pvr2fb.rst 2.2 KB

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