1 =============================================================== 2 vt8623fb - fbdev driver for graphics core in VIA VT8623 chipset 3 =============================================================== 4 5 6 Supported Hardware 7 ================== 8 9 VIA VT8623 [CLE266] chipset and its graphics core 10 (known as CastleRock or Unichrome) 11 12 I tested vt8623fb on VIA EPIA ML-6000 13 14 15 Supported 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 28 Text mode is supported even in higher resolutions, but there is limitation to 29 lower pixclocks (maximum about 100 MHz). This limitation is not enforced by 30 driver. Text mode supports 8bit wide fonts only (hardware limitation) and 31 16bit tall fonts (driver limitation). 32 33 There are two 4 bpp modes. First mode (selected if nonstd == 0) is mode with 34 packed pixels, high nibble first. Second mode (selected if nonstd == 1) is mode 35 with interleaved planes (1 byte interleave), MSB first. Both modes support 36 8bit wide fonts only (driver limitation). 37 38 Suspend/resume works on systems that initialize video card during resume and 39 if device is active (for example used by fbcon). 40 41 42 Missing 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 57 Known bugs 58 ========== 59 60 * cursor disable in text mode doesn't work 61 62 63 -- 64 Ondrej Zajicek <santiago@crfreenet.org>
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