linux/Documentation/fb/arkfb.txt
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   2        arkfb - fbdev driver for ARK Logic chips
   3        ========================================
   4
   5
   6Supported Hardware
   7==================
   8
   9        ARK 2000PV chip
  10        ICS 5342 ramdac
  11
  12        - only BIOS initialized VGA devices supported
  13        - probably not working on big endian
  14
  15
  16Supported Features
  17==================
  18
  19        *  4 bpp pseudocolor modes (with 18bit palette, two variants)
  20        *  8 bpp pseudocolor mode (with 18bit palette)
  21        * 16 bpp truecolor modes (RGB 555 and RGB 565)
  22        * 24 bpp truecolor mode (RGB 888)
  23        * 32 bpp truecolor mode (RGB 888)
  24        * text mode (activated by bpp = 0)
  25        * doublescan mode variant (not available in text mode)
  26        * panning in both directions
  27        * suspend/resume support
  28
  29Text mode is supported even in higher resolutions, but there is limitation to
  30lower pixclocks (i got maximum about 70 MHz, it is dependent on specific
  31hardware). This limitation is not enforced by driver. Text mode supports 8bit
  32wide fonts only (hardware limitation) and 16bit tall fonts (driver
  33limitation). Unfortunately character attributes (like color) in text mode are
  34broken for unknown reason, so its usefulness is limited.
  35
  36There are two 4 bpp modes. First mode (selected if nonstd == 0) is mode with
  37packed pixels, high nibble first. Second mode (selected if nonstd == 1) is mode
  38with interleaved planes (1 byte interleave), MSB first. Both modes support
  398bit wide fonts only (driver limitation).
  40
  41Suspend/resume works on systems that initialize video card during resume and
  42if device is active (for example used by fbcon).
  43
  44
  45Missing Features
  46================
  47(alias TODO list)
  48
  49        * secondary (not initialized by BIOS) device support
  50        * big endian support
  51        * DPMS support
  52        * MMIO support
  53        * interlaced mode variant
  54        * support for fontwidths != 8 in 4 bpp modes
  55        * support for fontheight != 16 in text mode
  56        * hardware cursor
  57        * vsync synchronization
  58        * feature connector support
  59        * acceleration support (8514-like 2D)
  60
  61
  62Known bugs
  63==========
  64
  65        * character attributes (and cursor) in text mode are broken
  66
  67--
  68Ondrej Zajicek <santiago@crfreenet.org>
  69
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