| Ondrej Zajicek | a268422 | 2007-02-12 00:54:49 -0800 | [diff] [blame^] | 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> |