1=========================================== 2s3fb - fbdev driver for S3 Trio/Virge chips 3=========================================== 4 5 6Supported 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 19I tested s3fb on Trio64 (plain, V+ and V2/DX) and Virge (plain, VX, DX), 20all on i386. 21 22 23Supported 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 38Text mode is supported even in higher resolutions, but there is limitation to 39lower pixclocks (maximum usually between 50-60 MHz, depending on specific 40hardware, i get best results from plain S3 Trio32 card - about 75 MHz). This 41limitation is not enforced by driver. Text mode supports 8bit wide fonts only 42(hardware limitation) and 16bit tall fonts (driver limitation). Text mode 43support is broken on S3 Trio64 V2/DX. 44 45There are two 4 bpp modes. First mode (selected if nonstd == 0) is mode with 46packed pixels, high nibble first. Second mode (selected if nonstd == 1) is mode 47with interleaved planes (1 byte interleave), MSB first. Both modes support 488bit wide fonts only (driver limitation). 49 50Suspend/resume works on systems that initialize video card during resume and 51if device is active (for example used by fbcon). 52 53 54Missing Features 55================ 56(alias TODO list) 57 58 * secondary (not initialized by BIOS) device support 59 * big endian support 60 * Zorro bus support 61 * MMIO support 62 * 24 bpp mode support on more cards 63 * support for fontwidths != 8 in 4 bpp modes 64 * support for fontheight != 16 in text mode 65 * composite and external sync (is anyone able to test this?) 66 * hardware cursor 67 * video overlay support 68 * vsync synchronization 69 * feature connector support 70 * acceleration support (8514-like 2D, Virge 3D, busmaster transfers) 71 * better values for some magic registers (performance issues) 72 73 74Known bugs 75========== 76 77 * cursor disable in text mode doesn't work 78 * text mode broken on S3 Trio64 V2/DX 79 80 81-- 82Ondrej Zajicek <santiago@crfreenet.org> 83