1 ======================================== 1 ========================================
2 arkfb - fbdev driver for ARK Logic chips 2 arkfb - fbdev driver for ARK Logic chips
3 ======================================== 3 ========================================
4 4
5 5
6 Supported Hardware 6 Supported Hardware
7 ================== 7 ==================
8 8
9 ARK 2000PV chip 9 ARK 2000PV chip
10 ICS 5342 ramdac 10 ICS 5342 ramdac
11 11
12 - only BIOS initialized VGA devices su 12 - only BIOS initialized VGA devices supported
13 - probably not working on big endian 13 - probably not working on big endian
14 14
15 15
16 Supported Features 16 Supported Features
17 ================== 17 ==================
18 18
19 * 4 bpp pseudocolor modes (with 18bit 19 * 4 bpp pseudocolor modes (with 18bit palette, two variants)
20 * 8 bpp pseudocolor mode (with 18bit 20 * 8 bpp pseudocolor mode (with 18bit palette)
21 * 16 bpp truecolor modes (RGB 555 and 21 * 16 bpp truecolor modes (RGB 555 and RGB 565)
22 * 24 bpp truecolor mode (RGB 888) 22 * 24 bpp truecolor mode (RGB 888)
23 * 32 bpp truecolor mode (RGB 888) 23 * 32 bpp truecolor mode (RGB 888)
24 * text mode (activated by bpp = 0) 24 * text mode (activated by bpp = 0)
25 * doublescan mode variant (not availab 25 * doublescan mode variant (not available in text mode)
26 * panning in both directions 26 * panning in both directions
27 * suspend/resume support 27 * suspend/resume support
28 28
29 Text mode is supported even in higher resoluti 29 Text mode is supported even in higher resolutions, but there is limitation to
30 lower pixclocks (i got maximum about 70 MHz, i 30 lower pixclocks (i got maximum about 70 MHz, it is dependent on specific
31 hardware). This limitation is not enforced by 31 hardware). This limitation is not enforced by driver. Text mode supports 8bit
32 wide fonts only (hardware limitation) and 16bi 32 wide fonts only (hardware limitation) and 16bit tall fonts (driver
33 limitation). Unfortunately character attribute 33 limitation). Unfortunately character attributes (like color) in text mode are
34 broken for unknown reason, so its usefulness i 34 broken for unknown reason, so its usefulness is limited.
35 35
36 There are two 4 bpp modes. First mode (selecte 36 There are two 4 bpp modes. First mode (selected if nonstd == 0) is mode with
37 packed pixels, high nibble first. Second mode 37 packed pixels, high nibble first. Second mode (selected if nonstd == 1) is mode
38 with interleaved planes (1 byte interleave), M 38 with interleaved planes (1 byte interleave), MSB first. Both modes support
39 8bit wide fonts only (driver limitation). 39 8bit wide fonts only (driver limitation).
40 40
41 Suspend/resume works on systems that initializ 41 Suspend/resume works on systems that initialize video card during resume and
42 if device is active (for example used by fbcon 42 if device is active (for example used by fbcon).
43 43
44 44
45 Missing Features 45 Missing Features
46 ================ 46 ================
47 (alias TODO list) 47 (alias TODO list)
48 48
49 * secondary (not initialized by BIOS) 49 * secondary (not initialized by BIOS) device support
50 * big endian support 50 * big endian support
51 * DPMS support 51 * DPMS support
52 * MMIO support 52 * MMIO support
53 * interlaced mode variant 53 * interlaced mode variant
54 * support for fontwidths != 8 in 4 bpp 54 * support for fontwidths != 8 in 4 bpp modes
55 * support for fontheight != 16 in text 55 * support for fontheight != 16 in text mode
56 * hardware cursor 56 * hardware cursor
57 * vsync synchronization 57 * vsync synchronization
58 * feature connector support 58 * feature connector support
59 * acceleration support (8514-like 2D) 59 * acceleration support (8514-like 2D)
60 60
61 61
62 Known bugs 62 Known bugs
63 ========== 63 ==========
64 64
65 * character attributes (and cursor) in 65 * character attributes (and cursor) in text mode are broken
66 66
67 -- 67 --
68 Ondrej Zajicek <santiago@crfreenet.org> 68 Ondrej Zajicek <santiago@crfreenet.org>
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