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
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