Commit | Line | Data |
---|---|---|
681e1473 OZ |
1 | |
2 | arkfb - fbdev driver for ARK Logic chips | |
3 | ======================================== | |
4 | ||
5 | ||
6 | Supported 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 | ||
16 | Supported 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 | ||
29 | Text mode is supported even in higher resolutions, but there is limitation to | |
30 | lower pixclocks (i got maximum about 70 MHz, it is dependent on specific | |
31 | hardware). This limitation is not enforced by driver. Text mode supports 8bit | |
32 | wide fonts only (hardware limitation) and 16bit tall fonts (driver | |
33 | limitation). Unfortunately character attributes (like color) in text mode are | |
34 | broken for unknown reason, so its usefulness is limited. | |
35 | ||
36 | There are two 4 bpp modes. First mode (selected if nonstd == 0) is mode with | |
37 | packed pixels, high nibble first. Second mode (selected if nonstd == 1) is mode | |
38 | with interleaved planes (1 byte interleave), MSB first. Both modes support | |
39 | 8bit wide fonts only (driver limitation). | |
40 | ||
41 | Suspend/resume works on systems that initialize video card during resume and | |
42 | if device is active (for example used by fbcon). | |
43 | ||
44 | ||
45 | Missing 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 | ||
62 | Known bugs | |
63 | ========== | |
64 | ||
65 | * character attributes (and cursor) in text mode are broken | |
66 | ||
67 | -- | |
68 | Ondrej Zajicek <santiago@crfreenet.org> |