TODO revision 692f60a7 
11. Acceleration:
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3   a. Limitations from 3.3 apply.
4   b. No CPU to Screen color expand. Chipset requires SCANLINE_PAD_BYTE
5      XAA only supports SCANLINE_PAD_WORD
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72. Driver itself:
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9   a. VL bus probe might be too intrusive
10   b. min clock guessed 11.0 MHz
11   c. guessed: interlace allowed only when external display is enabled.
12   d. display pitch guessed to be 8 bit.
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143. I2C Support:
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16   a. Readback of clockline not implemented. 
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20$XFree86$
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