s3fb.txt 2.4 KB

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