s3fb.rst 2.6 KB

12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182
  1. ===========================================
  2. s3fb - fbdev driver for S3 Trio/Virge chips
  3. ===========================================
  4. Supported Hardware
  5. ==================
  6. S3 Trio32
  7. S3 Trio64 (and variants V+, UV+, V2/DX, V2/GX)
  8. S3 Virge (and variants VX, DX, GX and GX2+)
  9. S3 Plato/PX (completely untested)
  10. S3 Aurora64V+ (completely untested)
  11. - only PCI bus supported
  12. - only BIOS initialized VGA devices supported
  13. - probably not working on big endian
  14. I tested s3fb on Trio64 (plain, V+ and V2/DX) and Virge (plain, VX, DX),
  15. all on i386.
  16. Supported Features
  17. ==================
  18. * 4 bpp pseudocolor modes (with 18bit palette, two variants)
  19. * 8 bpp pseudocolor mode (with 18bit palette)
  20. * 16 bpp truecolor modes (RGB 555 and RGB 565)
  21. * 24 bpp truecolor mode (RGB 888) on (only on Virge VX)
  22. * 32 bpp truecolor mode (RGB 888) on (not on Virge VX)
  23. * text mode (activated by bpp = 0)
  24. * interlaced mode variant (not available in text mode)
  25. * doublescan mode variant (not available in text mode)
  26. * panning in both directions
  27. * suspend/resume support
  28. * DPMS support
  29. Text mode is supported even in higher resolutions, but there is limitation to
  30. lower pixclocks (maximum usually between 50-60 MHz, depending on specific
  31. hardware, i get best results from plain S3 Trio32 card - about 75 MHz). This
  32. limitation is not enforced by driver. Text mode supports 8bit wide fonts only
  33. (hardware limitation) and 16bit tall fonts (driver limitation). Text mode
  34. support is broken on S3 Trio64 V2/DX.
  35. There are two 4 bpp modes. First mode (selected if nonstd == 0) is mode with
  36. packed pixels, high nibble first. Second mode (selected if nonstd == 1) is mode
  37. with interleaved planes (1 byte interleave), MSB first. Both modes support
  38. 8bit wide fonts only (driver limitation).
  39. Suspend/resume works on systems that initialize video card during resume and
  40. if device is active (for example used by fbcon).
  41. Missing Features
  42. ================
  43. (alias TODO list)
  44. * secondary (not initialized by BIOS) device support
  45. * big endian support
  46. * Zorro bus support
  47. * MMIO support
  48. * 24 bpp mode support on more cards
  49. * support for fontwidths != 8 in 4 bpp modes
  50. * support for fontheight != 16 in text mode
  51. * composite and external sync (is anyone able to test this?)
  52. * hardware cursor
  53. * video overlay support
  54. * vsync synchronization
  55. * feature connector support
  56. * acceleration support (8514-like 2D, Virge 3D, busmaster transfers)
  57. * better values for some magic registers (performance issues)
  58. Known bugs
  59. ==========
  60. * cursor disable in text mode doesn't work
  61. * text mode broken on S3 Trio64 V2/DX
  62. --
  63. Ondrej Zajicek <santiago@crfreenet.org>