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- 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>
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