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- vt8623fb - fbdev driver for graphics core in VIA VT8623 chipset
- ===============================================================
- Supported Hardware
- ==================
- VIA VT8623 [CLE266] chipset and its graphics core
- (known as CastleRock or Unichrome)
- I tested vt8623fb on VIA EPIA ML-6000
- Supported Features
- ==================
- * 4 bpp pseudocolor modes (with 18bit palette, two variants)
- * 8 bpp pseudocolor mode (with 18bit palette)
- * 16 bpp truecolor mode (RGB 565)
- * 32 bpp truecolor mode (RGB 888)
- * text mode (activated by bpp = 0)
- * doublescan mode variant (not available in text mode)
- * panning in both directions
- * suspend/resume support
- * DPMS support
- Text mode is supported even in higher resolutions, but there is limitation to
- lower pixclocks (maximum about 100 MHz). This limitation is not enforced by
- driver. Text mode supports 8bit wide fonts only (hardware limitation) and
- 16bit tall fonts (driver limitation).
- There are two 4 bpp modes. First mode (selected if nonstd == 0) is mode with
- packed pixels, high nibble first. Second mode (selected if nonstd == 1) is mode
- with interleaved planes (1 byte interleave), MSB first. Both modes support
- 8bit wide fonts only (driver limitation).
- Suspend/resume works on systems that initialize video card during resume and
- if device is active (for example used by fbcon).
- Missing Features
- ================
- (alias TODO list)
- * secondary (not initialized by BIOS) device support
- * MMIO support
- * interlaced mode variant
- * support for fontwidths != 8 in 4 bpp modes
- * support for fontheight != 16 in text mode
- * hardware cursor
- * video overlay support
- * vsync synchronization
- * acceleration support (8514-like 2D, busmaster transfers)
- Known bugs
- ==========
- * cursor disable in text mode doesn't work
- --
- Ondrej Zajicek <santiago@crfreenet.org>
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