and can be considered
"working". In fact, many of them are used in production systems.
In case of problems see the CHANGELOG and CREDITS files to find out
who contributed the specific port. The boards.cfg file lists board
maintainers.
Note: There is no CHANGELOG file in the actual U-Boot source tree;
it can be created dynamically from the Git log using:
make CHANGELOG
Where to get help:
==================
In case you have questions about, problems with or contributions for
U-Boot you should send a message to the U-Boot mailing list at
<u-boot@lists.denx.de>. There is also an archive of previous traffic
on the mailing list - please search the archive before asking FAQ's.
Please see http://lists.denx.de/pipermail/u-boot and
http://dir.gmane.org/gmane.comp.boot-loaders.u-boot
Where to get source code:
=========================
The U-Boot source code is maintained in the git repository at
git://www.denx.de/git/u-boot.git ; you can browse it online at
http://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary
The "snapshot" links on this page allow you to download tarballs of
any version you might be interested in. Official releases are also
available for FTP download from the ftp://ftp.denx.de/pub/u-boot/
directory.
Pre-built (and tested) images are available from
ftp://ftp.denx.de/pub/u-boot/images/
Where we come from:
===================
- start from 8xxrom sources
- create PPCBoot project (http://sourceforge.net/projects/ppcboot)
- clean up code
- make it easier to add custom boards
- make it possible to add other [PowerPC] CPUs
- extend functions, especially:
* Provide extended interface to Linux boot loader
* S-Record download
* network boot
* PCMCIA / CompactFlash / ATA disk / SCSI ... boot
- create ARMBoot project (http://sourceforge.net/projects/armboot)
- add other CPU families (starting with ARM)
- create U-Boot project (http://sourceforge.net/projects/u-boot)
- current project page: see http://www.denx.de/wiki/U-Boot
Names and Spelling:
===================
The "official" name of this project is "Das U-Boot". The spelling
"U-Boot" shall be used in all written text (documentation, comments
in source files etc.). Example:
This is the README file for the U-Boot project.
File names etc. shall be based on the string "u-boot". Examples:
include/asm-ppc/u-boot.h
#include <asm/u-boot.h>
Variable names, preprocessor constants etc. shall be either based on
the string "u_boot" or on "U_BOOT". Example:
U_BOOT_VERSION u_boot_logo
IH_OS_U_BOOT u_boot_hush_start
Versioning:
===========
Starting with the release in October 2008, the names of the releases
were changed from numerical release numbers without deeper meaning
into a time stamp based numbering. Regular releases are identified by
names consisting of the calendar year and month of the release date.
Additional fields (if present) indicate release candidates or bug fix
releases in "stable" maintenance trees.
Examples:
U-Boot v2009.11 - Release November 2009
U-Boot v2009.11.1 - Release 1 in version November 2009 stable tree
U-Boot v2010.09-rc1 - Release candiate 1 for September 2010 release
Directory Hierarchy:
====================
/arch Architecture specific files
/arc Files generic to ARC architecture
/cpu CPU specific files
/arc700 Files specific to ARC 700 CPUs
/lib Architecture specific library files
/arm Files generic to ARM architecture
/cpu CPU specific files
/arm720t Files specific to ARM 720 CPUs
/arm920t Files specific to ARM 920 CPUs
/at91 Files specific to Atmel AT91RM9200 CPU
/imx Files specific to Freescale MC9328 i.MX CPUs
/s3c24x0 Files specific to Samsung S3C24X0 CPUs
/arm926ejs Files specific to ARM 926 CPUs
/arm1136 Files specific to ARM 1136 CPUs
/pxa Files specific to Intel XScale PXA CPUs
/sa1100 Files specific to Intel StrongARM SA1100 CPUs
/lib Architecture specific library files
/avr32 Files generic to AVR32 architecture
/cpu CPU specific files
/lib Architecture specific library files
/blackfin Files generic to Analog Devices Blackfin architecture
/cpu CPU specific files
/lib Architecture specific library files
/m68k Files generic to m68k architecture
/cpu CPU specific files
/mcf52x2 Files specific to Freescale ColdFire MCF52x2 CPUs
/mcf5227x Files specific to Freescale ColdFire MCF5227x CPUs
/mcf532x Files specific to Freescale ColdFire MCF5329 CPUs
/mcf5445x Files specific to Freescale ColdFire MCF5445x CPUs
/mcf547x_8x Files specific to Freescale ColdFire MCF547x_8x CPUs
/lib Architecture specific library files
/microblaze Files generic to microblaze architecture
/cpu CPU specific files
/lib Architecture specific library files
/mips Files generic to MIPS architecture
/cpu CPU specific files
/mips32 Files specific to MIPS32 CPUs
/mips64 Files specific to MIPS64 CPUs
/lib Architecture specific library files
/nds32 Files generic to NDS32 architecture
/cpu CPU specific files
/n1213 Files specific to Andes Technology N1213 CPUs
/lib Architecture specific library files
/nios2 Files generic to Altera NIOS2 architecture
/cpu CPU specific files
/lib Architecture specific library files
/openrisc Files generic to OpenRISC architecture
/cpu CPU specific files
/lib Architecture specific library files
/powerpc Files generic to PowerPC architecture
/cpu CPU specific files
/mpc5xx Files specific to Freescale MPC5xx CPUs
/mpc5xxx Files specific to Freescale MPC5xxx CPUs
/mpc8xx Files specific to Freescale MPC8xx CPUs
/mpc8260 Files specific to Freescale MPC8260 CPUs
/mpc85xx Files specific to Freescale MPC85xx CPUs
/ppc4xx Files specific to AMCC PowerPC 4xx CPUs
/lib Architecture specific library files
/sh Files generic to SH architecture
/cpu CPU specific files
/sh2 Files specific to sh2 CPUs
/sh3 Files specific to sh3 CPUs
/sh4 Files specific to sh4 CPUs
/lib Architecture specific library files
/sparc Files generic to SPARC architecture
/cpu CPU specific files
/leon2 Files specific to Gaisler LEON2 SPARC CPU
/leon3 Files specific to Gaisler LEON3 SPARC CPU
/lib Architecture specific library files
/x86 Files generic to x86 architecture
/cpu CPU specific files
/lib Architecture specific library files
/api Machine/arch independent API for external apps
/board Board dependent files
/common Misc architecture independent functions
/disk Code for disk drive partition handling
/doc Documentation (don't expect too much)
/drivers Commonly used device drivers
/dts Contains Makefile for building internal U-Boot fdt.
/examples Example code for standalone applications, etc.
/fs Filesystem code (cramfs, ext2, jffs2, etc.)
/include Header Files
/lib Files generic to all architectures
/libfdt Library files to support flattened device trees
/lzma Library files to support LZMA decompression
/lzo Library files to support LZO decompression
/net Networking code
/post Power On Self Test
/spl Secondary Program Loader framework
/tools Tools to build S-Record or U-Boot images, etc.
Software Configuration:
=======================
Configuration is usually done using C preprocessor defines; the
rationale behind that is to avoid dead code whenever possible.
There are two classes of configuration variables:
* Configuration _OPTIONS_:
These are selectable by the user and have names beginning with
"CONFIG_".
* Configuration _SETTINGS_:
These depend on the hardware etc. and should not be meddled with if
you don't know what you're doing; they have names beginning with
"CONFIG_SYS_".
Later we will add a configuration tool - probably similar to or even
identical to what's used for the Linux kernel. Right now, we have to
do the configuration by hand, which means creating some symbolic
links and editing some configuration files. We use the TQM8xxL boards
as an example here.
Selection of Processor Architecture and Board Type:
---------------------------------------------------
For all supported boards there are ready-to-use default
configurations available; just type "make <board_name>_defconfig".
Example: For a TQM823L module type:
cd u-boot
make TQM823L_defconfig
For the Cogent platform, you need to specify the CPU type as well;
e.g. "make cogent_mpc8xx_defconfig". And also configure the cogent
directory according to the instructions in cogent/README.
Sandbox Environment:
--------------------
U-Boot can be built natively to run on a Linux host using the 'sandbox'
board. This allows feature development which is not board- or architecture-
specific to be undertaken on a native platform. The sandbox is also used to
run some of U-Boot's tests.
See board/sandbox/README.sandbox for more details.
Board Initialisation Flow:
--------------------------
This is the intended start-up flow for boards. This should apply for both
SPL and U-Boot proper (i.e. they both follow the same rules). At present SPL
mostly uses a separate code path, but the funtion names and roles of each
function are the same. Some boards or architectures may not conform to this.
At least most ARM boards which use CONFIG_SPL_FRAMEWORK conform to this.
Execution starts with start.S with three functions called during init after
that. The purpose and limitations of each is described below.
lowlevel_init():
- purpose: essential init to permit execution to reach board_init_f()
- no global_data or BSS
- there is no stack (ARMv7 may have one but it will soon be removed)
- must not set up SDRAM or use console
- must only do the bare minimum to allow execution to continue to
board_init_f()
- this is almost never needed
- return normally from this function
board_init_f():
- purpose: set up the machine ready for running board_init_r():
i.e. SDRAM and serial UART
- global_data is available
- stack is in SRAM
- BSS is not available, so you cannot use global/static variables,
only stack variables and global_data
Non-SPL-specific notes:
- dram_init() is called to set up DRAM. If already done in SPL this
can do nothing
SPL-specific notes:
- you can override the entire board_init_f() function with your own
version as needed.
- preloader_console_init() can be called here in extremis
- should set up SDRAM, and anything needed to make the UART work
- these is no need to clear BSS, it will be done by crt0.S
- must return normally from this function (don't call board_init_r()
directly)
Here the BSS is cleared. For SPL, if CONFIG_SPL_STACK_R is defined, then at
this point the stack and global_data are relocated to below
CONFIG_SPL_STACK_R_ADDR. For non-SPL, U-Boot is relocated to run at the top of
memory.
board_init_r():
- purpose: main execution, common code
- global_data is available
- SDRAM is available
- BSS is available, all static/global variables can be used
- execution eventually continues to main_loop()
Non-SPL-specific notes:
- U-Boot is relocated to the top of memory and is now running from
there.
SPL-specific notes:
- stack is optionally in SDRAM, if CONFIG_SPL_STACK_R is defined and
CONFIG_SPL_STACK_R_ADDR points into SDRAM
- preloader_console_init() can be called here - typically this is
done by defining CONFIG_SPL_BOARD_INIT and then supplying a
spl_board_init() function containing this call
- loads U-Boot or (in falcon mode) Linux
Configuration Options:
----------------------
Configuration depends on the combination of board and CPU type; all
such information is kept in a configuration file
"include/configs/<board_name>.h".
Example: For a TQM823L module, all configuration settings are in
"include/configs/TQM823L.h".
Many of the options are named exactly as the corresponding Linux
kernel configuration options. The intention is to make it easier to
build a config tool - later.
The following options need to be configured:
- CPU Type: Define exactly one, e.g. CONFIG_MPC85XX.
- Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS.
- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
Define exactly one, e.g. CONFIG_ATSTK1002
- CPU Module Type: (if CONFIG_COGENT is defined)
Define exactly one of
CONFIG_CMA286_60_OLD
--- FIXME --- not tested yet:
CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
CONFIG_CMA287_23, CONFIG_CMA287_50
- Motherboard Type: (if CONFIG_COGENT is defined)
Define exactly one of
CONFIG_CMA101, CONFIG_CMA102
- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
Define one or more of
CONFIG_CMA302
- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
Define one or more of
CONFIG_LCD_HEARTBEAT - update a character position on
the LCD display every second with
a "rotator" |\-/|\-/
- Marvell Family Member
CONFIG_SYS_MVFS - define it if you want to enable
multiple fs option at one time
for marvell soc family
- 8xx CPU Options: (if using an MPC8xx CPU)
CONFIG_8xx_GCLK_FREQ - deprecated: CPU clock if
get_gclk_freq() cannot work
e.g. if there is no 32KHz
reference PIT/RTC clock
CONFIG_8xx_OSCLK - PLL input clock (either EXTCLK
or XTAL/EXTAL)
- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
CONFIG_SYS_8xx_CPUCLK_MIN
CONFIG_SYS_8xx_CPUCLK_MAX
CONFIG_8xx_CPUCLK_DEFAULT
See doc/README.MPC866
CONFIG_SYS_MEASURE_CPUCLK
Define this to measure the actual CPU clock instead
of relying on the correctness of the configured
values. Mostly useful for board bringup to make sure
the PLL is locked at the intended frequency. Note
that this requires a (stable) reference clock (32 kHz
RTC clock or CONFIG_SYS_8XX_XIN)
CONFIG_SYS_DELAYED_ICACHE
Define this option if you want to enable the
ICache only when Code runs from RAM.
- 85xx CPU Options:
CONFIG_SYS_PPC64
Specifies that the core is a 64-bit PowerPC implementation (implements
the "64" category of the Power ISA). This is necessary for ePAPR
compliance, among other possible reasons.
CONFIG_SYS_FSL_TBCLK_DIV
Defines the core time base clock divider ratio compared to the
system clock. On most PQ3 devices this is 8, on newer QorIQ
devices it can be 16 or 32. The ratio varies from SoC to Soc.
CONFIG_SYS_FSL_PCIE_COMPAT
Defines the string to utilize when trying to match PCIe device
tree nodes for the given platform.
CONFIG_SYS_PPC_E500_DEBUG_TLB
Enables a temporary TLB entry to be used during boot to work
around limitations in e500v1 and e500v2 external debugger
support. This reduces the portions of the boot code where
breakpoints and single stepping do not work. The value of this
symbol should be set to the TLB1 entry to be used for this
purpose.
CONFIG_SYS_FSL_ERRATUM_A004510
Enables a workaround for erratum A004510. If set,
then CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV and
CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY must be set.
CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV
CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV2 (optional)
Defines one or two SoC revisions (low 8 bits of SVR)
for which the A004510 workaround should be applied.
The rest of SVR is either not relevant to the decision
of whether the erratum is present (e.g. p2040 versus
p2041) or is implied by the build target, which controls
whether CONFIG_SYS_FSL_ERRATUM_A004510 is set.
See Freescale App Note 4493 for more information about
this erratum.
CONFIG_A003399_NOR_WORKAROUND
Enables a workaround for IFC erratum A003399. It is only
required during NOR boot.
CONFIG_A008044_WORKAROUND
Enables a workaround for T1040/T1042 erratum A008044. It is only
required during NAND boot and valid for Rev 1.0 SoC revision
CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY
This is the value to write into CCSR offset 0x18600
according to the A004510 workaround.
CONFIG_SYS_FSL_DSP_DDR_ADDR
This value denotes start offset of DDR memory which is
connected exclusively to the DSP cores.
CONFIG_SYS_FSL_DSP_M2_RAM_ADDR
This value denotes start offset of M2 memory
which is directly connected to the DSP core.
CONFIG_SYS_FSL_DSP_M3_RAM_ADDR
This value denotes start offset of M3 memory which is directly
connected to the DSP core.
CONFIG_SYS_FSL_DSP_CCSRBAR_DEFAULT
This value denotes start offset of DSP CCSR space.
CONFIG_SYS_FSL_SINGLE_SOURCE_CLK
Single Source Clock is clocking mode present in some of FSL SoC's.
In this mode, a single differential clock is used to supply
clocks to the sysclock, ddrclock and usbclock.
CONFIG_SYS_CPC_REINIT_F
This CONFIG is defined when the CPC is configured as SRAM at the
time of U-boot entry and is required to be re-initialized.
CONFIG_DEEP_SLEEP
Indicates this SoC supports deep sleep feature. If deep sleep is
supported, core will start to execute uboot when wakes up.
- Generic CPU options:
CONFIG_SYS_GENERIC_GLOBAL_DATA
Defines global data is initialized in generic board board_init_f().
If this macro is defined, global data is created and cleared in
generic board board_init_f(). Without this macro, architecture/board
should initialize global data before calling board_init_f().
CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN
Defines the endianess of the CPU. Implementation of those
values is arch specific.
CONFIG_SYS_FSL_DDR
Freescale DDR driver in use. This type of DDR controller is
found in mpc83xx, mpc85xx, mpc86xx as well as some ARM core
SoCs.
CONFIG_SYS_FSL_DDR_ADDR
Freescale DDR memory-mapped register base.
CONFIG_SYS_FSL_DDR_EMU
Specify emulator support for DDR. Some DDR features such as
deskew training are not available.
CONFIG_SYS_FSL_DDRC_GEN1
Freescale DDR1 controller.
CONFIG_SYS_FSL_DDRC_GEN2
Freescale DDR2 controller.
CONFIG_SYS_FSL_DDRC_GEN3
Freescale DDR3 controller.
CONFIG_SYS_FSL_DDRC_GEN4
Freescale DDR4 controller.
CONFIG_SYS_FSL_DDRC_ARM_GEN3
Freescale DDR3 controller for ARM-based SoCs.
CONFIG_SYS_FSL_DDR1
Board config to use DDR1. It can be enabled for SoCs with
Freescale DDR1 or DDR2 controllers, depending on the board
implemetation.
CONFIG_SYS_FSL_DDR2
Board config to use DDR2. It can be eanbeld for SoCs with
Freescale DDR2 or DDR3 controllers, depending on the board
implementation.
CONFIG_SYS_FSL_DDR3
Board config to use DDR3. It can be enabled for SoCs with
Freescale DDR3 or DDR3L controllers.
CONFIG_SYS_FSL_DDR3L
Board config to use DDR3L. It can be enabled for SoCs with
DDR3L controllers.
CONFIG_SYS_FSL_DDR4
Board config to use DDR4. It can be enabled for SoCs with
DDR4 controllers.
CONFIG_SYS_FSL_IFC_BE
Defines the IFC controller register space as Big Endian
CONFIG_SYS_FSL_IFC_LE
Defines the IFC controller register space as Little Endian
CONFIG_SYS_FSL_PBL_PBI
It enables addition of RCW (Power on reset configuration) in built image.
Please refer doc/README.pblimage for more details
CONFIG_SYS_FSL_PBL_RCW
It adds PBI(pre-boot instructions) commands in u-boot build image.
PBI commands can be used to configure SoC before it starts the execution.
Please refer doc/README.pblimage for more details
CONFIG_SPL_FSL_PBL
It adds a target to create boot binary having SPL binary in PBI format
concatenated with u-boot binary.
CONFIG_SYS_FSL_DDR_BE
Defines the DDR controller register space as Big Endian
CONFIG_SYS_FSL_DDR_LE
Defines the DDR controller register space as Little Endian
CONFIG_SYS_FSL_DDR_SDRAM_BASE_PHY
Physical address from the view of DDR controllers. It is the
same as CONFIG_SYS_DDR_SDRAM_BASE for all Power SoCs. But
it could be different for ARM SoCs.
CONFIG_SYS_FSL_DDR_INTLV_256B
DDR controller interleaving on 256-byte. This is a special
interleaving mode, handled by Dickens for Freescale layerscape
SoCs with ARM core.
CONFIG_SYS_FSL_DDR_MAIN_NUM_CTRLS
Number of controllers used as main memory.
CONFIG_SYS_FSL_OTHER_DDR_NUM_CTRLS
Number of controllers used for other than main memory.
CONFIG_SYS_FSL_SEC_BE
Defines the SEC controller register space as Big Endian
CONFIG_SYS_FSL_SEC_LE
Defines the SEC controller register space as Little Endian
- Intel Monahans options:
CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
Defines the Monahans run mode to oscillator
ratio. Valid values are 8, 16, 24, 31. The core
frequency is this value multiplied by 13 MHz.
CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
Defines the Monahans turbo mode to oscillator
ratio. Valid values are 1 (default if undefined) and
2. The core frequency as calculated above is multiplied
by this value.
- MIPS CPU options:
CONFIG_SYS_INIT_SP_OFFSET
Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack
pointer. This is needed for the temporary stack before
relocation.
CONFIG_SYS_MIPS_CACHE_MODE
Cache operation mode for the MIPS CPU.
See also arch/mips/include/asm/mipsregs.h.
Possible values are:
CONF_CM_CACHABLE_NO_WA
CONF_CM_CACHABLE_WA
CONF_CM_UNCACHED
CONF_CM_CACHABLE_NONCOHERENT
CONF_CM_CACHABLE_CE
CONF_CM_CACHABLE_COW
CONF_CM_CACHABLE_CUW
CONF_CM_CACHABLE_ACCELERATED
CONFIG_SYS_XWAY_EBU_BOOTCFG
Special option for Lantiq XWAY SoCs for booting from NOR flash.
See also arch/mips/cpu/mips32/start.S.
CONFIG_XWAY_SWAP_BYTES
Enable compilation of tools/xway-swap-bytes needed for Lantiq
XWAY SoCs for booting from NOR flash. The U-Boot image needs to
be swapped if a flash programmer is used.
- ARM options:
CONFIG_SYS_EXCEPTION_VECTORS_HIGH
Select high exception vectors of the ARM core, e.g., do not
clear the V bit of the c1 register of CP15.
CONFIG_SYS_THUMB_BUILD
Use this flag to build U-Boot using the Thumb instruction
set for ARM architectures. Thumb instruction set provides
better code density. For ARM architectures that support
Thumb2 this flag will result in Thumb2 code generated by
GCC.
CONFIG_ARM_ERRATA_716044
CONFIG_ARM_ERRATA_742230
CONFIG_ARM_ERRATA_743622
CONFIG_ARM_ERRATA_751472
CONFIG_ARM_ERRATA_794072
CONFIG_ARM_ERRATA_761320
CONFIG_ARM_ERRATA_845369
If set, the workarounds for these ARM errata are applied early
during U-Boot startup. Note that these options force the
workarounds to be applied; no CPU-type/version detection
exists, unlike the similar options in the Linux kernel. Do not
set these options unless they apply!
NOTE: The following can be machine specific errata. These
do have ability to provide rudimentary version and machine
specific checks, but expect no product checks.
CONFIG_ARM_ERRATA_430973
CONFIG_ARM_ERRATA_454179
CONFIG_ARM_ERRATA_621766
CONFIG_ARM_ERRATA_798870
- Tegra SoC options:
CONFIG_TEGRA_SUPPORT_NON_SECURE
Support executing U-Boot in non-secure (NS) mode. Certain
impossible actions will be skipped if the CPU is in NS mode,
such as ARM architectural timer initialization.
- Linux Kernel Interface:
CONFIG_CLOCKS_IN_MHZ
U-Boot stores all clock information in Hz
internally. For binary compatibility with older Linux
kernels (which expect the clocks passed in the
bd_info data to be in MHz) the environment variable
"clocks_in_mhz" can be defined so that U-Boot
converts clock data to MHZ before passing it to the
Linux kernel.
When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
"clocks_in_mhz=1" is automatically included in the
default environment.
CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only]
When transferring memsize parameter to Linux, some versions
expect it to be in bytes, others in MB.
Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
CONFIG_OF_LIBFDT
New kernel versions are expecting firmware settings to be
passed using flattened device trees (based on open firmware
concepts).
CONFIG_OF_LIBFDT
* New libfdt-based support
* Adds the "fdt" command
* The bootm command automatically updates the fdt
OF_CPU - The proper name of the cpus node (only required for
MPC512X and MPC5xxx based boards).
OF_SOC - The proper name of the soc node (only required for
MPC512X and MPC5xxx based boards).
OF_TBCLK - The timebase frequency.
OF_STDOUT_PATH - The path to the console device
boards with QUICC Engines require OF_QE to set UCC MAC
addresses
CONFIG_OF_BOARD_SETUP
Board code has addition modification that it wants to make
to the flat device tree before handing it off to the kernel
CONFIG_OF_SYSTEM_SETUP
Other code has addition modification that it wants to make
to the flat device tree before handing it off to the kernel.
This causes ft_system_setup() to be called before booting
the kernel.
CONFIG_OF_BOOT_CPU
This define fills in the correct boot CPU in the boot
param header, the default value is zero if undefined.
CONFIG_OF_IDE_FIXUP
U-Boot can detect if an IDE device is present or not.
If not, and this new config option is activated, U-Boot
removes the ATA node from the DTS before booting Linux,
so the Linux IDE driver does not probe the device and
crash. This is needed for buggy hardware (uc101) where
no pull down resistor is connected to the signal IDE5V_DD7.
CONFIG_MACH_TYPE [relevant for ARM only][mandatory]
This setting is mandatory for all boards that have only one
machine type and must be used to specify the machine type
number as it appears in the ARM machine registry
(see http://www.arm.linux.org.uk/developer/machines/).
Only boards that have multiple machine types supported
in a single configuration file and the machine type is
runtime discoverable, do not have to use this setting.
- vxWorks boot parameters:
bootvx constructs a valid bootline using the following
environments variables: bootfile, ipaddr, serverip, hostname.
It loads the vxWorks image pointed bootfile.
CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
CONFIG_SYS_VXWORKS_ADD_PARAMS
Add it at the end of the bootline. E.g "u=username pw=secret"
Note: If a "bootargs" environment is defined, it will overwride
the defaults discussed just above.
- Cache Configuration:
CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot
CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot
CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot
- Cache Configuration for ARM:
CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache
controller
CONFIG_SYS_PL310_BASE - Physical base address of PL310
controller register space
- Serial Ports:
CONFIG_PL010_SERIAL
Define this if you want support for Amba PrimeCell PL010 UARTs.
CONFIG_PL011_SERIAL
Define this if you want support for Amba PrimeCell PL011 UARTs.
CONFIG_PL011_CLOCK
If you have Amba PrimeCell PL011 UARTs, set this variable to
the clock speed of the UARTs.
CONFIG_PL01x_PORTS
If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
define this to a list of base addresses for each (supported)
port. See e.g. include/configs/versatile.h
CONFIG_PL011_SERIAL_RLCR
Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
have separate receive and transmit line control registers. Set
this variable to initialize the extra register.
CONFIG_PL011_SERIAL_FLUSH_ON_INIT
On some platforms (e.g. U8500) U-Boot is loaded by a second stage
boot loader that has already initialized the UART. Define this
variable to flush the UART at init time.
CONFIG_SERIAL_HW_FLOW_CONTROL
Define this variable to enable hw flow control in serial driver.
Current user of this option is drivers/serial/nsl16550.c driver
- Console Interface:
Depending on board, define exactly one serial port
(like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
console by defining CONFIG_8xx_CONS_NONE
Note: if CONFIG_8xx_CONS_NONE is defined, the serial
port routines must be defined elsewhere
(i.e. serial_init(), serial_getc(), ...)
CONFIG_CFB_CONSOLE
Enables console device for a color framebuffer. Needs following
defines (cf. smiLynxEM, i8042)
VIDEO_FB_LITTLE_ENDIAN graphic memory organisation
(default big endian)
VIDEO_HW_RECTFILL graphic chip supports
rectangle fill
(cf. smiLynxEM)
VIDEO_HW_BITBLT graphic chip supports
bit-blit (cf. smiLynxEM)
VIDEO_VISIBLE_COLS visible pixel columns
(cols=pitch)
VIDEO_VISIBLE_ROWS visible pixel rows
VIDEO_PIXEL_SIZE bytes per pixel
VIDEO_DATA_FORMAT graphic data format
(0-5, cf. cfb_console.c)
VIDEO_FB_ADRS framebuffer address
VIDEO_KBD_INIT_FCT keyboard int fct
(i.e. i8042_kbd_init())
VIDEO_TSTC_FCT test char fct
(i.e. i8042_tstc)
VIDEO_GETC_FCT get char fct
(i.e. i8042_getc)
CONFIG_CONSOLE_CURSOR cursor drawing on/off
(requires blink timer
cf. i8042.c)
CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
CONFIG_CONSOLE_TIME display time/date info in
upper right corner
(requires CONFIG_CMD_DATE)
CONFIG_VIDEO_LOGO display Linux logo in
upper left corner
CONFIG_VIDEO_BMP_LOGO use bmp_logo.h instead of
linux_logo.h for logo.
Requires CONFIG_VIDEO_LOGO
CONFIG_CONSOLE_EXTRA_INFO
additional board info beside
the logo
When CONFIG_CFB_CONSOLE_ANSI is defined, console will support
a limited number of ANSI escape sequences (cursor control,
erase functions and limited graphics rendition control).
When CONFIG_CFB_CONSOLE is defined, video console is
default i/o. Serial console can be forced with
environment 'console=serial'.
When CONFIG_SILENT_CONSOLE is defined, all console
messages (by U-Boot and Linux!) can be silenced with
the "silent" environment variable. See
doc/README.silent for more information.
CONFIG_SYS_CONSOLE_BG_COL: define the backgroundcolor, default
is 0x00.
CONFIG_SYS_CONSOLE_FG_COL: define the foregroundcolor, default
is 0xa0.
- Console Baudrate:
CONFIG_BAUDRATE - in bps
Select one of the baudrates listed in
CONFIG_SYS_BAUDRATE_TABLE, see below.
CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
- Console Rx buffer length
With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
the maximum receive buffer length for the SMC.
This option is actual only for 82xx and 8xx possible.
If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
must be defined, to setup the maximum idle timeout for
the SMC.
- Pre-Console Buffer:
Prior to the console being initialised (i.e. serial UART
initialised etc) all console output is silently discarded.
Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
buffer any console messages prior to the console being
initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
bytes are output before the console is initialised, the
earlier bytes are discarded.
'Sane' compilers will generate smaller code if
CONFIG_PRE_CON_BUF_SZ is a power of 2
- Safe printf() functions
Define CONFIG_SYS_VSNPRINTF to compile in safe versions of
the printf() functions. These are defined in
include/vsprintf.h and include snprintf(), vsnprintf() and
so on. Code size increase is approximately 300-500 bytes.
If this option is not given then these functions will
silently discard their buffer size argument - this means
you are not getting any overflow checking in this case.
- Boot Delay: CONFIG_BOOTDELAY - in seconds
Delay before automatically booting the default image;
set to -1 to disable autoboot.
set to -2 to autoboot with no delay and not check for abort
(even when CONFIG_ZERO_BOOTDELAY_CHECK is defined).
See doc/README.autoboot for these options that
work with CONFIG_BOOTDELAY. None are required.
CONFIG_BOOT_RETRY_TIME
CONFIG_BOOT_RETRY_MIN
CONFIG_AUTOBOOT_KEYED
CONFIG_AUTOBOOT_PROMPT
CONFIG_AUTOBOOT_DELAY_STR
CONFIG_AUTOBOOT_STOP_STR
CONFIG_AUTOBOOT_DELAY_STR2
CONFIG_AUTOBOOT_STOP_STR2
CONFIG_ZERO_BOOTDELAY_CHECK
CONFIG_RESET_TO_RETRY
- Autoboot Command:
CONFIG_BOOTCOMMAND
Only needed when CONFIG_BOOTDELAY is enabled;
define a command string that is automatically executed
when no character is read on the console interface
within "Boot Delay" after reset.
CONFIG_BOOTARGS
This can be used to pass arguments to the bootm
command. The value of CONFIG_BOOTARGS goes into the
environment value "bootargs".
CONFIG_RAMBOOT and CONFIG_NFSBOOT
The value of these goes into the environment as
"ramboot" and "nfsboot" respectively, and can be used
as a convenience, when switching between booting from
RAM and NFS.
- Bootcount:
CONFIG_BOOTCOUNT_LIMIT
Implements a mechanism for detecting a repeating reboot
cycle, see:
http://www.denx.de/wiki/view/DULG/UBootBootCountLimit
CONFIG_BOOTCOUNT_ENV
If no softreset save registers are found on the hardware
"bootcount" is stored in the environment. To prevent a
saveenv on all reboots, the environment variable
"upgrade_available" is used. If "upgrade_available" is
0, "bootcount" is always 0, if "upgrade_available" is
1 "bootcount" is incremented in the environment.
So the Userspace Applikation must set the "upgrade_available"
and "bootcount" variable to 0, if a boot was successfully.
- Pre-Boot Commands:
CONFIG_PREBOOT
When this option is #defined, the existence of the
environment variable "preboot" will be checked
immediately before starting the CONFIG_BOOTDELAY
countdown and/or running the auto-boot command resp.
entering interactive mode.
This feature is especially useful when "preboot" is
automatically generated or modified. For an example
see the LWMON board specific code: here "preboot" is
modified when the user holds down a certain
combination of keys on the (special) keyboard when
booting the systems
- Serial Download Echo Mode:
CONFIG_LOADS_ECHO
If defined to 1, all characters received during a
serial download (using the "loads" command) are
echoed back. This might be needed by some terminal
emulations (like "cu"), but may as well just take
time on others. This setting #define's the initial
value of the "loads_echo" environment variable.
- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
CONFIG_KGDB_BAUDRATE
Select one of the baudrates listed in
CONFIG_SYS_BAUDRATE_TABLE, see below.
- Monitor Functions:
Monitor commands can be included or excluded
from the build by using the #include files
<config_cmd_all.h> and #undef'ing unwanted
commands, or using <config_cmd_default.h>
and augmenting with additional #define's
for wanted commands.
The default command configuration includes all commands
except those marked below with a "*".
CONFIG_CMD_AES AES 128 CBC encrypt/decrypt
CONFIG_CMD_ASKENV * ask for env variable
CONFIG_CMD_BDI bdinfo
CONFIG_CMD_BEDBUG * Include BedBug Debugger
CONFIG_CMD_BMP * BMP support
CONFIG_CMD_BSP * Board specific commands
CONFIG_CMD_BOOTD bootd
CONFIG_CMD_BOOTI * ARM64 Linux kernel Image support
CONFIG_CMD_CACHE * icache, dcache
CONFIG_CMD_CLK * clock command support
CONFIG_CMD_CONSOLE coninfo
CONFIG_CMD_CRC32 * crc32
CONFIG_CMD_DATE * support for RTC, date/time...
CONFIG_CMD_DHCP * DHCP support
CONFIG_CMD_DIAG * Diagnostics
CONFIG_CMD_DS4510 * ds4510 I2C gpio commands
CONFIG_CMD_DS4510_INFO * ds4510 I2C info command
CONFIG_CMD_DS4510_MEM * ds4510 I2C eeprom/sram commansd
CONFIG_CMD_DS4510_RST * ds4510 I2C rst command
CONFIG_CMD_DTT * Digital Therm and Thermostat
CONFIG_CMD_ECHO echo arguments
CONFIG_CMD_EDITENV edit env variable
CONFIG_CMD_EEPROM * EEPROM read/write support
CONFIG_CMD_ELF * bootelf, bootvx
CONFIG_CMD_ENV_CALLBACK * display details about env callbacks
CONFIG_CMD_ENV_FLAGS * display details about env flags
CONFIG_CMD_ENV_EXISTS * check existence of env variable
CONFIG_CMD_EXPORTENV * export the environment
CONFIG_CMD_EXT2 * ext2 command support
CONFIG_CMD_EXT4 * ext4 command support
CONFIG_CMD_FS_GENERIC * filesystem commands (e.g. load, ls)
that work for multiple fs types
CONFIG_CMD_FS_UUID * Look up a filesystem UUID
CONFIG_CMD_SAVEENV saveenv
CONFIG_CMD_FDC * Floppy Disk Support
CONFIG_CMD_FAT * FAT command support
CONFIG_CMD_FLASH flinfo, erase, protect
CONFIG_CMD_FPGA FPGA device initialization support
CONFIG_CMD_FUSE * Device fuse support
CONFIG_CMD_GETTIME * Get time since boot
CONFIG_CMD_GO * the 'go' command (exec code)
CONFIG_CMD_GREPENV * search environment
CONFIG_CMD_HASH * calculate hash / digest
CONFIG_CMD_HWFLOW * RTS/CTS hw flow control
CONFIG_CMD_I2C * I2C serial bus support
CONFIG_CMD_IDE * IDE harddisk support
CONFIG_CMD_IMI iminfo
CONFIG_CMD_IMLS List all images found in NOR flash
CONFIG_CMD_IMLS_NAND * List all images found in NAND flash
CONFIG_CMD_IMMAP * IMMR dump support
CONFIG_CMD_IOTRACE * I/O tracing for debugging
CONFIG_CMD_IMPORTENV * import an environment
CONFIG_CMD_INI * import data from an ini file into the env
CONFIG_CMD_IRQ * irqinfo
CONFIG_CMD_ITEST Integer/string test of 2 values
CONFIG_CMD_JFFS2 * JFFS2 Support
CONFIG_CMD_KGDB * kgdb
CONFIG_CMD_LDRINFO * ldrinfo (display Blackfin loader)
CONFIG_CMD_LINK_LOCAL * link-local IP address auto-configuration
(169.254.*.*)
CONFIG_CMD_LOADB loadb
CONFIG_CMD_LOADS loads
CONFIG_CMD_MD5SUM * print md5 message digest
(requires CONFIG_CMD_MEMORY and CONFIG_MD5)
CONFIG_CMD_MEMINFO * Display detailed memory information
CONFIG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base,
loop, loopw
CONFIG_CMD_MEMTEST * mtest
CONFIG_CMD_MISC Misc functions like sleep etc
CONFIG_CMD_MMC * MMC memory mapped support
CONFIG_CMD_MII * MII utility commands
CONFIG_CMD_MTDPARTS * MTD partition support
CONFIG_CMD_NAND * NAND support
CONFIG_CMD_NET bootp, tftpboot, rarpboot
CONFIG_CMD_NFS NFS support
CONFIG_CMD_PCA953X * PCA953x I2C gpio commands
CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
CONFIG_CMD_PCI * pciinfo
CONFIG_CMD_PCMCIA * PCMCIA support
CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network
host
CONFIG_CMD_PORTIO * Port I/O
CONFIG_CMD_READ * Read raw data from partition
CONFIG_CMD_REGINFO * Register dump
CONFIG_CMD_RUN run command in env variable
CONFIG_CMD_SANDBOX * sb command to access sandbox features
CONFIG_CMD_SAVES * save S record dump
CONFIG_CMD_SCSI * SCSI Support
CONFIG_CMD_SDRAM * print SDRAM configuration information
(requires CONFIG_CMD_I2C)
CONFIG_CMD_SETGETDCR Support for DCR Register access
(4xx only)
CONFIG_CMD_SF * Read/write/erase SPI NOR flash
CONFIG_CMD_SHA1SUM * print sha1 memory digest
(requires CONFIG_CMD_MEMORY)
CONFIG_CMD_SOFTSWITCH * Soft switch setting command for BF60x
CONFIG_CMD_SOURCE "source" command Support
CONFIG_CMD_SPI * SPI serial bus support
CONFIG_CMD_TFTPSRV * TFTP transfer in server mode
CONFIG_CMD_TFTPPUT * TFTP put command (upload)
CONFIG_CMD_TIME * run command and report execution time (ARM specific)
CONFIG_CMD_TIMER * access to the system tick timer
CONFIG_CMD_USB * USB support
CONFIG_CMD_CDP * Cisco Discover Protocol support
CONFIG_CMD_MFSL * Microblaze FSL support
CONFIG_CMD_XIMG Load part of Multi Image
CONFIG_CMD_UUID * Generate random UUID or GUID string
EXAMPLE: If you want all functions except of network
support you can write:
#include "config_cmd_all.h"
#undef CONFIG_CMD_NET
Other Commands:
fdt (flattened device tree) command: CONFIG_OF_LIBFDT
Note: Don't enable the "icache" and "dcache" commands
(configuration option CONFIG_CMD_CACHE) unless you know
what you (and your U-Boot users) are doing. Data
cache cannot be enabled on systems like the 8xx or
8260 (where accesses to the IMMR region must be
uncached), and it cannot be disabled on all other
systems where we (mis-) use the data cache to hold an
initial stack and some data.
XXX - this list needs to get updated!
- Regular expression support:
CONFIG_REGEX
If this variable is defined, U-Boot is linked against
the SLRE (Super Light Regular Expression) library,
which adds regex support to some commands, as for
example "env grep" and "setexpr".
- Device tree:
CONFIG_OF_CONTROL
If this variable is defined, U-Boot will use a device tree
to configure its devices, instead of relying on statically
compiled #defines in the board file. This option is
experimental and only available on a few boards. The device
tree is available in the global data as gd->fdt_blob.
U-Boot needs to get its device tree from somewhere. This can
be done using one of the two options below:
CONFIG_OF_EMBED
If this variable is defined, U-Boot will embed a device tree
binary in its image. This device tree file should be in the
board directory and called <soc>-<board>.dts. The binary file
is then picked up in board_init_f() and made available through
the global data structure as gd->blob.
CONFIG_OF_SEPARATE
If this variable is defined, U-Boot will build a device tree
binary. It will be called u-boot.dtb. Architecture-specific
code will locate it at run-time. Generally this works by:
cat u-boot.bin u-boot.dtb >image.bin
and in fact, U-Boot does this for you, creating a file called
u-boot-dtb.bin which is useful in the common case. You can
still use the individual files if you need something more
exotic.
- Watchdog:
CONFIG_WATCHDOG
If this variable is defined, it enables watchdog
support for the SoC. There must be support in the SoC
specific code for a watchdog. For the 8xx and 8260
CPUs, the SIU Watchdog feature is enabled in the SYPCR
register. When supported for a specific SoC is
available, then no further board specific code should
be needed to use it.
CONFIG_HW_WATCHDOG
When using a watchdog circuitry external to the used
SoC, then define this variable and provide board
specific code for the "hw_watchdog_reset" function.
CONFIG_AT91_HW_WDT_TIMEOUT
specify the timeout in seconds. default 2 seconds.
- U-Boot Version:
CONFIG_VERSION_VARIABLE
If this variable is defined, an environment variable
named "ver" is created by U-Boot showing the U-Boot
version as printed by the "version" command.
Any change to this variable will be reverted at the
next reset.
- Real-Time Clock:
When CONFIG_CMD_DATE is selected, the type of the RTC
has to be selected, too. Define exactly one of the
following options:
CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx
CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC
CONFIG_RTC_MC13XXX - use MC13783 or MC13892 RTC
CONFIG_RTC_MC146818 - use MC146818 RTC
CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC
CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC
CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC
CONFIG_RTC_DS1339 - use Maxim, Inc. DS1339 RTC
CONFIG_RTC_DS164x - use Dallas DS164x RTC
CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC
CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC
CONFIG_SYS_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337
CONFIG_SYS_RV3029_TCR - enable trickle charger on
RV3029 RTC.
Note that if the RTC uses I2C, then the I2C interface
must also be configured. See I2C Support, below.
- GPIO Support:
CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO
The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
chip-ngpio pairs that tell the PCA953X driver the number of
pins supported by a particular chip.
Note that if the GPIO device uses I2C, then the I2C interface
must also be configured. See I2C Support, below.
- I/O tracing:
When CONFIG_IO_TRACE is selected, U-Boot intercepts all I/O
accesses and can checksum them or write a list of them out
to memory. See the 'iotrace' command for details. This is
useful for testing device drivers since it can confirm that
the driver behaves the same way before and after a code
change. Currently this is supported on sandbox and arm. To
add support for your architecture, add '#include <iotrace.h>'
to the bottom of arch/<arch>/include/asm/io.h and test.
Example output from the 'iotrace stats' command is below.
Note that if the trace buffer is exhausted, the checksum will
still continue to operate.
iotrace is enabled
Start: 10000000 (buffer start address)
Size: 00010000 (buffer size)
Offset: 00000120 (current buffer offset)
Output: 10000120 (start + offset)
Count: 00000018 (number of trace records)
CRC32: 9526fb66 (CRC32 of all trace records)
- Timestamp Support:
When CONFIG_TIMESTAMP is selected, the timestamp
(date and time) of an image is printed by image
commands like bootm or iminfo. This option is
automatically enabled when you select CONFIG_CMD_DATE .
- Partition Labels (disklabels) Supported:
Zero or more of the following:
CONFIG_MAC_PARTITION Apple's MacOS partition table.
CONFIG_DOS_PARTITION MS Dos partition table, traditional on the
Intel architecture, USB sticks, etc.
CONFIG_ISO_PARTITION ISO partition table, used on CDROM etc.
CONFIG_EFI_PARTITION GPT partition table, common when EFI is the
bootloader. Note 2TB partition limit; see
disk/part_efi.c
CONFIG_MTD_PARTITIONS Memory Technology Device partition table.
If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
CONFIG_CMD_SCSI) you must configure support for at
least one non-MTD partition type as well.
- IDE Reset method:
CONFIG_IDE_RESET_ROUTINE - this is defined in several
board configurations files but used nowhere!
CONFIG_IDE_RESET - is this is defined, IDE Reset will
be performed by calling the function
ide_set_reset(int reset)
which has to be defined in a board specific file
- ATAPI Support:
CONFIG_ATAPI
Set this to enable ATAPI support.
- LBA48 Support
CONFIG_LBA48
Set this to enable support for disks larger than 137GB
Also look at CONFIG_SYS_64BIT_LBA.
Whithout these , LBA48 support uses 32bit variables and will 'only'
support disks up to 2.1TB.
CONFIG_SYS_64BIT_LBA:
When enabled, makes the IDE subsystem use 64bit sector addresses.
Default is 32bit.
- SCSI Support:
At the moment only there is only support for the
SYM53C8XX SCSI controller; define
CONFIG_SCSI_SYM53C8XX to enable it.
CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
maximum numbers of LUNs, SCSI ID's and target
devices.
CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
The environment variable 'scsidevs' is set to the number of
SCSI devices found during the last scan.
- NETWORK Support (PCI):
CONFIG_E1000
Support for Intel 8254x/8257x gigabit chips.
CONFIG_E1000_SPI
Utility code for direct access to the SPI bus on Intel 8257x.
This does not do anything useful unless you set at least one
of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC.
CONFIG_E1000_SPI_GENERIC
Allow generic access to the SPI bus on the Intel 8257x, for
example with the "sspi" command.
CONFIG_CMD_E1000
Management command for E1000 devices. When used on devices
with SPI support you can reprogram the EEPROM from U-Boot.
CONFIG_E1000_FALLBACK_MAC
default MAC for empty EEPROM after production.
CONFIG_EEPRO100
Support for Intel 82557/82559/82559ER chips.
Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
write routine for first time initialisation.
CONFIG_TULIP
Support for Digital 2114x chips.
Optional CONFIG_TULIP_SELECT_MEDIA for board specific
modem chip initialisation (KS8761/QS6611).
CONFIG_NATSEMI
Support for National dp83815 chips.
CONFIG_NS8382X
Support for National dp8382[01] gigabit chips.
- NETWORK Support (other):
CONFIG_DRIVER_AT91EMAC
Support for AT91RM9200 EMAC.
CONFIG_RMII
Define this to use reduced MII inteface
CONFIG_DRIVER_AT91EMAC_QUIET
If this defined, the driver is quiet.
The driver doen't show link status messages.
CONFIG_CALXEDA_XGMAC
Support for the Calxeda XGMAC device
CONFIG_LAN91C96
Support for SMSC's LAN91C96 chips.
CONFIG_LAN91C96_BASE
Define this to hold the physical address
of the LAN91C96's I/O space
CONFIG_LAN91C96_USE_32_BIT
Define this to enable 32 bit addressing
CONFIG_SMC91111
Support for SMSC's LAN91C111 chip
CONFIG_SMC91111_BASE
Define this to hold the physical address
of the device (I/O space)
CONFIG_SMC_USE_32_BIT
Define this if data bus is 32 bits
CONFIG_SMC_USE_IOFUNCS
Define this to use i/o functions instead of macros
(some hardware wont work with macros)
CONFIG_DRIVER_TI_EMAC
Support for davinci emac
CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT
Define this if you have more then 3 PHYs.
CONFIG_FTGMAC100
Support for Faraday's FTGMAC100 Gigabit SoC Ethernet
CONFIG_FTGMAC100_EGIGA
Define this to use GE link update with gigabit PHY.
Define this if FTGMAC100 is connected to gigabit PHY.
If your system has 10/100 PHY only, it might not occur
wrong behavior. Because PHY usually return timeout or
useless data when polling gigabit status and gigabit
control registers. This behavior won't affect the
correctnessof 10/100 link speed update.
CONFIG_SMC911X
Support for SMSC's LAN911x and LAN921x chips
CONFIG_SMC911X_BASE
Define this to hold the physical address
of the device (I/O space)
CONFIG_SMC911X_32_BIT
Define this if data bus is 32 bits
CONFIG_SMC911X_16_BIT
Define this if data bus is 16 bits. If your processor
automatically converts one 32 bit word to two 16 bit
words you may also try CONFIG_SMC911X_32_BIT.
CONFIG_SH_ETHER
Support for Renesas on-chip Ethernet controller
CONFIG_SH_ETHER_USE_PORT
Define the number of ports to be used
CONFIG_SH_ETHER_PHY_ADDR
Define the ETH PHY's address
CONFIG_SH_ETHER_CACHE_WRITEBACK
If this option is set, the driver enables cache flush.
- PWM Support:
CONFIG_PWM_IMX
Support for PWM modul on the imx6.
- TPM Support:
CONFIG_TPM
Support TPM devices.
CONFIG_TPM_TIS_I2C
Support for i2c bus TPM devices. Only one device
per system is supported at this time.
CONFIG_TPM_TIS_I2C_BUS_NUMBER
Define the the i2c bus number for the TPM device
CONFIG_TPM_TIS_I2C_SLAVE_ADDRESS
Define the TPM's address on the i2c bus
CONFIG_TPM_TIS_I2C_BURST_LIMITATION
Define the burst count bytes upper limit
CONFIG_TPM_ATMEL_TWI
Support for Atmel TWI TPM device. Requires I2C support.
CONFIG_TPM_TIS_LPC
Support for generic parallel port TPM devices. Only one device
per system is supported at this time.
CONFIG_TPM_TIS_BASE_ADDRESS
Base address where the generic TPM device is mapped
to. Contemporary x86 systems usually map it at
0xfed40000.
CONFIG_CMD_TPM
Add tpm monitor functions.
Requires CONFIG_TPM. If CONFIG_TPM_AUTH_SESSIONS is set, also
provides monitor access to authorized functions.
CONFIG_TPM
Define this to enable the TPM support library which provides
functional interfaces to some TPM commands.
Requires support for a TPM device.
CONFIG_TPM_AUTH_SESSIONS
Define this to enable authorized functions in the TPM library.
Requires CONFIG_TPM and CONFIG_SHA1.
- USB Support:
At the moment only the UHCI host controller is
supported (PIP405, MIP405, MPC5200); define
CONFIG_USB_UHCI to enable it.
define CONFIG_USB_KEYBOARD to enable the USB Keyboard
and define CONFIG_USB_STORAGE to enable the USB
storage devices.
Note:
Supported are USB Keyboards and USB Floppy drives
(TEAC FD-05PUB).
MPC5200 USB requires additional defines:
CONFIG_USB_CLOCK
for 528 MHz Clock: 0x0001bbbb
CONFIG_PSC3_USB
for USB on PSC3
CONFIG_USB_CONFIG
for differential drivers: 0x00001000
for single ended drivers: 0x00005000
for differential drivers on PSC3: 0x00000100
for single ended drivers on PSC3: 0x00004100
CONFIG_SYS_USB_EVENT_POLL
May be defined to allow interrupt polling
instead of using asynchronous interrupts
CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the
txfilltuning field in the EHCI controller on reset.
CONFIG_USB_DWC2_REG_ADDR the physical CPU address of the DWC2
HW module registers.
- USB Device:
Define the below if you wish to use the USB console.
Once firmware is rebuilt from a serial console issue the
command "setenv stdin usbtty; setenv stdout usbtty" and
attach your USB cable. The Unix command "dmesg" should print
it has found a new device. The environment variable usbtty
can be set to gserial or cdc_acm to enable your device to
appear to a USB host as a Linux gserial device or a
Common Device Class Abstract Control Model serial device.
If you select usbtty = gserial you should be able to enumerate
a Linux host by
# modprobe usbserial vendor=0xVendorID product=0xProductID
else if using cdc_acm, simply setting the environment
variable usbtty to be cdc_acm should suffice. The following
might be defined in YourBoardName.h
CONFIG_USB_DEVICE
Define this to build a UDC device
CONFIG_USB_TTY
Define this to have a tty type of device available to
talk to the UDC device
CONFIG_USBD_HS
Define this to enable the high speed support for usb
device and usbtty. If this feature is enabled, a routine
int is_usbd_high_speed(void)
also needs to be defined by the driver to dynamically poll
whether the enumeration has succeded at high speed or full
speed.
CONFIG_SYS_CONSOLE_IS_IN_ENV
Define this if you want stdin, stdout &/or stderr to
be set to usbtty.
mpc8xx:
CONFIG_SYS_USB_EXTC_CLK 0xBLAH
Derive USB clock from external clock "blah"
- CONFIG_SYS_USB_EXTC_CLK 0x02
CONFIG_SYS_USB_BRG_CLK 0xBLAH
Derive USB clock from brgclk
- CONFIG_SYS_USB_BRG_CLK 0x04
If you have a USB-IF assigned VendorID then you may wish to
define your own vendor specific values either in BoardName.h
or directly in usbd_vendor_info.h. If you don't define
CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
should pretend to be a Linux device to it's target host.
CONFIG_USBD_MANUFACTURER
Define this string as the name of your company for
- CONFIG_USBD_MANUFACTURER "my company"
CONFIG_USBD_PRODUCT_NAME
Define this string as the name of your product
- CONFIG_USBD_PRODUCT_NAME "acme usb device"
CONFIG_USBD_VENDORID
Define this as your assigned Vendor ID from the USB
Implementors Forum. This *must* be a genuine Vendor ID
to avoid polluting the USB namespace.
- CONFIG_USBD_VENDORID 0xFFFF
CONFIG_USBD_PRODUCTID
Define this as the unique Product ID
for your device
- CONFIG_USBD_PRODUCTID 0xFFFF
- ULPI Layer Support:
The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via
the generic ULPI layer. The generic layer accesses the ULPI PHY
via the platform viewport, so you need both the genric layer and
the viewport enabled. Currently only Chipidea/ARC based
viewport is supported.
To enable the ULPI layer support, define CONFIG_USB_ULPI and
CONFIG_USB_ULPI_VIEWPORT in your board configuration file.
If your ULPI phy needs a different reference clock than the
standard 24 MHz then you have to define CONFIG_ULPI_REF_CLK to
the appropriate value in Hz.
- MMC Support:
The MMC controller on the Intel PXA is supported. To
enable this define CONFIG_MMC. The MMC can be
accessed from the boot prompt by mapping the device
to physical memory similar to flash. Command line is
enabled with CONFIG_CMD_MMC. The MMC driver also works with
the FAT fs. This is enabled with CONFIG_CMD_FAT.
CONFIG_SH_MMCIF
Support for Renesas on-chip MMCIF controller
CONFIG_SH_MMCIF_ADDR
Define the base address of MMCIF registers
CONFIG_SH_MMCIF_CLK
Define the clock frequency for MMCIF
CONFIG_GENERIC_MMC
Enable the generic MMC driver
CONFIG_SUPPORT_EMMC_BOOT
Enable some additional features of the eMMC boot partitions.
CONFIG_SUPPORT_EMMC_RPMB
Enable the commands for reading, writing and programming the
key for the Replay Protection Memory Block partition in eMMC.
- USB Device Firmware Update (DFU) class support:
CONFIG_DFU_FUNCTION
This enables the USB portion of the DFU USB class
CONFIG_CMD_DFU
This enables the command "dfu" which is used to have
U-Boot create a DFU class device via USB. This command
requires that the "dfu_alt_info" environment variable be
set and define the alt settings to expose to the host.
CONFIG_DFU_MMC
This enables support for exposing (e)MMC devices via DFU.
CONFIG_DFU_NAND
This enables support for exposing NAND devices via DFU.
CONFIG_DFU_RAM
This enables support for exposing RAM via DFU.
Note: DFU spec refer to non-volatile memory usage, but
allow usages beyond the scope of spec - here RAM usage,
one that would help mostly the developer.
CONFIG_SYS_DFU_DATA_BUF_SIZE
Dfu transfer uses a buffer before writing data to the
raw storage device. Make the size (in bytes) of this buffer
configurable. The size of this buffer is also configurable
through the "dfu_bufsiz" environment variable.
CONFIG_SYS_DFU_MAX_FILE_SIZE
When updating files rather than the raw storage device,
we use a static buffer to copy the file into and then write
the buffer once we've been given the whole file. Define
this to the maximum filesize (in bytes) for the buffer.
Default is 4 MiB if undefined.
DFU_DEFAULT_POLL_TIMEOUT
Poll timeout [ms], is the timeout a device can send to the
host. The host must wait for this timeout before sending
a subsequent DFU_GET_STATUS request to the device.
DFU_MANIFEST_POLL_TIMEOUT
Poll timeout [ms], which the device sends to the host when
entering dfuMANIFEST state. Host waits this timeout, before
sending again an USB request to the device.
- USB Device Android Fastboot support:
CONFIG_CMD_FASTBOOT
This enables the command "fastboot" which enables the Android
fastboot mode for the platform's USB device. Fastboot is a USB
protocol for downloading images, flashing and device control
used on Android devices.
See doc/README.android-fastboot for more information.
CONFIG_ANDROID_BOOT_IMAGE
This enables support for booting images which use the Android
image format header.
CONFIG_USB_FASTBOOT_BUF_ADDR
The fastboot protocol requires a large memory buffer for
downloads. Define this to the starting RAM address to use for
downloaded images.
CONFIG_USB_FASTBOOT_BUF_SIZE
The fastboot protocol requires a large memory buffer for
downloads. This buffer should be as large as possible for a
platform. Define this to the size available RAM for fastboot.
CONFIG_FASTBOOT_FLASH
The fastboot protocol includes a "flash" command for writing
the downloaded image to a non-volatile storage device. Define
this to enable the "fastboot flash" command.
CONFIG_FASTBOOT_FLASH_MMC_DEV
The fastboot "flash" command requires additional information
regarding the non-volatile storage device. Define this to
the eMMC device that fastboot should use to store the image.
CONFIG_FASTBOOT_GPT_NAME
The fastboot "flash" command supports writing the downloaded
image to the Protective MBR and the Primary GUID Partition
Table. (Additionally, this downloaded image is post-processed
to generate and write the Backup GUID Partition Table.)
This occurs when the specified "partition name" on the
"fastboot flash" command line matches this value.
Default is GPT_ENTRY_NAME (currently "gpt") if undefined.
- Journaling Flash filesystem support:
CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
CONFIG_JFFS2_NAND_DEV
Define these for a default partition on a NAND device
CONFIG_SYS_JFFS2_FIRST_SECTOR,
CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
Define these for a default partition on a NOR device
CONFIG_SYS_JFFS_CUSTOM_PART
Define this to create an own partition. You have to provide a
function struct part_info* jffs2_part_info(int part_num)
If you define only one JFFS2 partition you may also want to
#define CONFIG_SYS_JFFS_SINGLE_PART 1
to disable the command chpart. This is the default when you
have not defined a custom partition
- FAT(File Allocation Table) filesystem write function support:
CONFIG_FAT_WRITE
Define this to enable support for saving memory data as a
file in FAT formatted partition.
This will also enable the command "fatwrite" enabling the
user to write files to FAT.
CBFS (Coreboot Filesystem) support
CONFIG_CMD_CBFS
Define this to enable support for reading from a Coreboot
filesystem. Available commands are cbfsinit, cbfsinfo, cbfsls
and cbfsload.
- FAT(File Allocation Table) filesystem cluster size:
CONFIG_FS_FAT_MAX_CLUSTSIZE
Define the max cluster size for fat operations else
a default value of 65536 will be defined.
- Keyboard Support:
CONFIG_ISA_KEYBOARD
Define this to enable standard (PC-Style) keyboard
support
CONFIG_I8042_KBD
Standard PC keyboard driver with US (is default) and
GERMAN key layout (switch via environment 'keymap=de') support.
Export function i8042_kbd_init, i8042_tstc and i8042_getc
for cfb_console. Supports cursor blinking.
CONFIG_CROS_EC_KEYB
Enables a Chrome OS keyboard using the CROS_EC interface.
This uses CROS_EC to communicate with a second microcontroller
which provides key scans on request.
- Video support:
CONFIG_VIDEO
Define this to enable video support (for output to
video).
CONFIG_VIDEO_CT69000
Enable Chips & Technologies 69000 Video chip
CONFIG_VIDEO_SMI_LYNXEM
Enable Silicon Motion SMI 712/710/810 Video chip. The
video output is selected via environment 'videoout'
(1 = LCD and 2 = CRT). If videoout is undefined, CRT is
assumed.
For the CT69000 and SMI_LYNXEM drivers, videomode is
selected via environment 'videomode'. Two different ways
are possible:
- "videomode=num" 'num' is a standard LiLo mode numbers.
Following standard modes are supported (* is default):
Colors 640x480 800x600 1024x768 1152x864 1280x1024
-------------+---------------------------------------------
8 bits | 0x301* 0x303 0x305 0x161 0x307
15 bits | 0x310 0x313 0x316 0x162 0x319
16 bits | 0x311 0x314 0x317 0x163 0x31A
24 bits | 0x312 0x315 0x318 ? 0x31B
-------------+---------------------------------------------
(i.e. setenv videomode 317; saveenv; reset;)
- "videomode=bootargs" all the video parameters are parsed
from the bootargs. (See drivers/video/videomodes.c)
CONFIG_VIDEO_SED13806
Enable Epson SED13806 driver. This driver supports 8bpp
and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
or CONFIG_VIDEO_SED13806_16BPP
CONFIG_FSL_DIU_FB
Enable the Freescale DIU video driver. Reference boards for
SOCs that have a DIU should define this macro to enable DIU
support, and should also define these other macros:
CONFIG_SYS_DIU_ADDR
CONFIG_VIDEO
CONFIG_CMD_BMP
CONFIG_CFB_CONSOLE
CONFIG_VIDEO_SW_CURSOR
CONFIG_VGA_AS_SINGLE_DEVICE
CONFIG_VIDEO_LOGO
CONFIG_VIDEO_BMP_LOGO
The DIU driver will look for the 'video-mode' environment
variable, and if defined, enable the DIU as a console during
boot. See the documentation file README.video for a
description of this variable.
CONFIG_VIDEO_VGA
Enable the VGA video / BIOS for x86. The alternative if you
are using coreboot is to use the coreboot frame buffer
driver.
- Keyboard Support:
CONFIG_KEYBOARD
Define this to enable a custom keyboard support.
This simply calls drv_keyboard_init() which must be
defined in your board-specific files.
The only board using this so far is RBC823.
- LCD Support: CONFIG_LCD
Define this to enable LCD support (for output to LCD
display); also select one of the supported displays
by defining one of these:
CONFIG_ATMEL_LCD:
HITACHI TX09D70VM1CCA, 3.5", 240x320.
CONFIG_NEC_NL6448AC33:
NEC NL6448AC33-18. Active, color, single scan.
CONFIG_NEC_NL6448BC20
NEC NL6448BC20-08. 6.5", 640x480.
Active, color, single scan.
CONFIG_NEC_NL6448BC33_54
NEC NL6448BC33-54. 10.4", 640x480.
Active, color, single scan.
CONFIG_SHARP_16x9
Sharp 320x240. Active, color, single scan.
It isn't 16x9, and I am not sure what it is.
CONFIG_SHARP_LQ64D341
Sharp LQ64D341 display, 640x480.
Active, color, single scan.
CONFIG_HLD1045
HLD1045 display, 640x480.
Active, color, single scan.
CONFIG_OPTREX_BW
Optrex CBL50840-2 NF-FW 99 22 M5
or
Hitachi LMG6912RPFC-00T
or
Hitachi SP14Q002
320x240. Black & white.
Normally display is black on white background; define
CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
CONFIG_LCD_ALIGNMENT
Normally the LCD is page-aligned (typically 4KB). If this is
defined then the LCD will be aligned to this value instead.
For ARM it is sometimes useful to use MMU_SECTION_SIZE
here, since it is cheaper to change data cache settings on
a per-section basis.
CONFIG_CONSOLE_SCROLL_LINES
When the console need to be scrolled, this is the number of
lines to scroll by. It defaults to 1. Increasing this makes
the console jump but can help speed up operation when scrolling
is slow.
CONFIG_LCD_BMP_RLE8
Support drawing of RLE8-compressed bitmaps on the LCD.
CONFIG_I2C_EDID
Enables an 'i2c edid' command which can read EDID
information over I2C from an attached LCD display.
- Splash Screen Support: CONFIG_SPLASH_SCREEN
If this option is set, the environment is checked for
a variable "splashimage". If found, the usual display
of logo, copyright and system information on the LCD
is suppressed and the BMP image at the address
specified in "splashimage" is loaded instead. The
console is redirected to the "nulldev", too. This
allows for a "silent" boot where a splash screen is
loaded very quickly after power-on.
CONFIG_SPLASHIMAGE_GUARD
If this option is set, then U-Boot will prevent the environment
variable "splashimage" from being set to a problematic address
(see README.displaying-bmps).
This option is useful for targets where, due to alignment
restrictions, an improperly aligned BMP image will cause a data
abort. If you think you will not have problems with unaligned
accesses (for example because your toolchain prevents them)
there is no need to set this option.
CONFIG_SPLASH_SCREEN_ALIGN
If this option is set the splash image can be freely positioned
on the screen. Environment variable "splashpos" specifies the
position as "x,y". If a positive number is given it is used as
number of pixel from left/top. If a negative number is given it
is used as number of pixel from right/bottom. You can also
specify 'm' for centering the image.
Example:
setenv splashpos m,m
=> image at center of screen
setenv splashpos 30,20
=> image at x = 30 and y = 20
setenv splashpos -10,m
=> vertically centered image
at x = dspWidth - bmpWidth - 9
- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
If this option is set, additionally to standard BMP
images, gzipped BMP images can be displayed via the
splashscreen support or the bmp command.
- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
If this option is set, 8-bit RLE compressed BMP images
can be displayed via the splashscreen support or the
bmp command.
- Do compressing for memory range:
CONFIG_CMD_ZIP
If this option is set, it would use zlib deflate method
to compress the specified memory at its best effort.
- Compression support:
CONFIG_GZIP
Enabled by default to support gzip compressed images.
CONFIG_BZIP2
If this option is set, support for bzip2 compressed
images is included. If not, only uncompressed and gzip
compressed images are supported.
NOTE: the bzip2 algorithm requires a lot of RAM, so
the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
be at least 4MB.
CONFIG_LZMA
If this option is set, support for lzma compressed
images is included.
Note: The LZMA algorithm adds between 2 and 4KB of code and it
requires an amount of dynamic memory that is given by the
formula:
(1846 + 768 << (lc + lp)) * sizeof(uint16)
Where lc and lp stand for, respectively, Literal context bits
and Literal pos bits.
This value is upper-bounded by 14MB in the worst case. Anyway,
for a ~4MB large kernel image, we have lc=3 and lp=0 for a
total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
a very small buffer.
Use the lzmainfo tool to determinate the lc and lp values and
then calculate the amount of needed dynamic memory (ensuring
the appropriate CONFIG_SYS_MALLOC_LEN value).
CONFIG_LZO
If this option is set, support for LZO compressed images
is included.
- MII/PHY support:
CONFIG_PHY_ADDR
The address of PHY on MII bus.
CONFIG_PHY_CLOCK_FREQ (ppc4xx)
The clock frequency of the MII bus
CONFIG_PHY_GIGE
If this option is set, support for speed/duplex
detection of gigabit PHY is included.
CONFIG_PHY_RESET_DELAY
Some PHY like Intel LXT971A need extra delay after
reset before any MII register access is possible.
For such PHY, set this option to the usec delay
required. (minimum 300usec for LXT971A)
CONFIG_PHY_CMD_DELAY (ppc4xx)
Some PHY like Intel LXT971A need extra delay after
command issued before MII status register can be read
- Ethernet address:
CONFIG_ETHADDR
CONFIG_ETH1ADDR
CONFIG_ETH2ADDR
CONFIG_ETH3ADDR
CONFIG_ETH4ADDR
CONFIG_ETH5ADDR
Define a default value for Ethernet address to use
for the respective Ethernet interface, in case this
is not determined automatically.
- IP address:
CONFIG_IPADDR
Define a default value for the IP address to use for
the default Ethernet interface, in case this is not
determined through e.g. bootp.
(Environment variable "ipaddr")
- Server IP address:
CONFIG_SERVERIP
Defines a default value for the IP address of a TFTP
server to contact when using the "tftboot" command.
(Environment variable "serverip")
CONFIG_KEEP_SERVERADDR
Keeps the server's MAC address, in the env 'serveraddr'
for passing to bootargs (like Linux's netconsole option)
- Gateway IP address:
CONFIG_GATEWAYIP
Defines a default value for the IP address of the
default router where packets to other networks are
sent to.
(Environment variable "gatewayip")
- Subnet mask:
CONFIG_NETMASK
Defines a default value for the subnet mask (or
routing prefix) which is used to determine if an IP
address belongs to the local subnet or needs to be
forwarded through a router.
(Environment variable "netmask")
- Multicast TFTP Mode:
CONFIG_MCAST_TFTP
Defines whether you want to support multicast TFTP as per
rfc-2090; for example to work with atftp. Lets lots of targets
tftp down the same boot image concurrently. Note: the Ethernet
driver in use must provide a function: mcast() to join/leave a
multicast group.
- BOOTP Recovery Mode:
CONFIG_BOOTP_RANDOM_DELAY
If you have many targets in a network that try to
boot using BOOTP, you may want to avoid that all
systems send out BOOTP requests at precisely the same
moment (which would happen for instance at recovery
from a power failure, when all systems will try to
boot, thus flooding the BOOTP server. Defining
CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
inserted before sending out BOOTP requests. The
following delays are inserted then:
1st BOOTP request: delay 0 ... 1 sec
2nd BOOTP request: delay 0 ... 2 sec
3rd BOOTP request: delay 0 ... 4 sec
4th and following
BOOTP requests: delay 0 ... 8 sec
CONFIG_BOOTP_ID_CACHE_SIZE
BOOTP packets are uniquely identified using a 32-bit ID. The
server will copy the ID from client requests to responses and
U-Boot will use this to determine if it is the destination of
an incoming response. Some servers will check that addresses
aren't in use before handing them out (usually using an ARP
ping) and therefore take up to a few hundred milliseconds to
respond. Network congestion may also influence the time it
takes for a response to make it back to the client. If that
time is too long, U-Boot will retransmit requests. In order
to allow earlier responses to still be accepted after these
retransmissions, U-Boot's BOOTP client keeps a small cache of
IDs. The CONFIG_BOOTP_ID_CACHE_SIZE controls the size of this
cache. The default is to keep IDs for up to four outstanding
requests. Increasing this will allow U-Boot to accept offers
from a BOOTP client in networks with unusually high latency.
- DHCP Advanced Options:
You can fine tune the DHCP functionality by defining
CONFIG_BOOTP_* symbols:
CONFIG_BOOTP_SUBNETMASK
CONFIG_BOOTP_GATEWAY
CONFIG_BOOTP_HOSTNAME
CONFIG_BOOTP_NISDOMAIN
CONFIG_BOOTP_BOOTPATH
CONFIG_BOOTP_BOOTFILESIZE
CONFIG_BOOTP_DNS
CONFIG_BOOTP_DNS2
CONFIG_BOOTP_SEND_HOSTNAME
CONFIG_BOOTP_NTPSERVER
CONFIG_BOOTP_TIMEOFFSET
CONFIG_BOOTP_VENDOREX
CONFIG_BOOTP_MAY_FAIL
CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
environment variable, not the BOOTP server.
CONFIG_BOOTP_MAY_FAIL - If the DHCP server is not found
after the configured retry count, the call will fail
instead of starting over. This can be used to fail over
to Link-local IP address configuration if the DHCP server
is not available.
CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
serverip from a DHCP server, it is possible that more
than one DNS serverip is offered to the client.
If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
serverip will be stored in the additional environment
variable "dnsip2". The first DNS serverip is always
stored in the variable "dnsip", when CONFIG_BOOTP_DNS
is defined.
CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
to do a dynamic update of a DNS server. To do this, they
need the hostname of the DHCP requester.
If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
of the "hostname" environment variable is passed as
option 12 to the DHCP server.
CONFIG_BOOTP_DHCP_REQUEST_DELAY
A 32bit value in microseconds for a delay between
receiving a "DHCP Offer" and sending the "DHCP Request".
This fixes a problem with certain DHCP servers that don't
respond 100% of the time to a "DHCP request". E.g. On an
AT91RM9200 processor running at 180MHz, this delay needed
to be *at least* 15,000 usec before a Windows Server 2003
DHCP server would reply 100% of the time. I recommend at
least 50,000 usec to be safe. The alternative is to hope
that one of the retries will be successful but note that
the DHCP timeout and retry process takes a longer than
this delay.
- Link-local IP address negotiation:
Negotiate with other link-local clients on the local network
for an address that doesn't require explicit configuration.
This is especially useful if a DHCP server cannot be guaranteed
to exist in all environments that the device must operate.
See doc/README.link-local for more information.
- CDP Options:
CONFIG_CDP_DEVICE_ID
The device id used in CDP trigger frames.
CONFIG_CDP_DEVICE_ID_PREFIX
A two character string which is prefixed to the MAC address
of the device.
CONFIG_CDP_PORT_ID
A printf format string which contains the ascii name of
the port. Normally is set to "eth%d" which sets
eth0 for the first Ethernet, eth1 for the second etc.
CONFIG_CDP_CAPABILITIES
A 32bit integer which indicates the device capabilities;
0x00000010 for a normal host which does not forwards.
CONFIG_CDP_VERSION
An ascii string containing the version of the software.
CONFIG_CDP_PLATFORM
An ascii string containing the name of the platform.
CONFIG_CDP_TRIGGER
A 32bit integer sent on the trigger.
CONFIG_CDP_POWER_CONSUMPTION
A 16bit integer containing the power consumption of the
device in .1 of milliwatts.
CONFIG_CDP_APPLIANCE_VLAN_TYPE
A byte containing the id of the VLAN.
- Status LED: CONFIG_STATUS_LED
Several configurations allow to display the current
status using a LED. For instance, the LED will blink
fast while running U-Boot code, stop blinking as
soon as a reply to a BOOTP request was received, and
start blinking slow once the Linux kernel is running
(supported by a status LED driver in the Linux
kernel). Defining CONFIG_STATUS_LED enables this
feature in U-Boot.
Additional options:
CONFIG_GPIO_LED
The status LED can be connected to a GPIO pin.
In such cases, the gpio_led driver can be used as a
status LED backend implementation. Define CONFIG_GPIO_LED
to include the gpio_led driver in the U-Boot binary.
CONFIG_GPIO_LED_INVERTED_TABLE
Some GPIO connected LEDs may have inverted polarity in which
case the GPIO high value corresponds to LED off state and
GPIO low value corresponds to LED on state.
In such cases CONFIG_GPIO_LED_INVERTED_TABLE may be defined
with a list of GPIO LEDs that have inverted polarity.
- CAN Support: CONFIG_CAN_DRIVER
Defining CONFIG_CAN_DRIVER enables CAN driver support
on those systems that support this (optional)
feature, like the TQM8xxL modules.
- I2C Support: CONFIG_SYS_I2C
This enable the NEW i2c subsystem, and will allow you to use
i2c commands at the u-boot command line (as long as you set
CONFIG_CMD_I2C in CONFIG_COMMANDS) and communicate with i2c
based realtime clock chips or other i2c devices. See
common/cmd_i2c.c for a description of the command line
interface.
ported i2c driver to the new framework:
- drivers/i2c/soft_i2c.c:
- activate first bus with CONFIG_SYS_I2C_SOFT define
CONFIG_SYS_I2C_SOFT_SPEED and CONFIG_SYS_I2C_SOFT_SLAVE
for defining speed and slave address
- activate second bus with I2C_SOFT_DECLARATIONS2 define
CONFIG_SYS_I2C_SOFT_SPEED_2 and CONFIG_SYS_I2C_SOFT_SLAVE_2
for defining speed and slave address
- activate third bus with I2C_SOFT_DECLARATIONS3 define
CONFIG_SYS_I2C_SOFT_SPEED_3 and CONFIG_SYS_I2C_SOFT_SLAVE_3
for defining speed and slave address
- activate fourth bus with I2C_SOFT_DECLARATIONS4 define
CONFIG_SYS_I2C_SOFT_SPEED_4 and CONFIG_SYS_I2C_SOFT_SLAVE_4
for defining speed and slave address
- drivers/i2c/fsl_i2c.c:
- activate i2c driver with CONFIG_SYS_I2C_FSL
define CONFIG_SYS_FSL_I2C_OFFSET for setting the register
offset CONFIG_SYS_FSL_I2C_SPEED for the i2c speed and
CONFIG_SYS_FSL_I2C_SLAVE for the slave addr of the first
bus.
- If your board supports a second fsl i2c bus, define
CONFIG_SYS_FSL_I2C2_OFFSET for the register offset
CONFIG_SYS_FSL_I2C2_SPEED for the speed and
CONFIG_SYS_FSL_I2C2_SLAVE for the slave address of the
second bus.
- drivers/i2c/tegra_i2c.c:
- activate this driver with CONFIG_SYS_I2C_TEGRA
- This driver adds 4 i2c buses with a fix speed from
100000 and the slave addr 0!
- drivers/i2c/ppc4xx_i2c.c
- activate this driver with CONFIG_SYS_I2C_PPC4XX
- CONFIG_SYS_I2C_PPC4XX_CH0 activate hardware channel 0
- CONFIG_SYS_I2C_PPC4XX_CH1 activate hardware channel 1
- drivers/i2c/i2c_mxc.c
- activate this driver with CONFIG_SYS_I2C_MXC
- define speed for bus 1 with CONFIG_SYS_MXC_I2C1_SPEED
- define slave for bus 1 with CONFIG_SYS_MXC_I2C1_SLAVE
- define speed for bus 2 with CONFIG_SYS_MXC_I2C2_SPEED
- define slave for bus 2 with CONFIG_SYS_MXC_I2C2_SLAVE
- define speed for bus 3 with CONFIG_SYS_MXC_I2C3_SPEED
- define slave for bus 3 with CONFIG_SYS_MXC_I2C3_SLAVE
If those defines are not set, default value is 100000
for speed, and 0 for slave.
- drivers/i2c/rcar_i2c.c:
- activate this driver with CONFIG_SYS_I2C_RCAR
- This driver adds 4 i2c buses
- CONFIG_SYS_RCAR_I2C0_BASE for setting the register channel 0
- CONFIG_SYS_RCAR_I2C0_SPEED for for the speed channel 0
- CONFIG_SYS_RCAR_I2C1_BASE for setting the register channel 1
- CONFIG_SYS_RCAR_I2C1_SPEED for for the speed channel 1
- CONFIG_SYS_RCAR_I2C2_BASE for setting the register channel 2
- CONFIG_SYS_RCAR_I2C2_SPEED for for the speed channel 2
- CONFIG_SYS_RCAR_I2C3_BASE for setting the register channel 3
- CONFIG_SYS_RCAR_I2C3_SPEED for for the speed channel 3
- CONFIF_SYS_RCAR_I2C_NUM_CONTROLLERS for number of i2c buses
- drivers/i2c/sh_i2c.c:
- activate this driver with CONFIG_SYS_I2C_SH
- This driver adds from 2 to 5 i2c buses
- CONFIG_SYS_I2C_SH_BASE0 for setting the register channel 0
- CONFIG_SYS_I2C_SH_SPEED0 for for the speed channel 0
- CONFIG_SYS_I2C_SH_BASE1 for setting the register channel 1
- CONFIG_SYS_I2C_SH_SPEED1 for for the speed channel 1
- CONFIG_SYS_I2C_SH_BASE2 for setting the register channel 2
- CONFIG_SYS_I2C_SH_SPEED2 for for the speed channel 2
- CONFIG_SYS_I2C_SH_BASE3 for setting the register channel 3
- CONFIG_SYS_I2C_SH_SPEED3 for for the speed channel 3
- CONFIG_SYS_I2C_SH_BASE4 for setting the register channel 4
- CONFIG_SYS_I2C_SH_SPEED4 for for the speed channel 4
- CONFIG_SYS_I2C_SH_BASE5 for setting the register channel 5
- CONFIG_SYS_I2C_SH_SPEED5 for for the speed channel 5
- CONFIG_SYS_I2C_SH_NUM_CONTROLLERS for number of i2c buses
- drivers/i2c/omap24xx_i2c.c
- activate this driver with CONFIG_SYS_I2C_OMAP24XX
- CONFIG_SYS_OMAP24_I2C_SPEED speed channel 0
- CONFIG_SYS_OMAP24_I2C_SLAVE slave addr channel 0
- CONFIG_SYS_OMAP24_I2C_SPEED1 speed channel 1
- CONFIG_SYS_OMAP24_I2C_SLAVE1 slave addr channel 1
- CONFIG_SYS_OMAP24_I2C_SPEED2 speed channel 2
- CONFIG_SYS_OMAP24_I2C_SLAVE2 slave addr channel 2
- CONFIG_SYS_OMAP24_I2C_SPEED3 speed channel 3
- CONFIG_SYS_OMAP24_I2C_SLAVE3 slave addr channel 3
- CONFIG_SYS_OMAP24_I2C_SPEED4 speed channel 4
- CONFIG_SYS_OMAP24_I2C_SLAVE4 slave addr channel 4
- drivers/i2c/zynq_i2c.c
- activate this driver with CONFIG_SYS_I2C_ZYNQ
- set CONFIG_SYS_I2C_ZYNQ_SPEED for speed setting
- set CONFIG_SYS_I2C_ZYNQ_SLAVE for slave addr
- drivers/i2c/s3c24x0_i2c.c:
- activate this driver with CONFIG_SYS_I2C_S3C24X0
- This driver adds i2c buses (11 for Exynos5250, Exynos5420
9 i2c buses for Exynos4 and 1 for S3C24X0 SoCs from Samsung)
with a fix speed from 100000 and the slave addr 0!
- drivers/i2c/ihs_i2c.c
- activate this driver with CONFIG_SYS_I2C_IHS
- CONFIG_SYS_I2C_IHS_CH0 activate hardware channel 0
- CONFIG_SYS_I2C_IHS_SPEED_0 speed channel 0
- CONFIG_SYS_I2C_IHS_SLAVE_0 slave addr channel 0
- CONFIG_SYS_I2C_IHS_CH1 activate hardware channel 1
- CONFIG_SYS_I2C_IHS_SPEED_1 speed channel 1
- CONFIG_SYS_I2C_IHS_SLAVE_1 slave addr channel 1
- CONFIG_SYS_I2C_IHS_CH2 activate hardware channel 2
- CONFIG_SYS_I2C_IHS_SPEED_2 speed channel 2
- CONFIG_SYS_I2C_IHS_SLAVE_2 slave addr channel 2
- CONFIG_SYS_I2C_IHS_CH3 activate hardware channel 3
- CONFIG_SYS_I2C_IHS_SPEED_3 speed channel 3
- CONFIG_SYS_I2C_IHS_SLAVE_3 slave addr channel 3
additional defines:
CONFIG_SYS_NUM_I2C_BUSES
Hold the number of i2c buses you want to use. If you
don't use/have i2c muxes on your i2c bus, this
is equal to CONFIG_SYS_NUM_I2C_ADAPTERS, and you can
omit this define.
CONFIG_SYS_I2C_DIRECT_BUS
define this, if you don't use i2c muxes on your hardware.
if CONFIG_SYS_I2C_MAX_HOPS is not defined or == 0 you can
omit this define.
CONFIG_SYS_I2C_MAX_HOPS
define how many muxes are maximal consecutively connected
on one i2c bus. If you not use i2c muxes, omit this
define.
CONFIG_SYS_I2C_BUSES
hold a list of buses you want to use, only used if
CONFIG_SYS_I2C_DIRECT_BUS is not defined, for example
a board with CONFIG_SYS_I2C_MAX_HOPS = 1 and
CONFIG_SYS_NUM_I2C_BUSES = 9:
CONFIG_SYS_I2C_BUSES {{0, {I2C_NULL_HOP}}, \
{0, {{I2C_MUX_PCA9547, 0x70, 1}}}, \
{0, {{I2C_MUX_PCA9547, 0x70, 2}}}, \
{0, {{I2C_MUX_PCA9547, 0x70, 3}}}, \
{0, {{I2C_MUX_PCA9547, 0x70, 4}}}, \
{0, {{I2C_MUX_PCA9547, 0x70, 5}}}, \
{1, {I2C_NULL_HOP}}, \
{1, {{I2C_MUX_PCA9544, 0x72, 1}}}, \
{1, {{I2C_MUX_PCA9544, 0x72, 2}}}, \
}
which defines
bus 0 on adapter 0 without a mux
bus 1 on adapter 0 with a PCA9547 on address 0x70 port 1
bus 2 on adapter 0 with a PCA9547 on address 0x70 port 2
bus 3 on adapter 0 with a PCA9547 on address 0x70 port 3
bus 4 on adapter 0 with a PCA9547 on address 0x70 port 4
bus 5 on adapter 0 with a PCA9547 on address 0x70 port 5
bus 6 on adapter 1 without a mux
bus 7 on adapter 1 with a PCA9544 on address 0x72 port 1
bus 8 on adapter 1 with a PCA9544 on address 0x72 port 2
If you do not have i2c muxes on your board, omit this define.
- Legacy I2C Support: CONFIG_HARD_I2C
NOTE: It is intended to move drivers to CONFIG_SYS_I2C which
provides the following compelling advantages:
- more than one i2c adapter is usable
- approved multibus support
- better i2c mux support
** Please consider updating your I2C driver now. **
These enable legacy I2C serial bus commands. Defining
CONFIG_HARD_I2C will include the appropriate I2C driver
for the selected CPU.
This will allow you to use i2c commands at the u-boot
command line (as long as you set CONFIG_CMD_I2C in
CONFIG_COMMANDS) and communicate with i2c based realtime
clock chips. See common/cmd_i2c.c for a description of the
command line interface.
CONFIG_HARD_I2C selects a hardware I2C controller.
There are several other quantities that must also be
defined when you define CONFIG_HARD_I2C.
In both cases you will need to define CONFIG_SYS_I2C_SPEED
to be the frequency (in Hz) at which you wish your i2c bus
to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
the CPU's i2c node address).
Now, the u-boot i2c code for the mpc8xx
(arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
and so its address should therefore be cleared to 0 (See,
eg, MPC823e User's Manual p.16-473). So, set
CONFIG_SYS_I2C_SLAVE to 0.
CONFIG_SYS_I2C_INIT_MPC5XXX
When a board is reset during an i2c bus transfer
chips might think that the current transfer is still
in progress. Reset the slave devices by sending start
commands until the slave device responds.
That's all that's required for CONFIG_HARD_I2C.
If you use the software i2c interface (CONFIG_SYS_I2C_SOFT)
then the following macros need to be defined (examples are
from include/configs/lwmon.h):
I2C_INIT
(Optional). Any commands necessary to enable the I2C
controller or configure ports.
eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL)
I2C_PORT
(Only for MPC8260 CPU). The I/O port to use (the code
assumes both bits are on the same port). Valid values
are 0..3 for ports A..D.
I2C_ACTIVE
The code necessary to make the I2C data line active
(driven). If the data line is open collector, this
define can be null.
eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA)
I2C_TRISTATE
The code necessary to make the I2C data line tri-stated
(inactive). If the data line is open collector, this
define can be null.
eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
I2C_READ
Code that returns true if the I2C data line is high,
false if it is low.
eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
I2C_SDA(bit)
If <bit> is true, sets the I2C data line high. If it
is false, it clears it (low).
eg: #define I2C_SDA(bit) \
if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \
else immr->im_cpm.cp_pbdat &= ~PB_SDA
I2C_SCL(bit)
If <bit> is true, sets the I2C clock line high. If it
is false, it clears it (low).
eg: #define I2C_SCL(bit) \
if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \
else immr->im_cpm.cp_pbdat &= ~PB_SCL
I2C_DELAY
This delay is invoked four times per clock cycle so this
controls the rate of data transfer. The data rate thus
is 1 / (I2C_DELAY * 4). Often defined to be something
like:
#define I2C_DELAY udelay(2)
CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA
If your arch supports the generic GPIO framework (asm/gpio.h),
then you may alternatively define the two GPIOs that are to be
used as SCL / SDA. Any of the previous I2C_xxx macros will
have GPIO-based defaults assigned to them as appropriate.
You should define these to the GPIO value as given directly to
the generic GPIO functions.
CONFIG_SYS_I2C_INIT_BOARD
When a board is reset during an i2c bus transfer
chips might think that the current transfer is still
in progress. On some boards it is possible to access
the i2c SCLK line directly, either by using the
processor pin as a GPIO or by having a second pin
connected to the bus. If this option is defined a
custom i2c_init_board() routine in boards/xxx/board.c
is run early in the boot sequence.
CONFIG_SYS_I2C_BOARD_LATE_INIT
An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is
defined a custom i2c_board_late_init() routine in
boards/xxx/board.c is run AFTER the operations in i2c_init()
is completed. This callpoint can be used to unreset i2c bus
using CPU i2c controller register accesses for CPUs whose i2c
controller provide such a method. It is called at the end of
i2c_init() to allow i2c_init operations to setup the i2c bus
controller on the CPU (e.g. setting bus speed & slave address).
CONFIG_I2CFAST (PPC405GP|PPC405EP only)
This option enables configuration of bi_iic_fast[] flags
in u-boot bd_info structure based on u-boot environment
variable "i2cfast". (see also i2cfast)
CONFIG_I2C_MULTI_BUS
This option allows the use of multiple I2C buses, each of which
must have a controller. At any point in time, only one bus is
active. To switch to a different bus, use the 'i2c dev' command.
Note that bus numbering is zero-based.
CONFIG_SYS_I2C_NOPROBES
This option specifies a list of I2C devices that will be skipped
when the 'i2c probe' command is issued. If CONFIG_I2C_MULTI_BUS
is set, specify a list of bus-device pairs. Otherwise, specify
a 1D array of device addresses
e.g.
#undef CONFIG_I2C_MULTI_BUS
#define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
will skip addresses 0x50 and 0x68 on a board with one I2C bus
#define CONFIG_I2C_MULTI_BUS
#define CONFIG_SYS_I2C_MULTI_NOPROBES {{0,0x50},{0,0x68},{1,0x54}}
will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
CONFIG_SYS_SPD_BUS_NUM
If defined, then this indicates the I2C bus number for DDR SPD.
If not defined, then U-Boot assumes that SPD is on I2C bus 0.
CONFIG_SYS_RTC_BUS_NUM
If defined, then this indicates the I2C bus number for the RTC.
If not defined, then U-Boot assumes that RTC is on I2C bus 0.
CONFIG_SYS_DTT_BUS_NUM
If defined, then this indicates the I2C bus number for the DTT.
If not defined, then U-Boot assumes that DTT is on I2C bus 0.
CONFIG_SYS_I2C_DTT_ADDR:
If defined, specifies the I2C address of the DTT device.
If not defined, then U-Boot uses predefined value for
specified DTT device.
CONFIG_SOFT_I2C_READ_REPEATED_START
defining this will force the i2c_read() function in
the soft_i2c driver to perform an I2C repeated start
between writing the address pointer and reading the
data. If this define is omitted the default behaviour
of doing a stop-start sequence will be used. Most I2C
devices can use either method, but some require one or
the other.
- SPI Support: CONFIG_SPI
Enables SPI driver (so far only tested with
SPI EEPROM, also an instance works with Crystal A/D and
D/As on the SACSng board)
CONFIG_SH_SPI
Enables the driver for SPI controller on SuperH. Currently
only SH7757 is supported.
CONFIG_SPI_X
Enables extended (16-bit) SPI EEPROM addressing.
(symmetrical to CONFIG_I2C_X)
CONFIG_SOFT_SPI
Enables a software (bit-bang) SPI driver rather than
using hardware support. This is a general purpose
driver that only requires three general I/O port pins
(two outputs, one input) to function. If this is
defined, the board configuration must define several
SPI configuration items (port pins to use, etc). For
an example, see include/configs/sacsng.h.
CONFIG_HARD_SPI
Enables a hardware SPI driver for general-purpose reads
and writes. As with CONFIG_SOFT_SPI, the board configuration
must define a list of chip-select function pointers.
Currently supported on some MPC8xxx processors. For an
example, see include/configs/mpc8349emds.h.
CONFIG_MXC_SPI
Enables the driver for the SPI controllers on i.MX and MXC
SoCs. Currently i.MX31/35/51 are supported.
CONFIG_SYS_SPI_MXC_WAIT
Timeout for waiting until spi transfer completed.
default: (CONFIG_SYS_HZ/100) /* 10 ms */
- FPGA Support: CONFIG_FPGA
Enables FPGA subsystem.
CONFIG_FPGA_<vendor>
Enables support for specific chip vendors.
(ALTERA, XILINX)
CONFIG_FPGA_<family>
Enables support for FPGA family.
(SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
CONFIG_FPGA_COUNT
Specify the number of FPGA devices to support.
CONFIG_CMD_FPGA_LOADMK
Enable support for fpga loadmk command
CONFIG_CMD_FPGA_LOADP
Enable support for fpga loadp command - load partial bitstream
CONFIG_CMD_FPGA_LOADBP
Enable support for fpga loadbp command - load partial bitstream
(Xilinx only)
CONFIG_SYS_FPGA_PROG_FEEDBACK
Enable printing of hash marks during FPGA configuration.
CONFIG_SYS_FPGA_CHECK_BUSY
Enable checks on FPGA configuration interface busy
status by the configuration function. This option
will require a board or device specific function to
be written.
CONFIG_FPGA_DELAY
If defined, a function that provides delays in the FPGA
configuration driver.
CONFIG_SYS_FPGA_CHECK_CTRLC
Allow Control-C to interrupt FPGA configuration
CONFIG_SYS_FPGA_CHECK_ERROR
Check for configuration errors during FPGA bitfile
loading. For example, abort during Virtex II
configuration if the INIT_B line goes low (which
indicated a CRC error).
CONFIG_SYS_FPGA_WAIT_INIT
Maximum time to wait for the INIT_B line to de-assert
after PROB_B has been de-asserted during a Virtex II
FPGA configuration sequence. The default time is 500
ms.
CONFIG_SYS_FPGA_WAIT_BUSY
Maximum time to wait for BUSY to de-assert during
Virtex II FPGA configuration. The default is 5 ms.
CONFIG_SYS_FPGA_WAIT_CONFIG
Time to wait after FPGA configuration. The default is
200 ms.
- Configuration Management:
CONFIG_BUILD_TARGET
Some SoCs need special image types (e.g. U-Boot binary
with a special header) as build targets. By defining
CONFIG_BUILD_TARGET in the SoC / board header, this
special image will be automatically built upon calling
make / MAKEALL.
CONFIG_IDENT_STRING
If defined, this string will be added to the U-Boot
version information (U_BOOT_VERSION)
- Vendor Parameter Protection:
U-Boot considers the values of the environment
variables "serial#" (Board Serial Number) and
"ethaddr" (Ethernet Address) to be parameters that
are set once by the board vendor / manufacturer, and
protects these variables from casual modification by
the user. Once set, these variables are read-only,
and write or delete attempts are rejected. You can
change this behaviour:
If CONFIG_ENV_OVERWRITE is #defined in your config
file, the write protection for vendor parameters is
completely disabled. Anybody can change or delete
these parameters.
Alternatively, if you #define _both_ CONFIG_ETHADDR
_and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
Ethernet address is installed in the environment,
which can be changed exactly ONCE by the user. [The
serial# is unaffected by this, i. e. it remains
read-only.]
The same can be accomplished in a more flexible way
for any variable by configuring the type of access
to allow for those variables in the ".flags" variable
or define CONFIG_ENV_FLAGS_LIST_STATIC.
- Protected RAM:
CONFIG_PRAM
Define this variable to enable the reservation of
"protected RAM", i. e. RAM which is not overwritten
by U-Boot. Define CONFIG_PRAM to hold the number of
kB you want to reserve for pRAM. You can overwrite
this default value by defining an environment
variable "pram" to the number of kB you want to
reserve. Note that the board info structure will
still show the full amount of RAM. If pRAM is
reserved, a new environment variable "mem" will
automatically be defined to hold the amount of
remaining RAM in a form that can be passed as boot
argument to Linux, for instance like that:
setenv bootargs ... mem=\${mem}
saveenv
This way you can tell Linux not to use this memory,
either, which results in a memory region that will
not be affected by reboots.
*WARNING* If your board configuration uses automatic
detection of the RAM size, you must make sure that
this memory test is non-destructive. So far, the
following board configurations are known to be
"pRAM-clean":
IVMS8, IVML24, SPD8xx, TQM8xxL,
HERMES, IP860, RPXlite, LWMON,
FLAGADM, TQM8260
- Access to physical memory region (> 4GB)
Some basic support is provided for operations on memory not
normally accessible to U-Boot - e.g. some architectures
support access to more than 4GB of memory on 32-bit
machines using physical address extension or similar.
Define CONFIG_PHYSMEM to access this basic support, which
currently only supports clearing the memory.
- Error Recovery:
CONFIG_PANIC_HANG
Define this variable to stop the system in case of a
fatal error, so that you have to reset it manually.
This is probably NOT a good idea for an embedded
system where you want the system to reboot
automatically as fast as possible, but it may be
useful during development since you can try to debug
the conditions that lead to the situation.
CONFIG_NET_RETRY_COUNT
This variable defines the number of retries for
network operations like ARP, RARP, TFTP, or BOOTP
before giving up the operation. If not defined, a
default value of 5 is used.
CONFIG_ARP_TIMEOUT
Timeout waiting for an ARP reply in milliseconds.
CONFIG_NFS_TIMEOUT
Timeout in milliseconds used in NFS protocol.
If you encounter "ERROR: Cannot umount" in nfs command,
try longer timeout such as
#define CONFIG_NFS_TIMEOUT 10000UL
- Command Interpreter:
CONFIG_AUTO_COMPLETE
Enable auto completion of commands using TAB.
CONFIG_SYS_PROMPT_HUSH_PS2
This defines the secondary prompt string, which is
printed when the command interpreter needs more input
to complete a command. Usually "> ".
Note:
In the current implementation, the local variables
space and global environment variables space are
separated. Local variables are those you define by
simply typing `name=value'. To access a local
variable later on, you have write `$name' or
`${name}'; to execute the contents of a variable
directly type `$name' at the command prompt.
Global environment variables are those you use
setenv/printenv to work with. To run a command stored
in such a variable, you need to use the run command,
and you must not use the '$' sign to access them.
To store commands and special characters in a
variable, please use double quotation marks
surrounding the whole text of the variable, instead
of the backslashes before semicolons and special
symbols.
- Command Line Editing and History:
CONFIG_CMDLINE_EDITING
Enable editing and History functions for interactive
command line input operations
- Default Environment:
CONFIG_EXTRA_ENV_SETTINGS
Define this to contain any number of null terminated
strings (variable = value pairs) that will be part of
the default environment compiled into the boot image.
For example, place something like this in your
board's config file:
#define CONFIG_EXTRA_ENV_SETTINGS \
"myvar1=value1\0" \
"myvar2=value2\0"
Warning: This method is based on knowledge about the
internal format how the environment is stored by the
U-Boot code. This is NOT an official, exported
interface! Although it is unlikely that this format
will change soon, there is no guarantee either.
You better know what you are doing here.
Note: overly (ab)use of the default environment is
discouraged. Make sure to check other ways to preset
the environment like the "source" command or the
boot command first.
CONFIG_ENV_VARS_UBOOT_CONFIG
Define this in order to add variables describing the
U-Boot build configuration to the default environment.
These will be named arch, cpu, board, vendor, and soc.
Enabling this option will cause the following to be defined:
- CONFIG_SYS_ARCH
- CONFIG_SYS_CPU
- CONFIG_SYS_BOARD
- CONFIG_SYS_VENDOR
- CONFIG_SYS_SOC
CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
Define this in order to add variables describing certain
run-time determined information about the hardware to the
environment. These will be named board_name, board_rev.
CONFIG_DELAY_ENVIRONMENT
Normally the environment is loaded when the board is
initialised so that it is available to U-Boot. This inhibits
that so that the environment is not available until
explicitly loaded later by U-Boot code. With CONFIG_OF_CONTROL
this is instead controlled by the value of
/config/load-environment.
- DataFlash Support:
CONFIG_HAS_DATAFLASH
Defining this option enables DataFlash features and
allows to read/write in Dataflash via the standard
commands cp, md...
- Serial Flash support
CONFIG_CMD_SF
Defining this option enables SPI flash commands
'sf probe/read/write/erase/update'.
Usage requires an initial 'probe' to define the serial
flash parameters, followed by read/write/erase/update
commands.
The following defaults may be provided by the platform
to handle the common case when only a single serial
flash is present on the system.
CONFIG_SF_DEFAULT_BUS Bus identifier
CONFIG_SF_DEFAULT_CS Chip-select
CONFIG_SF_DEFAULT_MODE (see include/spi.h)
CONFIG_SF_DEFAULT_SPEED in Hz
CONFIG_CMD_SF_TEST
Define this option to include a destructive SPI flash
test ('sf test').
CONFIG_SPI_FLASH_BAR Ban/Extended Addr Reg
Define this option to use the Bank addr/Extended addr
support on SPI flashes which has size > 16Mbytes.
CONFIG_SF_DUAL_FLASH Dual flash memories
Define this option to use dual flash support where two flash
memories can be connected with a given cs line.
Currently Xilinx Zynq qspi supports these type of connections.
CONFIG_SYS_SPI_ST_ENABLE_WP_PIN
enable the W#/Vpp signal to disable writing to the status
register on ST MICRON flashes like the N25Q128.
The status register write enable/disable bit, combined with
the W#/VPP signal provides hardware data protection for the
device as follows: When the enable/disable bit is set to 1,
and the W#/VPP signal is driven LOW, the status register
nonvolatile bits become read-only and the WRITE STATUS REGISTER
operation will not execute. The only way to exit this
hardware-protected mode is to drive W#/VPP HIGH.
- SystemACE Support:
CONFIG_SYSTEMACE
Adding this option adds support for Xilinx SystemACE
chips attached via some sort of local bus. The address
of the chip must also be defined in the
CONFIG_SYS_SYSTEMACE_BASE macro. For example:
#define CONFIG_SYSTEMACE
#define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
When SystemACE support is added, the "ace" device type
becomes available to the fat commands, i.e. fatls.
- TFTP Fixed UDP Port:
CONFIG_TFTP_PORT
If this is defined, the environment variable tftpsrcp
is used to supply the TFTP UDP source port value.
If tftpsrcp isn't defined, the normal pseudo-random port
number generator is used.
Also, the environment variable tftpdstp is used to supply
the TFTP UDP destination port value. If tftpdstp isn't
defined, the normal port 69 is used.
The purpose for tftpsrcp is to allow a TFTP server to
blindly start the TFTP transfer using the pre-configured
target IP address and UDP port. This has the effect of
"punching through" the (Windows XP) firewall, allowing
the remainder of the TFTP transfer to proceed normally.
A better solution is to properly configure the firewall,
but sometimes that is not allowed.
- Hashing support:
CONFIG_CMD_HASH
This enables a generic 'hash' command which can produce
hashes / digests from a few algorithms (e.g. SHA1, SHA256).
CONFIG_HASH_VERIFY
Enable the hash verify command (hash -v). This adds to code
size a little.
CONFIG_SHA1 - This option enables support of hashing using SHA1
algorithm. The hash is calculated in software.
CONFIG_SHA256 - This option enables support of hashing using
SHA256 algorithm. The hash is calculated in software.
CONFIG_SHA_HW_ACCEL - This option enables hardware acceleration
for SHA1/SHA256 hashing.
This affects the 'hash' command and also the
hash_lookup_algo() function.
CONFIG_SHA_PROG_HW_ACCEL - This option enables
hardware-acceleration for SHA1/SHA256 progressive hashing.
Data can be streamed in a block at a time and the hashing
is performed in hardware.
Note: There is also a sha1sum command, which should perhaps
be deprecated in favour of 'hash sha1'.
- Freescale i.MX specific commands:
CONFIG_CMD_HDMIDETECT
This enables 'hdmidet' command which returns true if an
HDMI monitor is detected. This command is i.MX 6 specific.
CONFIG_CMD_BMODE
This enables the 'bmode' (bootmode) command for forcing
a boot from specific media.
This is useful for forcing the ROM's usb downloader to
activate upon a watchdog reset which is nice when iterating
on U-Boot. Using the reset button or running bmode normal
will set it back to normal. This command currently
supports i.MX53 and i.MX6.
- Signing support:
CONFIG_RSA
This enables the RSA algorithm used for FIT image verification
in U-Boot. See doc/uImage.FIT/signature.txt for more information.
The Modular Exponentiation algorithm in RSA is implemented using
driver model. So CONFIG_DM needs to be enabled by default for this
library to function.
The signing part is build into mkimage regardless of this
option. The software based modular exponentiation is built into
mkimage irrespective of this option.
- bootcount support:
CONFIG_BOOTCOUNT_LIMIT
This enables the bootcounter support, see:
http://www.denx.de/wiki/DULG/UBootBootCountLimit
CONFIG_AT91SAM9XE
enable special bootcounter support on at91sam9xe based boards.
CONFIG_BLACKFIN
enable special bootcounter support on blackfin based boards.
CONFIG_SOC_DA8XX
enable special bootcounter support on da850 based boards.
CONFIG_BOOTCOUNT_RAM
enable support for the bootcounter in RAM
CONFIG_BOOTCOUNT_I2C
enable support for the bootcounter on an i2c (like RTC) device.
CONFIG_SYS_I2C_RTC_ADDR = i2c chip address
CONFIG_SYS_BOOTCOUNT_ADDR = i2c addr which is used for
the bootcounter.
CONFIG_BOOTCOUNT_ALEN = address len
- Show boot progress:
CONFIG_SHOW_BOOT_PROGRESS
Defining this option allows to add some board-
specific code (calling a user-provided function
"show_boot_progress(int)") that enables you to show
the system's boot progress on some display (for
example, some LED's) on your board. At the moment,
the following checkpoints are implemented:
- Detailed boot stage timing
CONFIG_BOOTSTAGE
Define this option to get detailed timing of each stage
of the boot process.
CONFIG_BOOTSTAGE_USER_COUNT
This is the number of available user bootstage records.
Each time you call bootstage_mark(BOOTSTAGE_ID_ALLOC, ...)
a new ID will be allocated from this stash. If you exceed
the limit, recording will stop.
CONFIG_BOOTSTAGE_REPORT
Define this to print a report before boot, similar to this:
Timer summary in microseconds:
Mark Elapsed Stage
0 0 reset
3,575,678 3,575,678 board_init_f start
3,575,695 17 arch_cpu_init A9
3,575,777 82 arch_cpu_init done
3,659,598 83,821 board_init_r start
3,910,375 250,777 main_loop
29,916,167 26,005,792 bootm_start
30,361,327 445,160 start_kernel
CONFIG_CMD_BOOTSTAGE
Add a 'bootstage' command which supports printing a report
and un/stashing of bootstage data.
CONFIG_BOOTSTAGE_FDT
Stash the bootstage information in the FDT. A root 'bootstage'
node is created with each bootstage id as a child. Each child
has a 'name' property and either 'mark' containing the
mark time in microsecond, or 'accum' containing the
accumulated time for that bootstage id in microseconds.
For example:
bootstage {
154 {
name = "board_init_f";
mark = <3575678>;
};
170 {
name = "lcd";
accum = <33482>;
};
};
Code in the Linux kernel can find this in /proc/devicetree.
Legacy uImage format:
Arg Where When
1 common/cmd_bootm.c before attempting to boot an image
-1 common/cmd_bootm.c Image header has bad magic number
2 common/cmd_bootm.c Image header has correct magic number
-2 common/cmd_bootm.c Image header has bad checksum
3 common/cmd_bootm.c Image header has correct checksum
-3 common/cmd_bootm.c Image data has bad checksum
4 common/cmd_bootm.c Image data has correct checksum
-4 common/cmd_bootm.c Image is for unsupported architecture
5 common/cmd_bootm.c Architecture check OK
-5 common/cmd_bootm.c Wrong Image Type (not kernel, multi)
6 common/cmd_bootm.c Image Type check OK
-6 common/cmd_bootm.c gunzip uncompression error
-7 common/cmd_bootm.c Unimplemented compression type
7 common/cmd_bootm.c Uncompression OK
8 common/cmd_bootm.c No uncompress/copy overwrite error
-9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX)
9 common/image.c Start initial ramdisk verification
-10 common/image.c Ramdisk header has bad magic number
-11 common/image.c Ramdisk header has bad checksum
10 common/image.c Ramdisk header is OK
-12 common/image.c Ramdisk data has bad checksum
11 common/image.c Ramdisk data has correct checksum
12 common/image.c Ramdisk verification complete, start loading
-13 common/image.c Wrong Image Type (not PPC Linux ramdisk)
13 common/image.c Start multifile image verification
14 common/image.c No initial ramdisk, no multifile, continue.
15 arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
-30 arch/powerpc/lib/board.c Fatal error, hang the system
-31 post/post.c POST test failed, detected by post_output_backlog()
-32 post/post.c POST test failed, detected by post_run_single()
34 common/cmd_doc.c before loading a Image from a DOC device
-35 common/cmd_doc.c Bad usage of "doc" command
35 common/cmd_doc.c correct usage of "doc" command
-36 common/cmd_doc.c No boot device
36 common/cmd_doc.c correct boot device
-37 common/cmd_doc.c Unknown Chip ID on boot device
37 common/cmd_doc.c correct chip ID found, device available
-38 common/cmd_doc.c Read Error on boot device
38 common/cmd_doc.c reading Image header from DOC device OK
-39 common/cmd_doc.c Image header has bad magic number
39 common/cmd_doc.c Image header has correct magic number
-40 common/cmd_doc.c Error reading Image from DOC device
40 common/cmd_doc.c Image header has correct magic number
41 common/cmd_ide.c before loading a Image from a IDE device
-42 common/cmd_ide.c Bad usage of "ide" command
42 common/cmd_ide.c correct usage of "ide" command
-43 common/cmd_ide.c No boot device
43 common/cmd_ide.c boot device found
-44 common/cmd_ide.c Device not available
44 common/cmd_ide.c Device available
-45 common/cmd_ide.c wrong partition selected
45 common/cmd_ide.c partition selected
-46 common/cmd_ide.c Unknown partition table
46 common/cmd_ide.c valid partition table found
-47 common/cmd_ide.c Invalid partition type
47 common/cmd_ide.c correct partition type
-48 common/cmd_ide.c Error reading Image Header on boot device
48 common/cmd_ide.c reading Image Header from IDE device OK
-49 common/cmd_ide.c Image header has bad magic number
49 common/cmd_ide.c Image header has correct magic number
-50 common/cmd_ide.c Image header has bad checksum
50 common/cmd_ide.c Image header has correct checksum
-51 common/cmd_ide.c Error reading Image from IDE device
51 common/cmd_ide.c reading Image from IDE device OK
52 common/cmd_nand.c before loading a Image from a NAND device
-53 common/cmd_nand.c Bad usage of "nand" command
53 common/cmd_nand.c correct usage of "nand" command
-54 common/cmd_nand.c No boot device
54 common/cmd_nand.c boot device found
-55 common/cmd_nand.c Unknown Chip ID on boot device
55 common/cmd_nand.c correct chip ID found, device available
-56 common/cmd_nand.c Error reading Image Header on boot device
56 common/cmd_nand.c reading Image Header from NAND device OK
-57 common/cmd_nand.c Image header has bad magic number
57 common/cmd_nand.c Image header has correct magic number
-58 common/cmd_nand.c Error reading Image from NAND device
58 common/cmd_nand.c reading Image from NAND device OK
-60 common/env_common.c Environment has a bad CRC, using default
64 net/eth.c starting with Ethernet configuration.
-64 net/eth.c no Ethernet found.
65 net/eth.c Ethernet found.
-80 common/cmd_net.c usage wrong
80 common/cmd_net.c before calling NetLoop()
-81 common/cmd_net.c some error in NetLoop() occurred
81 common/cmd_net.c NetLoop() back without error
-82 common/cmd_net.c size == 0 (File with size 0 loaded)
82 common/cmd_net.c trying automatic boot
83 common/cmd_net.c running "source" command
-83 common/cmd_net.c some error in automatic boot or "source" command
84 common/cmd_net.c end without errors
FIT uImage format:
Arg Where When
100 common/cmd_bootm.c Kernel FIT Image has correct format
-100 common/cmd_bootm.c Kernel FIT Image has incorrect format
101 common/cmd_bootm.c No Kernel subimage unit name, using configuration
-101 common/cmd_bootm.c Can't get configuration for kernel subimage
102 common/cmd_bootm.c Kernel unit name specified
-103 common/cmd_bootm.c Can't get kernel subimage node offset
103 common/cmd_bootm.c Found configuration node
104 common/cmd_bootm.c Got kernel subimage node offset
-104 common/cmd_bootm.c Kernel subimage hash verification failed
105 common/cmd_bootm.c Kernel subimage hash verification OK
-105 common/cmd_bootm.c Kernel subimage is for unsupported architecture
106 common/cmd_bootm.c Architecture check OK
-106 common/cmd_bootm.c Kernel subimage has wrong type
107 common/cmd_bootm.c Kernel subimage type OK
-107 common/cmd_bootm.c Can't get kernel subimage data/size
108 common/cmd_bootm.c Got kernel subimage data/size
-108 common/cmd_bootm.c Wrong image type (not legacy, FIT)
-109 common/cmd_bootm.c Can't get kernel subimage type
-110 common/cmd_bootm.c Can't get kernel subimage comp
-111 common/cmd_bootm.c Can't get kernel subimage os
-112 common/cmd_bootm.c Can't get kernel subimage load address
-113 common/cmd_bootm.c Image uncompress/copy overwrite error
120 common/image.c Start initial ramdisk verification
-120 common/image.c Ramdisk FIT image has incorrect format
121 common/image.c Ramdisk FIT image has correct format
122 common/image.c No ramdisk subimage unit name, using configuration
-122 common/image.c Can't get configuration for ramdisk subimage
123 common/image.c Ramdisk unit name specified
-124 common/image.c Can't get ramdisk subimage node offset
125 common/image.c Got ramdisk subimage node offset
-125 common/image.c Ramdisk subimage hash verification failed
126 common/image.c Ramdisk subimage hash verification OK
-126 common/image.c Ramdisk subimage for unsupported architecture
127 common/image.c Architecture check OK
-127 common/image.c Can't get ramdisk subimage data/size
128 common/image.c Got ramdisk subimage data/size
129 common/image.c Can't get ramdisk load address
-129 common/image.c Got ramdisk load address
-130 common/cmd_doc.c Incorrect FIT image format
131 common/cmd_doc.c FIT image format OK
-140 common/cmd_ide.c Incorrect FIT image format
141 common/cmd_ide.c FIT image format OK
-150 common/cmd_nand.c Incorrect FIT image format
151 common/cmd_nand.c FIT image format OK
- legacy image format:
CONFIG_IMAGE_FORMAT_LEGACY
enables the legacy image format support in U-Boot.
Default:
enabled if CONFIG_FIT_SIGNATURE is not defined.
CONFIG_DISABLE_IMAGE_LEGACY
disable the legacy image format
This define is introduced, as the legacy image format is
enabled per default for backward compatibility.
- FIT image support:
CONFIG_FIT
Enable support for the FIT uImage format.
CONFIG_FIT_BEST_MATCH
When no configuration is explicitly selected, default to the
one whose fdt's compatibility field best matches that of
U-Boot itself. A match is considered "best" if it matches the
most specific compatibility entry of U-Boot's fdt's root node.
The order of entries in the configuration's fdt is ignored.
CONFIG_FIT_SIGNATURE
This option enables signature verification of FIT uImages,
using a hash signed and verified using RSA. If
CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
hashing is available using hardware, RSA library will use it.
See doc/uImage.FIT/signature.txt for more details.
WARNING: When relying on signed FIT images with required
signature check the legacy image format is default
disabled. If a board need legacy image format support
enable this through CONFIG_IMAGE_FORMAT_LEGACY
CONFIG_FIT_DISABLE_SHA256
Supporting SHA256 hashes has quite an impact on binary size.
For constrained systems sha256 hash support can be disabled
with this option.
- Standalone program support:
CONFIG_STANDALONE_LOAD_ADDR
This option defines a board specific value for the
address where standalone program gets loaded, thus
overwriting the architecture dependent default
settings.
- Frame Buffer Address:
CONFIG_FB_ADDR
Define CONFIG_FB_ADDR if you want to use specific
address for frame buffer. This is typically the case
when using a graphics controller has separate video
memory. U-Boot will then place the frame buffer at
the given address instead of dynamically reserving it
in system RAM by calling lcd_setmem(), which grabs
the memory for the frame buffer depending on the
configured panel size.
Please see board_init_f function.
- Automatic software updates via TFTP server
CONFIG_UPDATE_TFTP
CONFIG_UPDATE_TFTP_CNT_MAX
CONFIG_UPDATE_TFTP_MSEC_MAX
These options enable and control the auto-update feature;
for a more detailed description refer to doc/README.update.
- MTD Support (mtdparts command, UBI support)
CONFIG_MTD_DEVICE
Adds the MTD device infrastructure from the Linux kernel.
Needed for mtdparts command support.
CONFIG_MTD_PARTITIONS
Adds the MTD partitioning infrastructure from the Linux
kernel. Needed for UBI support.
- UBI support
CONFIG_CMD_UBI
Adds commands for interacting with MTD partitions formatted
with the UBI flash translation layer
Requires also defining CONFIG_RBTREE
CONFIG_UBI_SILENCE_MSG
Make the verbose messages from UBI stop printing. This leaves
warnings and errors enabled.
CONFIG_MTD_UBI_WL_THRESHOLD
This parameter defines the maximum difference between the highest
erase counter value and the lowest erase counter value of eraseblocks
of UBI devices. When this threshold is exceeded, UBI starts performing
wear leveling by means of moving data from eraseblock with low erase
counter to eraseblocks with high erase counter.
The default value should be OK for SLC NAND flashes, NOR flashes and
other flashes which have eraseblock life-cycle 100000 or more.
However, in case of MLC NAND flashes which typically have eraseblock
life-cycle less than 10000, the threshold should be lessened (e.g.,
to 128 or 256, although it does not have to be power of 2).
default: 4096
CONFIG_MTD_UBI_BEB_LIMIT
This option specifies the maximum bad physical eraseblocks UBI
expects on the MTD device (per 1024 eraseblocks). If the
underlying flash does not admit of bad eraseblocks (e.g. NOR
flash), this value is ignored.
NAND datasheets often specify the minimum and maximum NVM
(Number of Valid Blocks) for the flashes' endurance lifetime.
The maximum expected bad eraseblocks per 1024 eraseblocks
then can be calculated as "1024 * (1 - MinNVB / MaxNVB)",
which gives 20 for most NANDs (MaxNVB is basically the total
count of eraseblocks on the chip).
To put it differently, if this value is 20, UBI will try to
reserve about 1.9% of physical eraseblocks for bad blocks
handling. And that will be 1.9% of eraseblocks on the entire
NAND chip, not just the MTD partition UBI attaches. This means
that if you have, say, a NAND flash chip admits maximum 40 bad
eraseblocks, and it is split on two MTD partitions of the same
size, UBI will reserve 40 eraseblocks when attaching a
partition.
default: 20
CONFIG_MTD_UBI_FASTMAP
Fastmap is a mechanism which allows attaching an UBI device
in nearly constant time. Instead of scanning the whole MTD device it
only has to locate a checkpoint (called fastmap) on the device.
The on-flash fastmap contains all information needed to attach
the device. Using fastmap makes only sense on large devices where
attaching by scanning takes long. UBI will not automatically install
a fastmap on old images, but you can set the UBI parameter
CONFIG_MTD_UBI_FASTMAP_AUTOCONVERT to 1 if you want so. Please note
that fastmap-enabled images are still usable with UBI implementations
without fastmap support. On typical flash devices the whole fastmap
fits into one PEB. UBI will reserve PEBs to hold two fastmaps.
CONFIG_MTD_UBI_FASTMAP_AUTOCONVERT
Set this parameter to enable fastmap automatically on images
without a fastmap.
default: 0
CONFIG_MTD_UBI_FM_DEBUG
Enable UBI fastmap debug
default: 0
- UBIFS support
CONFIG_CMD_UBIFS
Adds commands for interacting with UBI volumes formatted as
UBIFS. UBIFS is read-only in u-boot.
Requires UBI support as well as CONFIG_LZO
CONFIG_UBIFS_SILENCE_MSG
Make the verbose messages from UBIFS stop printing. This leaves
warnings and errors enabled.
- SPL framework
CONFIG_SPL
Enable building of SPL globally.
CONFIG_SPL_LDSCRIPT
LDSCRIPT for linking the SPL binary.
CONFIG_SPL_MAX_FOOTPRINT
Maximum size in memory allocated to the SPL, BSS included.
When defined, the linker checks that the actual memory
used by SPL from _start to __bss_end does not exceed it.
CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE
must not be both defined at the same time.
CONFIG_SPL_MAX_SIZE
Maximum size of the SPL image (text, data, rodata, and
linker lists sections), BSS excluded.
When defined, the linker checks that the actual size does
not exceed it.
CONFIG_SPL_TEXT_BASE
TEXT_BASE for linking the SPL binary.
CONFIG_SPL_RELOC_TEXT_BASE
Address to relocate to. If unspecified, this is equal to
CONFIG_SPL_TEXT_BASE (i.e. no relocation is done).
CONFIG_SPL_BSS_START_ADDR
Link address for the BSS within the SPL binary.
CONFIG_SPL_BSS_MAX_SIZE
Maximum size in memory allocated to the SPL BSS.
When defined, the linker checks that the actual memory used
by SPL from __bss_start to __bss_end does not exceed it.
CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE
must not be both defined at the same time.
CONFIG_SPL_STACK
Adress of the start of the stack SPL will use
CONFIG_SPL_PANIC_ON_RAW_IMAGE
When defined, SPL will panic() if the image it has
loaded does not have a signature.
Defining this is useful when code which loads images
in SPL cannot guarantee that absolutely all read errors
will be caught.
An example is the LPC32XX MLC NAND driver, which will
consider that a completely unreadable NAND block is bad,
and thus should be skipped silently.
CONFIG_SPL_RELOC_STACK
Adress of the start of the stack SPL will use after
relocation. If unspecified, this is equal to
CONFIG_SPL_STACK.
CONFIG_SYS_SPL_MALLOC_START
Starting address of the malloc pool used in SPL.
CONFIG_SYS_SPL_MALLOC_SIZE
The size of the malloc pool used in SPL.
CONFIG_SPL_FRAMEWORK
Enable the SPL framework under common/. This framework
supports MMC, NAND and YMODEM loading of U-Boot and NAND
NAND loading of the Linux Kernel.
CONFIG_SPL_OS_BOOT
Enable booting directly to an OS from SPL.
See also: doc/README.falcon
CONFIG_SPL_DISPLAY_PRINT
For ARM, enable an optional function to print more information
about the running system.
CONFIG_SPL_INIT_MINIMAL
Arch init code should be built for a very small image
CONFIG_SPL_LIBCOMMON_SUPPORT
Support for common/libcommon.o in SPL binary
CONFIG_SPL_LIBDISK_SUPPORT
Support for disk/libdisk.o in SPL binary
CONFIG_SPL_I2C_SUPPORT
Support for drivers/i2c/libi2c.o in SPL binary
CONFIG_SPL_GPIO_SUPPORT
Support for drivers/gpio/libgpio.o in SPL binary
CONFIG_SPL_MMC_SUPPORT
Support for drivers/mmc/libmmc.o in SPL binary
CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR,
CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS,
Address and partition on the MMC to load U-Boot from
when the MMC is being used in raw mode.
CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION
Partition on the MMC to load U-Boot from when the MMC is being
used in raw mode
CONFIG_SYS_MMCSD_RAW_MODE_KERNEL_SECTOR
Sector to load kernel uImage from when MMC is being
used in raw mode (for Falcon mode)
CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTOR,
CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTORS
Sector and number of sectors to load kernel argument
parameters from when MMC is being used in raw mode
(for falcon mode)
CONFIG_SYS_MMCSD_FS_BOOT_PARTITION
Partition on the MMC to load U-Boot from when the MMC is being
used in fs mode
CONFIG_SPL_FAT_SUPPORT
Support for fs/fat/libfat.o in SPL binary
CONFIG_SPL_EXT_SUPPORT
Support for EXT filesystem in SPL binary
CONFIG_SPL_FS_LOAD_PAYLOAD_NAME
Filename to read to load U-Boot when reading from filesystem
CONFIG_SPL_FS_LOAD_KERNEL_NAME
Filename to read to load kernel uImage when reading
from filesystem (for Falcon mode)
CONFIG_SPL_FS_LOAD_ARGS_NAME
Filename to read to load kernel argument parameters
when reading from filesystem (for Falcon mode)
CONFIG_SPL_MPC83XX_WAIT_FOR_NAND
Set this for NAND SPL on PPC mpc83xx targets, so that
start.S waits for the rest of the SPL to load before
continuing (the hardware starts execution after just
loading the first page rather than the full 4K).
CONFIG_SPL_SKIP_RELOCATE
Avoid SPL relocation
CONFIG_SPL_NAND_BASE
Include nand_base.c in the SPL. Requires
CONFIG_SPL_NAND_DRIVERS.
CONFIG_SPL_NAND_DRIVERS
SPL uses normal NAND drivers, not minimal drivers.
CONFIG_SPL_NAND_ECC
Include standard software ECC in the SPL
CONFIG_SPL_NAND_SIMPLE
Support for NAND boot using simple NAND drivers that
expose the cmd_ctrl() interface.
CONFIG_SPL_MTD_SUPPORT
Support for the MTD subsystem within SPL. Useful for
environment on NAND support within SPL.
CONFIG_SPL_NAND_RAW_ONLY
Support to boot only raw u-boot.bin images. Use this only
if you need to save space.
CONFIG_SPL_MPC8XXX_INIT_DDR_SUPPORT
Set for the SPL on PPC mpc8xxx targets, support for
drivers/ddr/fsl/libddr.o in SPL binary.
CONFIG_SPL_COMMON_INIT_DDR
Set for common ddr init with serial presence detect in
SPL binary.
CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_COUNT,
CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE,
CONFIG_SYS_NAND_BLOCK_SIZE, CONFIG_SYS_NAND_BAD_BLOCK_POS,
CONFIG_SYS_NAND_ECCPOS, CONFIG_SYS_NAND_ECCSIZE,
CONFIG_SYS_NAND_ECCBYTES
Defines the size and behavior of the NAND that SPL uses
to read U-Boot
CONFIG_SPL_NAND_BOOT
Add support NAND boot
CONFIG_SYS_NAND_U_BOOT_OFFS
Location in NAND to read U-Boot from
CONFIG_SYS_NAND_U_BOOT_DST
Location in memory to load U-Boot to
CONFIG_SYS_NAND_U_BOOT_SIZE
Size of image to load
CONFIG_SYS_NAND_U_BOOT_START
Entry point in loaded image to jump to
CONFIG_SYS_NAND_HW_ECC_OOBFIRST
Define this if you need to first read the OOB and then the
data. This is used, for example, on davinci platforms.
CONFIG_SPL_OMAP3_ID_NAND
Support for an OMAP3-specific set of functions to return the
ID and MFR of the first attached NAND chip, if present.
CONFIG_SPL_SERIAL_SUPPORT
Support for drivers/serial/libserial.o in SPL binary
CONFIG_SPL_SPI_FLASH_SUPPORT
Support for drivers/mtd/spi/libspi_flash.o in SPL binary
CONFIG_SPL_SPI_SUPPORT
Support for drivers/spi/libspi.o in SPL binary
CONFIG_SPL_RAM_DEVICE
Support for running image already present in ram, in SPL binary
CONFIG_SPL_LIBGENERIC_SUPPORT
Support for lib/libgeneric.o in SPL binary
CONFIG_SPL_ENV_SUPPORT
Support for the environment operating in SPL binary
CONFIG_SPL_NET_SUPPORT
Support for the net/libnet.o in SPL binary.
It conflicts with SPL env from storage medium specified by
CONFIG_ENV_IS_xxx but CONFIG_ENV_IS_NOWHERE
CONFIG_SPL_PAD_TO
Image offset to which the SPL should be padded before appending
the SPL payload. By default, this is defined as
CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined.
CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL
payload without any padding, or >= CONFIG_SPL_MAX_SIZE.
CONFIG_SPL_TARGET
Final target image containing SPL and payload. Some SPLs
use an arch-specific makefile fragment instead, for
example if more than one image needs to be produced.
CONFIG_FIT_SPL_PRINT
Printing information about a FIT image adds quite a bit of
code to SPL. So this is normally disabled in SPL. Use this
option to re-enable it. This will affect the output of the
bootm command when booting a FIT image.
- TPL framework
CONFIG_TPL
Enable building of TPL globally.
CONFIG_TPL_PAD_TO
Image offset to which the TPL should be padded before appending
the TPL payload. By default, this is defined as
CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined.
CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL
payload without any padding, or >= CONFIG_SPL_MAX_SIZE.
Modem Support:
--------------
[so far only for SMDK2400 boards]
- Modem support enable:
CONFIG_MODEM_SUPPORT
- RTS/CTS Flow control enable:
CONFIG_HWFLOW
- Modem debug support:
CONFIG_MODEM_SUPPORT_DEBUG
Enables debugging stuff (char screen[1024], dbg())
for modem support. Useful only with BDI2000.
- Interrupt support (PPC):
There are common interrupt_init() and timer_interrupt()
for all PPC archs. interrupt_init() calls interrupt_init_cpu()
for CPU specific initialization. interrupt_init_cpu()
should set decrementer_count to appropriate value. If
CPU resets decrementer automatically after interrupt
(ppc4xx) it should set decrementer_count to zero.
timer_interrupt() calls timer_interrupt_cpu() for CPU
specific handling. If board has watchdog / status_led
/ other_activity_monitor it works automatically from
general timer_interrupt().
- General:
In the target system modem support is enabled when a
specific key (key combination) is pressed during
power-on. Otherwise U-Boot will boot normally
(autoboot). The key_pressed() function is called from
board_init(). Currently key_pressed() is a dummy
function, returning 1 and thus enabling modem
initialization.
If there are no modem init strings in the
environment, U-Boot proceed to autoboot; the
previous output (banner, info printfs) will be
suppressed, though.
See also: doc/README.Modem
Board initialization settings:
------------------------------
During Initialization u-boot calls a number of board specific functions
to allow the preparation of board specific prerequisites, e.g. pin setup
before drivers are initialized. To enable these callbacks the
following configuration macros have to be defined. Currently this is
architecture specific, so please check arch/your_architecture/lib/board.c
typically in board_init_f() and board_init_r().
- CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f()
- CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r()
- CONFIG_BOARD_LATE_INIT: Call board_late_init()
- CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init()
Configuration Settings:
-----------------------
- CONFIG_SYS_SUPPORT_64BIT_DATA: Defined automatically if compiled as 64-bit.
Optionally it can be defined to support 64-bit memory commands.
- CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
undefine this when you're short of memory.
- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
width of the commands listed in the 'help' command output.
- CONFIG_SYS_PROMPT: This is what U-Boot prints on the console to
prompt for user input.
- CONFIG_SYS_CBSIZE: Buffer size for input from the Console
- CONFIG_SYS_PBSIZE: Buffer size for Console output
- CONFIG_SYS_MAXARGS: max. Number of arguments accepted for monitor commands
- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
the application (usually a Linux kernel) when it is
booted
- CONFIG_SYS_BAUDRATE_TABLE:
List of legal baudrate settings for this board.
- CONFIG_SYS_CONSOLE_INFO_QUIET
Suppress display of console information at boot.
- CONFIG_SYS_CONSOLE_IS_IN_ENV
If the board specific function
extern int overwrite_console (void);
returns 1, the stdin, stderr and stdout are switched to the
serial port, else the settings in the environment are used.
- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
Enable the call to overwrite_console().
- CONFIG_SYS_CONSOLE_ENV_OVERWRITE
Enable overwrite of previous console environment settings.
- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
Begin and End addresses of the area used by the
simple memory test.
- CONFIG_SYS_ALT_MEMTEST:
Enable an alternate, more extensive memory test.
- CONFIG_SYS_MEMTEST_SCRATCH:
Scratch address used by the alternate memory test
You only need to set this if address zero isn't writeable
- CONFIG_SYS_MEM_TOP_HIDE (PPC only):
If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
this specified memory area will get subtracted from the top
(end) of RAM and won't get "touched" at all by U-Boot. By
fixing up gd->ram_size the Linux kernel should gets passed
the now "corrected" memory size and won't touch it either.
This should work for arch/ppc and arch/powerpc. Only Linux
board ports in arch/powerpc with bootwrapper support that
recalculate the memory size from the SDRAM controller setup
will have to get fixed in Linux additionally.
This option can be used as a workaround for the 440EPx/GRx
CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
be touched.
WARNING: Please make sure that this value is a multiple of
the Linux page size (normally 4k). If this is not the case,
then the end address of the Linux memory will be located at a
non page size aligned address and this could cause major
problems.
- CONFIG_SYS_LOADS_BAUD_CHANGE:
Enable temporary baudrate change while serial download
- CONFIG_SYS_SDRAM_BASE:
Physical start address of SDRAM. _Must_ be 0 here.
- CONFIG_SYS_MBIO_BASE:
Physical start address of Motherboard I/O (if using a
Cogent motherboard)
- CONFIG_SYS_FLASH_BASE:
Physical start address of Flash memory.
- CONFIG_SYS_MONITOR_BASE:
Physical start address of boot monitor code (set by
make config files to be same as the text base address
(CONFIG_SYS_TEXT_BASE) used when linking) - same as
CONFIG_SYS_FLASH_BASE when booting from flash.
- CONFIG_SYS_MONITOR_LEN:
Size of memory reserved for monitor code, used to
determine _at_compile_time_ (!) if the environment is
embedded within the U-Boot image, or in a separate
flash sector.
- CONFIG_SYS_MALLOC_LEN:
Size of DRAM reserved for malloc() use.
- CONFIG_SYS_MALLOC_F_LEN
Size of the malloc() pool for use before relocation. If
this is defined, then a very simple malloc() implementation
will become available before relocation. The address is just
below the global data, and the stack is moved down to make
space.
This feature allocates regions with increasing addresses
within the region. calloc() is supported, but realloc()
is not available. free() is supported but does nothing.
The memory will be freed (or in fact just forgotten) when
U-Boot relocates itself.
Pre-relocation malloc() is only supported on ARM and sandbox
at present but is fairly easy to enable for other archs.
- CONFIG_SYS_MALLOC_SIMPLE
Provides a simple and small malloc() and calloc() for those
boards which do not use the full malloc in SPL (which is
enabled with CONFIG_SYS_SPL_MALLOC_START).
- CONFIG_SYS_NONCACHED_MEMORY:
Size of non-cached memory area. This area of memory will be
typically located right below the malloc() area and mapped
uncached in the MMU. This is useful for drivers that would
otherwise require a lot of explicit cache maintenance. For
some drivers it's also impossible to properly maintain the
cache. For example if the regions that need to be flushed
are not a multiple of the cache-line size, *and* padding
cannot be allocated between the regions to align them (i.e.
if the HW requires a contiguous array of regions, and the
size of each region is not cache-aligned), then a flush of
one region may result in overwriting data that hardware has
written to another region in the same cache-line. This can
happen for example in network drivers where descriptors for
buffers are typically smaller than the CPU cache-line (e.g.
16 bytes vs. 32 or 64 bytes).
Non-cached memory is only supported on 32-bit ARM at present.
- CONFIG_SYS_BOOTM_LEN:
Normally compressed uImages are limited to an
uncompressed size of 8 MBytes. If this is not enough,
you can define CONFIG_SYS_BOOTM_LEN in your board config file
to adjust this setting to your needs.
- CONFIG_SYS_BOOTMAPSZ:
Maximum size of memory mapped by the startup code of
the Linux kernel; all data that must be processed by
the Linux kernel (bd_info, boot arguments, FDT blob if
used) must be put below this limit, unless "bootm_low"
environment variable is defined and non-zero. In such case
all data for the Linux kernel must be between "bootm_low"
and "bootm_low" + CONFIG_SYS_BOOTMAPSZ. The environment
variable "bootm_mapsize" will override the value of
CONFIG_SYS_BOOTMAPSZ. If CONFIG_SYS_BOOTMAPSZ is undefined,
then the value in "bootm_size" will be used instead.
- CONFIG_SYS_BOOT_RAMDISK_HIGH:
Enable initrd_high functionality. If defined then the
initrd_high feature is enabled and the bootm ramdisk subcommand
is enabled.
- CONFIG_SYS_BOOT_GET_CMDLINE:
Enables allocating and saving kernel cmdline in space between
"bootm_low" and "bootm_low" + BOOTMAPSZ.
- CONFIG_SYS_BOOT_GET_KBD:
Enables allocating and saving a kernel copy of the bd_info in
space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
- CONFIG_SYS_MAX_FLASH_BANKS:
Max number of Flash memory banks
- CONFIG_SYS_MAX_FLASH_SECT:
Max number of sectors on a Flash chip
- CONFIG_SYS_FLASH_ERASE_TOUT:
Timeout for Flash erase operations (in ms)
- CONFIG_SYS_FLASH_WRITE_TOUT:
Timeout for Flash write operations (in ms)
- CONFIG_SYS_FLASH_LOCK_TOUT
Timeout for Flash set sector lock bit operation (in ms)
- CONFIG_SYS_FLASH_UNLOCK_TOUT
Timeout for Flash clear lock bits operation (in ms)
- CONFIG_SYS_FLASH_PROTECTION
If defined, hardware flash sectors protection is used
instead of U-Boot software protection.
- CONFIG_SYS_DIRECT_FLASH_TFTP:
Enable TFTP transfers directly to flash memory;
without this option such a download has to be
performed in two steps: (1) download to RAM, and (2)
copy from RAM to flash.
The two-step approach is usually more reliable, since
you can check if the download worked before you erase
the flash, but in some situations (when system RAM is
too limited to allow for a temporary copy of the
downloaded image) this option may be very useful.
- CONFIG_SYS_FLASH_CFI:
Define if the flash driver uses extra elements in the
common flash structure for storing flash geometry.
- CONFIG_FLASH_CFI_DRIVER
This option also enables the building of the cfi_flash driver
in the drivers directory
- CONFIG_FLASH_CFI_MTD
This option enables the building of the cfi_mtd driver
in the drivers directory. The driver exports CFI flash
to the MTD layer.
- CONFIG_SYS_FLASH_USE_BUFFER_WRITE
Use buffered writes to flash.
- CONFIG_FLASH_SPANSION_S29WS_N
s29ws-n MirrorBit flash has non-standard addresses for buffered
write commands.
- CONFIG_SYS_FLASH_QUIET_TEST
If this option is defined, the common CFI flash doesn't
print it's warning upon not recognized FLASH banks. This
is useful, if some of the configured banks are only
optionally available.
- CONFIG_FLASH_SHOW_PROGRESS
If defined (must be an integer), print out countdown
digits and dots. Recommended value: 45 (9..1) for 80
column displays, 15 (3..1) for 40 column displays.
- CONFIG_FLASH_VERIFY
If defined, the content of the flash (destination) is compared
against the source after the write operation. An error message
will be printed when the contents are not identical.
Please note that this option is useless in nearly all cases,
since such flash programming errors usually are detected earlier
while unprotecting/erasing/programming. Please only enable
this option if you really know what you are doing.
- CONFIG_SYS_RX_ETH_BUFFER:
Defines the number of Ethernet receive buffers. On some
Ethernet controllers it is recommended to set this value
to 8 or even higher (EEPRO100 or 405 EMAC), since all
buffers can be full shortly after enabling the interface
on high Ethernet traffic.
Defaults to 4 if not defined.
- CONFIG_ENV_MAX_ENTRIES
Maximum number of entries in the hash table that is used
internally to store the environment settings. The default
setting is supposed to be generous and should work in most
cases. This setting can be used to tune behaviour; see
lib/hashtable.c for details.
- CONFIG_ENV_FLAGS_LIST_DEFAULT
- CONFIG_ENV_FLAGS_LIST_STATIC
Enable validation of the values given to environment variables when
calling env set. Variables can be restricted to only decimal,
hexadecimal, or boolean. If CONFIG_CMD_NET is also defined,
the variables can also be restricted to IP address or MAC address.
The format of the list is:
type_attribute = [s|d|x|b|i|m]
access_attribute = [a|r|o|c]
attributes = type_attribute[access_attribute]
entry = variable_name[:attributes]
list = entry[,list]
The type attributes are:
s - String (default)
d - Decimal
x - Hexadecimal
b - Boolean ([1yYtT|0nNfF])
i - IP address
m - MAC address
The access attributes are:
a - Any (default)
r - Read-only
o - Write-once
c - Change-default
- CONFIG_ENV_FLAGS_LIST_DEFAULT
Define this to a list (string) to define the ".flags"
environment variable in the default or embedded environment.
- CONFIG_ENV_FLAGS_LIST_STATIC
Define this to a list (string) to define validation that
should be done if an entry is not found in the ".flags"
environment variable. To override a setting in the static
list, simply add an entry for the same variable name to the
".flags" variable.
- CONFIG_ENV_ACCESS_IGNORE_FORCE
If defined, don't allow the -f switch to env set override variable
access flags.
- CONFIG_SYS_GENERIC_BOARD
This selects the architecture-generic board system instead of the
architecture-specific board files. It is intended to move boards
to this new framework over time. Defining this will disable the
arch/foo/lib/board.c file and use common/board_f.c and
common/board_r.c instead. To use this option your architecture
must support it (i.e. must select HAVE_GENERIC_BOARD in arch/Kconfig).
If you find problems enabling this option on your board please report
the problem and send patches!
- CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC (OMAP only)
This is set by OMAP boards for the max time that reset should
be asserted. See doc/README.omap-reset-time for details on how
the value can be calculated on a given board.
- CONFIG_USE_STDINT
If stdint.h is available with your toolchain you can define this
option to enable it. You can provide option 'USE_STDINT=1' when
building U-Boot to enable this.
The following definitions that deal with the placement and management
of environment data (variable area); in general, we support the
following configurations:
- CONFIG_BUILD_ENVCRC:
Builds up envcrc with the target environment so that external utils
may easily extract it and embed it in final U-Boot images.
- CONFIG_ENV_IS_IN_FLASH:
Define this if the environment is in flash memory.
a) The environment occupies one whole flash sector, which is
"embedded" in the text segment with the U-Boot code. This
happens usually with "bottom boot sector" or "top boot
sector" type flash chips, which have several smaller
sectors at the start or the end. For instance, such a
layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
such a case you would place the environment in one of the
4 kB sectors - with U-Boot code before and after it. With
"top boot sector" type flash chips, you would put the
environment in one of the last sectors, leaving a gap
between U-Boot and the environment.
- CONFIG_ENV_OFFSET:
Offset of environment data (variable area) to the
beginning of flash memory; for instance, with bottom boot
type flash chips the second sector can be used: the offset
for this sector is given here.
CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
- CONFIG_ENV_ADDR:
This is just another way to specify the start address of
the flash sector containing the environment (instead of
CONFIG_ENV_OFFSET).
- CONFIG_ENV_SECT_SIZE:
Size of the sector containing the environment.
b) Sometimes flash chips have few, equal sized, BIG sectors.
In such a case you don't want to spend a whole sector for
the environment.
- CONFIG_ENV_SIZE:
If you use this in combination with CONFIG_ENV_IS_IN_FLASH
and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
of this flash sector for the environment. This saves
memory for the RAM copy of the environment.
It may also save flash memory if you decide to use this
when your environment is "embedded" within U-Boot code,
since then the remainder of the flash sector could be used
for U-Boot code. It should be pointed out that this is
STRONGLY DISCOURAGED from a robustness point of view:
updating the environment in flash makes it always
necessary to erase the WHOLE sector. If something goes
wrong before the contents has been restored from a copy in
RAM, your target system will be dead.
- CONFIG_ENV_ADDR_REDUND
CONFIG_ENV_SIZE_REDUND
These settings describe a second storage area used to hold
a redundant copy of the environment data, so that there is
a valid backup copy in case there is a power failure during
a "saveenv" operation.
BE CAREFUL! Any changes to the flash layout, and some changes to the
source code will make it necessary to adapt <board>/u-boot.lds*
accordingly!
- CONFIG_ENV_IS_IN_NVRAM:
Define this if you have some non-volatile memory device
(NVRAM, battery buffered SRAM) which you want to use for the
environment.
- CONFIG_ENV_ADDR:
- CONFIG_ENV_SIZE:
These two #defines are used to determine the memory area you
want to use for environment. It is assumed that this memory
can just be read and written to, without any special
provision.
BE CAREFUL! The first access to the environment happens quite early
in U-Boot initialization (when we try to get the setting of for the
console baudrate). You *MUST* have mapped your NVRAM area then, or
U-Boot will hang.
Please note that even with NVRAM we still use a copy of the