| # |
| # Copyright (c) 2010-2012 Nest Labs, Inc. |
| # All rights reserved. |
| # |
| # This document is the property of Nest. It is considered |
| # confidential and proprietary information. |
| # |
| # This document may not be reproduced or transmitted in any form, |
| # in whole or in part, without the express written permission of |
| # Nest. |
| # |
| # Description: |
| # This file is the makefile for the Linux kernel. |
| # |
| |
| include pre.mak |
| |
| PackageRoot := . |
| |
| PackageName := linux |
| |
| PackageSeparator := |
| |
| PackageSourceDir := $(PackageRoot)/$(PackageName) |
| |
| PackageBuildConfig := $(call GenerateBuildPaths,.config) |
| PackageBuildMakefile := $(call GenerateBuildPaths,Makefile) |
| |
| CleanPaths += $(PackageLicenseFile) |
| |
| # |
| # Configuration |
| # |
| # Kernel default configuration is handled from most-specific to |
| # least-specific, as follows: |
| # |
| # Out-of-tree: |
| # |
| # 1) If configs/$(BuildProduct)/$(BuildConfig)_defconfig exists, |
| # it is used. |
| # 2) If configs/$(BuildProduct)/defconfig exists, it is used. |
| # 3) If configs/$(BuildConfig)_defconfig exists, it is used. |
| # 4) If configs/defconfig exists, it is used. |
| # |
| # In-tree: |
| # |
| # 5) If none of those exist, $(LinuxDefaultConfig) is used, which |
| # refers to an architecture- and/or board-specific default |
| # configuration. |
| # |
| # We go through this elaborate scheme because, once created, the |
| # kernel loses all association with it configuration file and the |
| # source it was created from. As a consequence, if the default |
| # configuration is edited, the kernel doesn't know about the |
| # change. This is especially problematic when changing branches or |
| # receiving updates to the default configuration and the kernel |
| # doesn't rebuild to reflect those changes. |
| # |
| # With this scheme, the user can edit .config as before. However, now |
| # if the default configuration is changed, out-of-tree only, .config |
| # is updated and the kernel will rebuild to reflect those changes. |
| # |
| |
| PackageConfigDir := configs |
| PackageDefaultConfig := $(LinuxDefaultConfig) |
| PackageProjectConfig := $(PackageConfigDir)/defconfig |
| PackageConfigConfig := $(PackageConfigDir)/$(BuildConfig)_defconfig |
| PackageProductConfig := $(PackageConfigDir)/$(BuildProduct)/defconfig |
| PackageProductConfigConfig := $(PackageConfigDir)/$(BuildProduct)/$(BuildConfig)_defconfig |
| |
| PackageMaybeProjectConfig := $(wildcard $(PackageProjectConfig)) |
| PackageMaybeConfigConfig := $(wildcard $(PackageConfigConfig)) |
| PackageMaybeProductConfig := $(wildcard $(PackageProductConfig)) |
| PackageMaybeProductConfigConfig := $(wildcard $(PackageProductConfigConfig)) |
| |
| PackageMaybeConfig := $(if $(PackageMaybeProductConfigConfig),$(PackageProductConfigConfig),$(if $(PackageMaybeProductConfig),$(PackageProductConfig),$(if $(PackageMaybeConfigConfig),$(PackageConfigConfig),$(if $(PackageMaybeProjectConfig),$(PackageProjectConfig),)))) |
| |
| PackageSourceConfig := $(if $(PackageMaybeConfig),$(PackageMaybeConfig),) |
| |
| # |
| # Specific products may want additional build targets beyond those |
| # produced by the linux build's 'all' target. Process and establish |
| # those. |
| # |
| |
| LinuxAllTarget := all |
| LinuxBuildTargets := $(filter-out $(LinuxAllTarget),$(LinuxProductTargets)) $(LinuxAllTarget) |
| |
| # |
| # For some architectures, the linux build requires u-boot's host |
| # 'mkimage' tool. Establish some paths and directories that will be |
| # used, if present, to help the linux build find it. |
| # |
| |
| MkimagePath := $(wildcard $(call GenerateResultPaths,fw/u-boot/bin,mkimage)) |
| MkimageDir := $(call Deslashify,$(dir $(MkimagePath))) |
| |
| # |
| # Architecture-specific boot images that may need to be copied from |
| # the build to the result directory. |
| # |
| |
| LinuxBootFolder = arch/$(LinuxProductArch)/boot |
| LinuxBootDir = $(call GenerateBuildPaths,$(LinuxBootFolder)) |
| LinuxBootBuildPaths = $(call GenerateBuildPaths,$(addprefix $(LinuxBootFolder)/,$(LinuxProductBootFiles))) |
| LinuxBootResultPaths = $(call GenerateResultPaths,,$(notdir $(LinuxBootBuildPaths))) |
| |
| LinuxKernelFiles = vmlinux |
| LinuxKernelFolder = . |
| LinuxKernelDir = $(call GenerateBuildPaths,$(LinuxKernelFolder)) |
| LinuxKernelBuildPaths = $(call GenerateBuildPaths,$(addprefix $(call Slashify,$(LinuxKernelFolder)),$(LinuxKernelFiles))) |
| LinuxKernelResultPaths = $(call GenerateResultPaths,,$(notdir $(LinuxKernelBuildPaths))) |
| |
| # |
| # Common make arguments shared by all Linux target commands |
| # |
| |
| LinuxCommonMakeArgs = -C $(PackageSourceDir) O=$(CURDIR)/$(BuildDirectory) ARCH=$(LinuxProductArch) |
| |
| define echo-defconfig |
| $(Echo) "The default Linux build configuration is \"$(if $(PackageSourceConfig),$(PackageSourceConfig),$(PackageDefaultConfig))\"." |
| endef |
| |
| all: $(PackageDefaultGoal) |
| |
| # Generate the package license contents. |
| |
| $(PackageSourceDir)/COPYING: source |
| |
| $(PackageLicenseFile): $(PackageSourceDir)/COPYING |
| $(copy-result) |
| |
| # We are building this package from version-controller source, so |
| # there is nothing to do for this target goal. |
| |
| $(PackageSourceDir): |
| |
| # Prepare the sources. |
| |
| .PHONY: source |
| source: | $(PackageSourceDir) |
| |
| # Patch the sources, if necessary. |
| |
| .PHONY: patch |
| patch: source |
| |
| # The Linux kernel build has no way of explicitly setting CC, LD, |
| # OBJCOPY, et al and instead relies on the value of |
| # CROSS_COMPILE. Consequently, we have to ensure that 'ToolBinDir' is |
| # in 'PATH' so that the kernel build infrastructure can find |
| # $(CROSS_COMPILE)gcc, $(CROSS_COMPILE)ld, et al. |
| # |
| # Additionally, per the above, add the path to U-Boot's 'mkimage' if |
| # the variable is defined. |
| |
| configure build images stage stage-modules: PATH := $(PATH):$(ToolBinDir)$(if $(MkimageDir),:$(MkimageDir),) |
| |
| # Generate the Linux build configuration and make file |
| # |
| # We are either copying and out-of-tree configuration or using an |
| # in-tree default (see above). |
| |
| # $(PackageBuildConfig): help-defconfig |
| |
| $(PackageBuildConfig): $(PackageSourceConfig) | $(PackageSourceDir) $(BuildDirectory) |
| $(echo-defconfig) |
| $(if $(PackageSourceConfig),$(copy-result),$(Verbose)$(MAKE) $(LinuxCommonMakeArgs) $(LinuxDefaultConfig)) |
| |
| # Configure the source for building. |
| |
| .PHONY: configure |
| configure: source $(PackageBuildConfig) |
| |
| # Build the source. |
| |
| .PHONY: build |
| build: configure images |
| |
| # Build the linux kernel images, including vmlinux (ELF). |
| |
| .PHONY: images |
| images: configure | $(BuildDirectory) |
| $(Verbose)$(MAKE) $(LinuxCommonMakeArgs) $(LinuxBuildTargets) |
| |
| # Stage the build to a temporary installation area. |
| |
| .PHONY: stage stage-boot stage-modules stage-headers |
| stage: stage-boot stage-modules stage-headers |
| |
| stage-boot stage-modules stage-headers: build | $(ResultDirectory) |
| |
| stage-modules: |
| $(Verbose)$(MAKE) $(LinuxCommonMakeArgs) INSTALL_MOD_PATH=$(ResultDirectory) DEPMOD=$(DEPMOD) modules_install |
| |
| stage-headers: |
| $(Verbose)$(MAKE) $(LinuxCommonMakeArgs) INSTALL_HDR_PATH=$(ResultDirectory) headers_install |
| |
| $(LinuxBootResultPaths): $(ResultDirectory)/%: $(LinuxBootDir)/% |
| $(copy-result) |
| |
| $(LinuxKernelResultPaths): $(ResultDirectory)/%: $(LinuxKernelDir)/% |
| $(copy-result) |
| |
| stage-boot: $(LinuxBootResultPaths) $(LinuxKernelResultPaths) |
| |
| clean: |
| $(Verbose)$(RM) $(RMFLAGS) -r $(BuildDirectory) |
| $(Verbose)$(RM) $(RMFLAGS) -r $(ResultDirectory) |
| |
| .PHONY: help help-defconfig |
| help-defconfig: |
| $(echo-defconfig) |
| |
| help: help-defconfig |
| |
| include post.mak |
