| arkfb - fbdev driver for ARK Logic chips | |
| ======================================== | |
| Supported Hardware | |
| ================== | |
| ARK 2000PV chip | |
| ICS 5342 ramdac | |
| - only BIOS initialized VGA devices supported | |
| - probably not working on big endian | |
| Supported Features | |
| ================== | |
| * 4 bpp pseudocolor modes (with 18bit palette, two variants) | |
| * 8 bpp pseudocolor mode (with 18bit palette) | |
| * 16 bpp truecolor modes (RGB 555 and RGB 565) | |
| * 24 bpp truecolor mode (RGB 888) | |
| * 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 | |
| Text mode is supported even in higher resolutions, but there is limitation to | |
| lower pixclocks (i got maximum about 70 MHz, it is dependent on specific | |
| hardware). This limitation is not enforced by driver. Text mode supports 8bit | |
| wide fonts only (hardware limitation) and 16bit tall fonts (driver | |
| limitation). Unfortunately character attributes (like color) in text mode are | |
| broken for unknown reason, so its usefulness is limited. | |
| 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 | |
| * big endian support | |
| * DPMS support | |
| * MMIO support | |
| * interlaced mode variant | |
| * support for fontwidths != 8 in 4 bpp modes | |
| * support for fontheight != 16 in text mode | |
| * hardware cursor | |
| * vsync synchronization | |
| * feature connector support | |
| * acceleration support (8514-like 2D) | |
| Known bugs | |
| ========== | |
| * character attributes (and cursor) in text mode are broken | |
| -- | |
| Ondrej Zajicek <santiago@crfreenet.org> |