linux/Documentation/fb/aty128fb.txt
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   1[This file is cloned from VesaFB/matroxfb]
   2
   3What is aty128fb?
   4=================
   5
   6This is a driver for a graphic framebuffer for ATI Rage128 based devices
   7on Intel and PPC boxes.
   8
   9Advantages:
  10
  11 * It provides a nice large console (128 cols + 48 lines with 1024x768)
  12   without using tiny, unreadable fonts.
  13 * You can run XF68_FBDev on top of /dev/fb0
  14 * Most important: boot logo :-)
  15
  16Disadvantages:
  17
  18 * graphic mode is slower than text mode... but you should not notice
  19   if you use same resolution as you used in textmode.
  20 * still experimental.
  21
  22
  23How to use it?
  24==============
  25
  26Switching modes is done using the  video=aty128fb:<resolution>... modedb
  27boot parameter or using `fbset' program.
  28
  29See Documentation/fb/modedb.txt for more information on modedb
  30resolutions.
  31
  32You should compile in both vgacon (to boot if you remove your Rage128 from
  33box) and aty128fb (for graphics mode). You should not compile-in vesafb
  34unless you have primary display on non-Rage128 VBE2.0 device (see 
  35Documentation/fb/vesafb.txt for details).
  36
  37
  38X11
  39===
  40
  41XF68_FBDev should generally work fine, but it is non-accelerated. As of
  42this document, 8 and 32bpp works fine.  There have been palette issues
  43when switching from X to console and back to X.  You will have to restart
  44X to fix this.
  45
  46
  47Configuration
  48=============
  49
  50You can pass kernel command line options to vesafb with
  51`video=aty128fb:option1,option2:value2,option3' (multiple options should
  52be separated by comma, values are separated from options by `:'). 
  53Accepted options:
  54
  55noaccel  - do not use acceleration engine. It is default.
  56accel    - use acceleration engine. Not finished.
  57vmode:x  - chooses PowerMacintosh video mode <x>. Deprecated.
  58cmode:x  - chooses PowerMacintosh colour mode <x>. Deprecated.
  59<XxX@X>  - selects startup videomode. See modedb.txt for detailed
  60           explanation. Default is 640x480x8bpp.
  61
  62
  63Limitations
  64===========
  65
  66There are known and unknown bugs, features and misfeatures.
  67Currently there are following known bugs:
  68 + This driver is still experimental and is not finished.  Too many
  69   bugs/errata to list here.
  70
  71--
  72Brad Douglas <brad@neruo.com>
  73
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