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s3fb - fbdev driver for S3 Trio/Virge chips
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===========================================
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Supported Hardware
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==================
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S3 Trio32
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S3 Trio64 (and variants V+, UV+, V2/DX, V2/GX)
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S3 Virge (and variants VX, DX, GX and GX2+)
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S3 Plato/PX (completely untested)
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S3 Aurora64V+ (completely untested)
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- only PCI bus supported
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- only BIOS initialized VGA devices supported
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- probably not working on big endian
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I tested s3fb on Trio64 (plain, V+ and V2/DX) and Virge (plain, VX, DX),
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all on i386.
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Supported Features
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==================
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* 4 bpp pseudocolor modes (with 18bit palette, two variants)
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* 8 bpp pseudocolor mode (with 18bit palette)
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* 16 bpp truecolor modes (RGB 555 and RGB 565)
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* 24 bpp truecolor mode (RGB 888) on (only on Virge VX)
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* 32 bpp truecolor mode (RGB 888) on (not on Virge VX)
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* text mode (activated by bpp = 0)
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* interlaced mode variant (not available in text mode)
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* doublescan mode variant (not available in text mode)
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* panning in both directions
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* suspend/resume support
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* DPMS support
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Text mode is supported even in higher resolutions, but there is limitation to
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lower pixclocks (maximum usually between 50-60 MHz, depending on specific
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hardware, i get best results from plain S3 Trio32 card - about 75 MHz). This
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limitation is not enforced by driver. Text mode supports 8bit wide fonts only
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(hardware limitation) and 16bit tall fonts (driver limitation). Text mode
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support is broken on S3 Trio64 V2/DX.
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There are two 4 bpp modes. First mode (selected if nonstd == 0) is mode with
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packed pixels, high nibble first. Second mode (selected if nonstd == 1) is mode
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with interleaved planes (1 byte interleave), MSB first. Both modes support
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8bit wide fonts only (driver limitation).
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Suspend/resume works on systems that initialize video card during resume and
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if device is active (for example used by fbcon).
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Missing Features
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================
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(alias TODO list)
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* secondary (not initialized by BIOS) device support
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* big endian support
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* Zorro bus support
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* MMIO support
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* 24 bpp mode support on more cards
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* support for fontwidths != 8 in 4 bpp modes
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* support for fontheight != 16 in text mode
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* composite and external sync (is anyone able to test this?)
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* hardware cursor
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* video overlay support
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* vsync synchronization
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* feature connector support
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* acceleration support (8514-like 2D, Virge 3D, busmaster transfers)
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* better values for some magic registers (performance issues)
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Known bugs
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==========
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* cursor disable in text mode doesn't work
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* text mode broken on S3 Trio64 V2/DX
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--
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Ondrej Zajicek <santiago@crfreenet.org>
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