mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-30 16:13:54 +08:00
acb7386532
The current version is very old and does not correctly specify how to set the video mode. Signed-off by: Adrian McMenamin <adrian@mcmen.demon.co.uk> Signed-off-by: Antonino Daplas <adaplas@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
66 lines
2.2 KiB
Plaintext
66 lines
2.2 KiB
Plaintext
$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 (NOT on the Dreamcast)
|
|
* You can run XF86_FBDev on top of /dev/fb0
|
|
* Most important: boot logo :-)
|
|
|
|
Disadvantages:
|
|
|
|
* Driver is largely untested on non-Dreamcast systems.
|
|
|
|
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 with format [xres]x[yres]-<bpp>@<refresh rate>
|
|
The following video modes are supported:
|
|
640x640-16@60, 640x480-24@60, 640x480-32@60. The Dreamcast
|
|
defaults to 640x480-16@60. At the time of writing the
|
|
24bpp and 32bpp modes function poorly. Work to fix that is
|
|
ongoing
|
|
|
|
Note: the 640x240 mode is currently broken, and should not be
|
|
used for any reason. It is only mentioned here 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 has been shown to work on the Dreamcast in the past - though not yet
|
|
on any 2.6 series kernel.
|
|
|
|
--
|
|
Paul Mundt <lethal@linuxdc.org>
|
|
Updated by Adrian McMenamin <adrian@mcmen.demon.co.uk>
|
|
|