| |
| 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> |
