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1===========================================2s3fb - fbdev driver for S3 Trio/Virge chips3===========================================4 5 6Supported Hardware7==================8 9 S3 Trio3210 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 supported16 - only BIOS initialized VGA devices supported17 - probably not working on big endian18 19I tested s3fb on Trio64 (plain, V+ and V2/DX) and Virge (plain, VX, DX),20all on i386.21 22 23Supported Features24==================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 directions35 * suspend/resume support36 * DPMS support37 38Text mode is supported even in higher resolutions, but there is limitation to39lower pixclocks (maximum usually between 50-60 MHz, depending on specific40hardware, i get best results from plain S3 Trio32 card - about 75 MHz). This41limitation is not enforced by driver. Text mode supports 8bit wide fonts only42(hardware limitation) and 16bit tall fonts (driver limitation). Text mode43support is broken on S3 Trio64 V2/DX.44 45There are two 4 bpp modes. First mode (selected if nonstd == 0) is mode with46packed pixels, high nibble first. Second mode (selected if nonstd == 1) is mode47with interleaved planes (1 byte interleave), MSB first. Both modes support488bit wide fonts only (driver limitation).49 50Suspend/resume works on systems that initialize video card during resume and51if device is active (for example used by fbcon).52 53 54Missing Features55================56(alias TODO list)57 58 * secondary (not initialized by BIOS) device support59 * big endian support60 * Zorro bus support61 * MMIO support62 * 24 bpp mode support on more cards63 * support for fontwidths != 8 in 4 bpp modes64 * support for fontheight != 16 in text mode65 * composite and external sync (is anyone able to test this?)66 * hardware cursor67 * video overlay support68 * vsync synchronization69 * feature connector support70 * acceleration support (8514-like 2D, Virge 3D, busmaster transfers)71 * better values for some magic registers (performance issues)72 73 74Known bugs75==========76 77 * cursor disable in text mode doesn't work78 * text mode broken on S3 Trio64 V2/DX79 80 81--82Ondrej Zajicek <santiago@crfreenet.org>83