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64 lines
1.9 KiB
64 lines
1.9 KiB
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vt8623fb - fbdev driver for graphics core in VIA VT8623 chipset |
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Supported Hardware |
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VIA VT8623 [CLE266] chipset and its graphics core |
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(known as CastleRock or Unichrome) |
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I tested vt8623fb on VIA EPIA ML-6000 |
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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 mode (RGB 565) |
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* 32 bpp truecolor mode (RGB 888) |
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* text mode (activated by bpp = 0) |
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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 about 100 MHz). This limitation is not enforced by |
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driver. Text mode supports 8bit wide fonts only (hardware limitation) and |
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16bit tall fonts (driver limitation). |
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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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* MMIO support |
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* interlaced mode variant |
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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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* hardware cursor |
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* video overlay support |
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* vsync synchronization |
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* acceleration support (8514-like 2D, busmaster transfers) |
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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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-- |
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Ondrej Zajicek <[email protected]>
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