> I can't find the chip's datasheet. CMD only gives it to direct customers.
> I do have the datasheet for the CMD-646U, a prior UDMA supporting chip.

Have you tried mailing them?.  I sent mail to something silly like
support@cmd.  After they found the right person for me to talk to, I
mentioned wanting to play with linux support, and he happily sent the
datasheets for the 648 and 649.

I use andre's 2.2 ide patches to get support for it..

-- 
 zach
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