diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /Documentation/fb/pvr2fb.txt |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
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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 | |||