1da177e4c3
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!
61 lines
2 KiB
Text
61 lines
2 KiB
Text
$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.
|
|
* You can run XF86_FBDev on top of /dev/fb0
|
|
* Most important: boot logo :-)
|
|
|
|
Disadvantages:
|
|
|
|
* Driver is currently limited to the Dreamcast PowerVR 2 implementation
|
|
at the time of this writing.
|
|
|
|
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. The following video modes are supported:
|
|
640x240-60, 640x480-60.
|
|
|
|
Note: the 640x240 mode is currently broken, and should not be
|
|
used for any reason. It is only mentioned 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 should work, in theory. At the time of this writing it is
|
|
totally untested and may or may not even portray the beginnings of
|
|
working. If you end up testing this, please let me know!
|
|
|
|
--
|
|
Paul Mundt <lethal@linuxdc.org>
|
|
|