linux/Documentation/fb/pvr2fb.txt
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   1$Id: pvr2fb.txt,v 1.1 2001/05/24 05:09:16 mrbrown Exp $
   2
   3What is pvr2fb?
   4===============
   5
   6This is a driver for PowerVR 2 based graphics frame buffers, such as the
   7one found in the Dreamcast.
   8
   9Advantages:
  10
  11 * It provides a nice large console (128 cols + 48 lines with 1024x768)
  12   without using tiny, unreadable fonts (NOT on the Dreamcast)
  13 * You can run XF86_FBDev on top of /dev/fb0
  14 * Most important: boot logo :-)
  15
  16Disadvantages:
  17
  18 * Driver is largely untested on non-Dreamcast systems.
  19
  20Configuration
  21=============
  22
  23You can pass kernel command line options to pvr2fb with
  24`video=pvr2fb:option1,option2:value2,option3' (multiple options should be
  25separated by comma, values are separated from options by `:').
  26Accepted options:
  27
  28font:X    - default font to use. All fonts are supported, including the
  29            SUN12x22 font which is very nice at high resolutions.
  30
  31            
  32mode:X    - default video mode with format [xres]x[yres]-<bpp>@<refresh rate>
  33            The following video modes are supported:
  34            640x640-16@60, 640x480-24@60, 640x480-32@60. The Dreamcast
  35            defaults to 640x480-16@60. At the time of writing the
  36            24bpp and 32bpp modes function poorly. Work to fix that is
  37            ongoing
  38
  39            Note: the 640x240 mode is currently broken, and should not be
  40            used for any reason. It is only mentioned here as a reference.
  41
  42inverse   - invert colors on screen (for LCD displays)
  43
  44nomtrr    - disables write combining on frame buffer. This slows down driver
  45            but there is reported minor incompatibility between GUS DMA and
  46            XFree under high loads if write combining is enabled (sound
  47            dropouts). MTRR is enabled by default on systems that have it
  48            configured and that support it.
  49
  50cable:X   - cable type. This can be any of the following: vga, rgb, and
  51            composite. If none is specified, we guess.
  52
  53output:X  - output type. This can be any of the following: pal, ntsc, and
  54            vga. If none is specified, we guess.
  55
  56X11
  57===
  58
  59XF86_FBDev has been shown to work on the Dreamcast in the past - though not yet
  60on any 2.6 series kernel.
  61
  62--
  63Paul Mundt <lethal@linuxdc.org>
  64Updated by Adrian McMenamin <adrian@mcmen.demon.co.uk>
  65
  66
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