Commit | Line | Data |
---|---|---|
a268422d OZ |
1 | |
2 | s3fb - fbdev driver for S3 Trio/Virge chips | |
3 | =========================================== | |
4 | ||
5 | ||
6 | Supported Hardware | |
7 | ================== | |
8 | ||
9 | S3 Trio32 | |
10 | S3 Trio64 (and variants V+, UV+, V2/DX, V2/GX) | |
11 | S3 Virge (and variants VX, DX, GX and GX2+) | |
12 | S3 Plato/PX (completely untested) | |
13 | S3 Aurora64V+ (completely untested) | |
14 | ||
15 | - only PCI bus supported | |
16 | - only BIOS initialized VGA devices supported | |
17 | - probably not working on big endian | |
18 | ||
19 | I tested s3fb on Trio64 (plain, V+ and V2/DX) and Virge (plain, VX, DX), | |
20 | all on i386. | |
21 | ||
22 | ||
23 | Supported Features | |
24 | ================== | |
25 | ||
26 | * 4 bpp pseudocolor modes (with 18bit palette, two variants) | |
27 | * 8 bpp pseudocolor mode (with 18bit palette) | |
28 | * 16 bpp truecolor modes (RGB 555 and RGB 565) | |
29 | * 24 bpp truecolor mode (RGB 888) on (only on Virge VX) | |
30 | * 32 bpp truecolor mode (RGB 888) on (not on Virge VX) | |
31 | * text mode (activated by bpp = 0) | |
32 | * interlaced mode variant (not available in text mode) | |
33 | * doublescan mode variant (not available in text mode) | |
34 | * panning in both directions | |
35 | * suspend/resume support | |
36 | * DPMS support | |
37 | ||
38 | Text mode is supported even in higher resolutions, but there is limitation | |
39 | to lower pixclocks (maximum between 50-60 MHz, depending on specific hardware). | |
40 | This limitation is not enforced by driver. Text mode supports 8bit wide fonts | |
41 | only (hardware limitation) and 16bit tall fonts (driver limitation). | |
42 | ||
43 | There are two 4 bpp modes. First mode (selected if nonstd == 0) is mode with | |
44 | packed pixels, high nibble first. Second mode (selected if nonstd == 1) is mode | |
45 | with interleaved planes (1 byte interleave), MSB first. Both modes support | |
46 | 8bit wide fonts only (driver limitation). | |
47 | ||
48 | Suspend/resume works on systems that initialize video card during resume and | |
49 | if device is active (for example used by fbcon). | |
50 | ||
51 | ||
52 | Missing Features | |
53 | ================ | |
54 | (alias TODO list) | |
55 | ||
56 | * secondary (not initialized by BIOS) device support | |
57 | * big endian support | |
58 | * Zorro bus support | |
59 | * MMIO support | |
60 | * 24 bpp mode support on more cards | |
61 | * support for fontwidths != 8 in 4 bpp modes | |
62 | * support for fontheight != 16 in text mode | |
63 | * composite and external sync (is anyone able to test this?) | |
64 | * hardware cursor | |
65 | * video overlay support | |
66 | * vsync synchronization | |
67 | * feature connector support | |
68 | * acceleration support (8514-like 2D, Virge 3D, busmaster transfers) | |
69 | * better values for some magic registers (performance issues) | |
70 | ||
71 | ||
72 | Known bugs | |
73 | ========== | |
74 | ||
75 | * cursor disable in text mode doesn't work | |
76 | ||
77 | -- | |
78 | Ondrej Zajicek <santiago@crfreenet.org> |