ICH9 based IDE speed negotiation error

[Sean Bruno]

I have an IBM x3250M with a CF IDE flash device in the IDE controller 
socket instead of the CDROM. 

It appears that the ICH9 IDE chipset is negotiating to UDMA66 instead of 
UDMA33 on this board, and that is not the speed of my CF IDE device:
http://www.transcendusa.com/Products/ModDetail.asp?ModNo=26&LangNo=0

The same device in three other motherboards (ICH7 and SiS181) don't seem 
to have the negotiation issue.  This negotiation failure causes CRC 
errors writing to the disk:

ad6: WARNING - WRITE_DMA UDMA ICRC error (retrying request) 
LBA=357735         
ad6: WARNING - WRITE_DMA UDMA ICRC error (retrying request) LBA=359015     

Setting the mode down to UDMA33 fixes the issue.(atacontrol mode ad6 
UDMA33).

Sean