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1===============================================================2vt8623fb - fbdev driver for graphics core in VIA VT8623 chipset3===============================================================4 5 6Supported Hardware7==================8 9VIA VT8623 [CLE266] chipset and its graphics core10(known as CastleRock or Unichrome)11 12I tested vt8623fb on VIA EPIA ML-600013 14 15Supported Features16==================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 directions25 * suspend/resume support26 * DPMS support27 28Text mode is supported even in higher resolutions, but there is limitation to29lower pixclocks (maximum about 100 MHz). This limitation is not enforced by30driver. Text mode supports 8bit wide fonts only (hardware limitation) and3116bit tall fonts (driver limitation).32 33There are two 4 bpp modes. First mode (selected if nonstd == 0) is mode with34packed pixels, high nibble first. Second mode (selected if nonstd == 1) is mode35with interleaved planes (1 byte interleave), MSB first. Both modes support368bit wide fonts only (driver limitation).37 38Suspend/resume works on systems that initialize video card during resume and39if device is active (for example used by fbcon).40 41 42Missing Features43================44(alias TODO list)45 46 * secondary (not initialized by BIOS) device support47 * MMIO support48 * interlaced mode variant49 * support for fontwidths != 8 in 4 bpp modes50 * support for fontheight != 16 in text mode51 * hardware cursor52 * video overlay support53 * vsync synchronization54 * acceleration support (8514-like 2D, busmaster transfers)55 56 57Known bugs58==========59 60 * cursor disable in text mode doesn't work61 62 63--64Ondrej Zajicek <santiago@crfreenet.org>65