1 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