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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 |