linux/Documentation/fb/gxfb.rst
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   1=============
   2What is gxfb?
   3=============
   4
   5.. [This file is cloned from VesaFB/aty128fb]
   6
   7This is a graphics framebuffer driver for AMD Geode GX2 based processors.
   8
   9Advantages:
  10
  11 * No need to use AMD's VSA code (or other VESA emulation layer) in the
  12   BIOS.
  13 * It provides a nice large console (128 cols + 48 lines with 1024x768)
  14   without using tiny, unreadable fonts.
  15 * You can run XF68_FBDev on top of /dev/fb0
  16 * Most important: boot logo :-)
  17
  18Disadvantages:
  19
  20 * graphic mode is slower than text mode...
  21
  22
  23How to use it?
  24==============
  25
  26Switching modes is done using  gxfb.mode_option=<resolution>... boot
  27parameter or using `fbset` program.
  28
  29See Documentation/fb/modedb.rst for more information on modedb
  30resolutions.
  31
  32
  33X11
  34===
  35
  36XF68_FBDev should generally work fine, but it is non-accelerated.
  37
  38
  39Configuration
  40=============
  41
  42You can pass kernel command line options to gxfb with gxfb.<option>.
  43For example, gxfb.mode_option=800x600@75.
  44Accepted options:
  45
  46================ ==================================================
  47mode_option      specify the video mode.  Of the form
  48                 <x>x<y>[-<bpp>][@<refresh>]
  49vram             size of video ram (normally auto-detected)
  50vt_switch        enable vt switching during suspend/resume.  The vt
  51                 switch is slow, but harmless.
  52================ ==================================================
  53
  54Andres Salomon <dilinger@debian.org>
  55