linux/Documentation/fb/pvr2fb.rst
<<
>>
Prefs
   1===============
   2What is pvr2fb?
   3===============
   4
   5This is a driver for PowerVR 2 based graphics frame buffers, such as the
   6one found in the Dreamcast.
   7
   8Advantages:
   9
  10 * It provides a nice large console (128 cols + 48 lines with 1024x768)
  11   without using tiny, unreadable fonts (NOT on the Dreamcast)
  12 * You can run XF86_FBDev on top of /dev/fb0
  13 * Most important: boot logo :-)
  14
  15Disadvantages:
  16
  17 * Driver is largely untested on non-Dreamcast systems.
  18
  19Configuration
  20=============
  21
  22You can pass kernel command line options to pvr2fb with
  23`video=pvr2fb:option1,option2:value2,option3` (multiple options should be
  24separated by comma, values are separated from options by `:`).
  25
  26Accepted options:
  27
  28==========  ==================================================================
  29font:X      default font to use. All fonts are supported, including the
  30            SUN12x22 font which is very nice at high resolutions.
  31
  32
  33mode:X      default video mode with format [xres]x[yres]-<bpp>@<refresh rate>
  34            The following video modes are supported:
  35            640x640-16@60, 640x480-24@60, 640x480-32@60. The Dreamcast
  36            defaults to 640x480-16@60. At the time of writing the
  37            24bpp and 32bpp modes function poorly. Work to fix that is
  38            ongoing
  39
  40            Note: the 640x240 mode is currently broken, and should not be
  41            used for any reason. It is only mentioned here as a reference.
  42
  43inverse     invert colors on screen (for LCD displays)
  44
  45nomtrr      disables write combining on frame buffer. This slows down driver
  46            but there is reported minor incompatibility between GUS DMA and
  47            XFree under high loads if write combining is enabled (sound
  48            dropouts). MTRR is enabled by default on systems that have it
  49            configured and that support it.
  50
  51cable:X     cable type. This can be any of the following: vga, rgb, and
  52            composite. If none is specified, we guess.
  53
  54output:X    output type. This can be any of the following: pal, ntsc, and
  55            vga. If none is specified, we guess.
  56==========  ==================================================================
  57
  58X11
  59===
  60
  61XF86_FBDev has been shown to work on the Dreamcast in the past - though not yet
  62on any 2.6 series kernel.
  63
  64Paul Mundt <lethal@linuxdc.org>
  65
  66Updated by Adrian McMenamin <adrian@mcmen.demon.co.uk>
  67