linux/Documentation/fb/vt8623fb.txt
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   2        vt8623fb - fbdev driver for graphics core in VIA VT8623 chipset
   3        ===============================================================
   4
   5
   6Supported Hardware
   7==================
   8
   9        VIA VT8623 [CLE266] chipset and its graphics core
  10                (known as CastleRock or Unichrome)
  11
  12I tested vt8623fb on VIA EPIA ML-6000
  13
  14
  15Supported Features
  16==================
  17
  18        *  4 bpp pseudocolor modes (with 18bit palette, two variants)
  19        *  8 bpp pseudocolor mode (with 18bit palette)
  20        * 16 bpp truecolor mode (RGB 565)
  21        * 32 bpp truecolor mode (RGB 888)
  22        * text mode (activated by bpp = 0)
  23        * doublescan mode variant (not available in text mode)
  24        * panning in both directions
  25        * suspend/resume support
  26        * DPMS support
  27
  28Text mode is supported even in higher resolutions, but there is limitation to
  29lower pixclocks (maximum about 100 MHz). This limitation is not enforced by
  30driver. Text mode supports 8bit wide fonts only (hardware limitation) and
  3116bit tall fonts (driver limitation).
  32
  33There are two 4 bpp modes. First mode (selected if nonstd == 0) is mode with
  34packed pixels, high nibble first. Second mode (selected if nonstd == 1) is mode
  35with interleaved planes (1 byte interleave), MSB first. Both modes support
  368bit wide fonts only (driver limitation).
  37
  38Suspend/resume works on systems that initialize video card during resume and
  39if device is active (for example used by fbcon).
  40
  41
  42Missing Features
  43================
  44(alias TODO list)
  45
  46        * secondary (not initialized by BIOS) device support
  47        * MMIO support
  48        * interlaced mode variant
  49        * support for fontwidths != 8 in 4 bpp modes
  50        * support for fontheight != 16 in text mode
  51        * hardware cursor
  52        * video overlay support
  53        * vsync synchronization
  54        * acceleration support (8514-like 2D, busmaster transfers)
  55
  56
  57Known bugs
  58==========
  59
  60        * cursor disable in text mode doesn't work
  61
  62
  63--
  64Ondrej Zajicek <santiago@crfreenet.org>
  65
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