tgafb.rst 2.5 KB

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  1. ==============
  2. What is tgafb?
  3. ==============
  4. This is a driver for DECChip 21030 based graphics framebuffers, a.k.a. TGA
  5. cards, which are usually found in older Digital Alpha systems. The
  6. following models are supported:
  7. - ZLxP-E1 (8bpp, 2 MB VRAM)
  8. - ZLxP-E2 (32bpp, 8 MB VRAM)
  9. - ZLxP-E3 (32bpp, 16 MB VRAM, Zbuffer)
  10. This version is an almost complete rewrite of the code written by Geert
  11. Uytterhoeven, which was based on the original TGA console code written by
  12. Jay Estabrook.
  13. Major new features since Linux 2.0.x:
  14. * Support for multiple resolutions
  15. * Support for fixed-frequency and other oddball monitors
  16. (by allowing the video mode to be set at boot time)
  17. User-visible changes since Linux 2.2.x:
  18. * Sync-on-green is now handled properly
  19. * More useful information is printed on bootup
  20. (this helps if people run into problems)
  21. This driver does not (yet) support the TGA2 family of framebuffers, so the
  22. PowerStorm 3D30/4D20 (also known as PBXGB) cards are not supported. These
  23. can however be used with the standard VGA Text Console driver.
  24. Configuration
  25. =============
  26. You can pass kernel command line options to tgafb with
  27. `video=tgafb:option1,option2:value2,option3` (multiple options should be
  28. separated by comma, values are separated from options by `:`).
  29. Accepted options:
  30. ========== ============================================================
  31. font:X default font to use. All fonts are supported, including the
  32. SUN12x22 font which is very nice at high resolutions.
  33. mode:X default video mode. The following video modes are supported:
  34. 640x480-60, 800x600-56, 640x480-72, 800x600-60, 800x600-72,
  35. 1024x768-60, 1152x864-60, 1024x768-70, 1024x768-76,
  36. 1152x864-70, 1280x1024-61, 1024x768-85, 1280x1024-70,
  37. 1152x864-84, 1280x1024-76, 1280x1024-85
  38. ========== ============================================================
  39. Known Issues
  40. ============
  41. The XFree86 FBDev server has been reported not to work, since tgafb doesn't do
  42. mmap(). Running the standard XF86_TGA server from XFree86 3.3.x works fine for
  43. me, however this server does not do acceleration, which make certain operations
  44. quite slow. Support for acceleration is being progressively integrated in
  45. XFree86 4.x.
  46. When running tgafb in resolutions higher than 640x480, on switching VCs from
  47. tgafb to XF86_TGA 3.3.x, the entire screen is not re-drawn and must be manually
  48. refreshed. This is an X server problem, not a tgafb problem, and is fixed in
  49. XFree86 4.0.
  50. Enjoy!
  51. Martin Lucina <mato@kotelna.sk>