| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | $Id: pvr2fb.txt,v 1.1 2001/05/24 05:09:16 mrbrown Exp $ |
| 2 | |
| 3 | What is pvr2fb? |
| 4 | =============== |
| 5 | |
| 6 | This is a driver for PowerVR 2 based graphics frame buffers, such as the |
| 7 | one found in the Dreamcast. |
| 8 | |
| 9 | Advantages: |
| 10 | |
| 11 | * It provides a nice large console (128 cols + 48 lines with 1024x768) |
| 12 | without using tiny, unreadable fonts. |
| 13 | * You can run XF86_FBDev on top of /dev/fb0 |
| 14 | * Most important: boot logo :-) |
| 15 | |
| 16 | Disadvantages: |
| 17 | |
| 18 | * Driver is currently limited to the Dreamcast PowerVR 2 implementation |
| 19 | at the time of this writing. |
| 20 | |
| 21 | Configuration |
| 22 | ============= |
| 23 | |
| 24 | You can pass kernel command line options to pvr2fb with |
| 25 | `video=pvr2fb:option1,option2:value2,option3' (multiple options should be |
| 26 | separated by comma, values are separated from options by `:'). |
| 27 | Accepted options: |
| 28 | |
| 29 | font:X - default font to use. All fonts are supported, including the |
| 30 | SUN12x22 font which is very nice at high resolutions. |
| 31 | |
| 32 | mode:X - default video mode. The following video modes are supported: |
| 33 | 640x240-60, 640x480-60. |
| 34 | |
| 35 | Note: the 640x240 mode is currently broken, and should not be |
| 36 | used for any reason. It is only mentioned as a reference. |
| 37 | |
| 38 | inverse - invert colors on screen (for LCD displays) |
| 39 | |
| 40 | nomtrr - disables write combining on frame buffer. This slows down driver |
| 41 | but there is reported minor incompatibility between GUS DMA and |
| 42 | XFree under high loads if write combining is enabled (sound |
| 43 | dropouts). MTRR is enabled by default on systems that have it |
| 44 | configured and that support it. |
| 45 | |
| 46 | cable:X - cable type. This can be any of the following: vga, rgb, and |
| 47 | composite. If none is specified, we guess. |
| 48 | |
| 49 | output:X - output type. This can be any of the following: pal, ntsc, and |
| 50 | vga. If none is specified, we guess. |
| 51 | |
| 52 | X11 |
| 53 | === |
| 54 | |
| 55 | XF86_FBDev should work, in theory. At the time of this writing it is |
| 56 | totally untested and may or may not even portray the beginnings of |
| 57 | working. If you end up testing this, please let me know! |
| 58 | |
| 59 | -- |
| 60 | Paul Mundt <lethal@linuxdc.org> |
| 61 | |