| $Id: pvr2fb.txt,v 1.1 2001/05/24 05:09:16 mrbrown Exp $ |
| |
| What is pvr2fb? |
| =============== |
| |
| This is a driver for PowerVR 2 based graphics frame buffers, such as the |
| one found in the Dreamcast. |
| |
| Advantages: |
| |
| * It provides a nice large console (128 cols + 48 lines with 1024x768) |
| without using tiny, unreadable fonts (NOT on the Dreamcast) |
| * You can run XF86_FBDev on top of /dev/fb0 |
| * Most important: boot logo :-) |
| |
| Disadvantages: |
| |
| * Driver is largely untested on non-Dreamcast systems. |
| |
| Configuration |
| ============= |
| |
| You can pass kernel command line options to pvr2fb with |
| `video=pvr2fb:option1,option2:value2,option3' (multiple options should be |
| separated by comma, values are separated from options by `:'). |
| Accepted options: |
| |
| font:X - default font to use. All fonts are supported, including the |
| SUN12x22 font which is very nice at high resolutions. |
| |
| |
| mode:X - default video mode with format [xres]x[yres]-<bpp>@<refresh rate> |
| The following video modes are supported: |
| 640x640-16@60, 640x480-24@60, 640x480-32@60. The Dreamcast |
| defaults to 640x480-16@60. At the time of writing the |
| 24bpp and 32bpp modes function poorly. Work to fix that is |
| ongoing |
| |
| Note: the 640x240 mode is currently broken, and should not be |
| used for any reason. It is only mentioned here as a reference. |
| |
| inverse - invert colors on screen (for LCD displays) |
| |
| nomtrr - disables write combining on frame buffer. This slows down driver |
| but there is reported minor incompatibility between GUS DMA and |
| XFree under high loads if write combining is enabled (sound |
| dropouts). MTRR is enabled by default on systems that have it |
| configured and that support it. |
| |
| cable:X - cable type. This can be any of the following: vga, rgb, and |
| composite. If none is specified, we guess. |
| |
| output:X - output type. This can be any of the following: pal, ntsc, and |
| vga. If none is specified, we guess. |
| |
| X11 |
| === |
| |
| XF86_FBDev has been shown to work on the Dreamcast in the past - though not yet |
| on any 2.6 series kernel. |
| |
| -- |
| Paul Mundt <lethal@linuxdc.org> |
| Updated by Adrian McMenamin <adrian@mcmen.demon.co.uk> |
| |
