From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- Documentation/fb/aty128fb.txt | 72 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100644 Documentation/fb/aty128fb.txt (limited to 'Documentation/fb/aty128fb.txt') diff --git a/Documentation/fb/aty128fb.txt b/Documentation/fb/aty128fb.txt new file mode 100644 index 000000000..b605204fc --- /dev/null +++ b/Documentation/fb/aty128fb.txt @@ -0,0 +1,72 @@ +[This file is cloned from VesaFB/matroxfb] + +What is aty128fb? +================= + +This is a driver for a graphic framebuffer for ATI Rage128 based devices +on Intel and PPC boxes. + +Advantages: + + * It provides a nice large console (128 cols + 48 lines with 1024x768) + without using tiny, unreadable fonts. + * You can run XF68_FBDev on top of /dev/fb0 + * Most important: boot logo :-) + +Disadvantages: + + * graphic mode is slower than text mode... but you should not notice + if you use same resolution as you used in textmode. + * still experimental. + + +How to use it? +============== + +Switching modes is done using the video=aty128fb:... modedb +boot parameter or using `fbset' program. + +See Documentation/fb/modedb.txt for more information on modedb +resolutions. + +You should compile in both vgacon (to boot if you remove your Rage128 from +box) and aty128fb (for graphics mode). You should not compile-in vesafb +unless you have primary display on non-Rage128 VBE2.0 device (see +Documentation/fb/vesafb.txt for details). + + +X11 +=== + +XF68_FBDev should generally work fine, but it is non-accelerated. As of +this document, 8 and 32bpp works fine. There have been palette issues +when switching from X to console and back to X. You will have to restart +X to fix this. + + +Configuration +============= + +You can pass kernel command line options to vesafb with +`video=aty128fb:option1,option2:value2,option3' (multiple options should +be separated by comma, values are separated from options by `:'). +Accepted options: + +noaccel - do not use acceleration engine. It is default. +accel - use acceleration engine. Not finished. +vmode:x - chooses PowerMacintosh video mode . Deprecated. +cmode:x - chooses PowerMacintosh colour mode . Deprecated. + - selects startup videomode. See modedb.txt for detailed + explanation. Default is 640x480x8bpp. + + +Limitations +=========== + +There are known and unknown bugs, features and misfeatures. +Currently there are following known bugs: + + This driver is still experimental and is not finished. Too many + bugs/errata to list here. + +-- +Brad Douglas -- cgit v1.2.3