| =========================================== | |
| s3fb - fbdev driver for S3 Trio/Virge chips | |
| =========================================== | |
| Supported Hardware | |
| ================== | |
| S3 Trio32 | |
| S3 Trio64 (and variants V+, UV+, V2/DX, V2/GX) | |
| S3 Virge (and variants VX, DX, GX and GX2+) | |
| S3 Plato/PX (completely untested) | |
| S3 Aurora64V+ (completely untested) | |
| - only PCI bus supported | |
| - only BIOS initialized VGA devices supported | |
| - probably not working on big endian | |
| I tested s3fb on Trio64 (plain, V+ and V2/DX) and Virge (plain, VX, DX), | |
| all on i386. | |
| 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) on (only on Virge VX) | |
| * 32 bpp truecolor mode (RGB 888) on (not on Virge VX) | |
| * text mode (activated by bpp = 0) | |
| * interlaced mode variant (not available in text mode) | |
| * doublescan mode variant (not available in text mode) | |
| * panning in both directions | |
| * suspend/resume support | |
| * DPMS support | |
| Text mode is supported even in higher resolutions, but there is limitation to | |
| lower pixclocks (maximum usually between 50-60 MHz, depending on specific | |
| hardware, i get best results from plain S3 Trio32 card - about 75 MHz). This | |
| limitation is not enforced by driver. Text mode supports 8bit wide fonts only | |
| (hardware limitation) and 16bit tall fonts (driver limitation). Text mode | |
| support is broken on S3 Trio64 V2/DX. | |
| 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 | |
| * Zorro bus support | |
| * MMIO support | |
| * 24 bpp mode support on more cards | |
| * support for fontwidths != 8 in 4 bpp modes | |
| * support for fontheight != 16 in text mode | |
| * composite and external sync (is anyone able to test this?) | |
| * hardware cursor | |
| * video overlay support | |
| * vsync synchronization | |
| * feature connector support | |
| * acceleration support (8514-like 2D, Virge 3D, busmaster transfers) | |
| * better values for some magic registers (performance issues) | |
| Known bugs | |
| ========== | |
| * cursor disable in text mode doesn't work | |
| * text mode broken on S3 Trio64 V2/DX | |
| -- | |
| Ondrej Zajicek <santiago@crfreenet.org> |