arkfb.rst 2.0 KB

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  1. ========================================
  2. arkfb - fbdev driver for ARK Logic chips
  3. ========================================
  4. Supported Hardware
  5. ==================
  6. ARK 2000PV chip
  7. ICS 5342 ramdac
  8. - only BIOS initialized VGA devices supported
  9. - probably not working on big endian
  10. Supported Features
  11. ==================
  12. * 4 bpp pseudocolor modes (with 18bit palette, two variants)
  13. * 8 bpp pseudocolor mode (with 18bit palette)
  14. * 16 bpp truecolor modes (RGB 555 and RGB 565)
  15. * 24 bpp truecolor mode (RGB 888)
  16. * 32 bpp truecolor mode (RGB 888)
  17. * text mode (activated by bpp = 0)
  18. * doublescan mode variant (not available in text mode)
  19. * panning in both directions
  20. * suspend/resume support
  21. Text mode is supported even in higher resolutions, but there is limitation to
  22. lower pixclocks (i got maximum about 70 MHz, it is dependent on specific
  23. hardware). This limitation is not enforced by driver. Text mode supports 8bit
  24. wide fonts only (hardware limitation) and 16bit tall fonts (driver
  25. limitation). Unfortunately character attributes (like color) in text mode are
  26. broken for unknown reason, so its usefulness is limited.
  27. There are two 4 bpp modes. First mode (selected if nonstd == 0) is mode with
  28. packed pixels, high nibble first. Second mode (selected if nonstd == 1) is mode
  29. with interleaved planes (1 byte interleave), MSB first. Both modes support
  30. 8bit wide fonts only (driver limitation).
  31. Suspend/resume works on systems that initialize video card during resume and
  32. if device is active (for example used by fbcon).
  33. Missing Features
  34. ================
  35. (alias TODO list)
  36. * secondary (not initialized by BIOS) device support
  37. * big endian support
  38. * DPMS support
  39. * MMIO support
  40. * interlaced mode variant
  41. * support for fontwidths != 8 in 4 bpp modes
  42. * support for fontheight != 16 in text mode
  43. * hardware cursor
  44. * vsync synchronization
  45. * feature connector support
  46. * acceleration support (8514-like 2D)
  47. Known bugs
  48. ==========
  49. * character attributes (and cursor) in text mode are broken
  50. --
  51. Ondrej Zajicek <santiago@crfreenet.org>