SX164 onboard IDE

[Dan Morrill <morrildl nycap rr com>]

I know this has been discussed before;  the list archives show people having
success, so I'm sorry for the redundancy, but I'm hoping to get a definitive
answer in my case.

I have an SX164, which has an onboard EIDE controller.  Evidently this is a
CMD640 (?), though /proc/pci says it calls itself a Contaq 82C693.

My question is whether this chipset supports ATA-2 DMA transfers.  My current
understanding is that it supports ATA-2 DMA at 33MHz (not the newer 66MHz), and
that this functionality is supported by the IDE kernel driver on the Alpha.
Is this correct?  Also, do I have to jump through any hoops to get this
working (e.g. hdparm) or will the driver configure itself?


My system actually boots from a SCSI disk, but I can get a 6GB ATA-2 33MHz
disk real cheap, so I'd like to throw it in, as long as it won't hose my
performance.  Thanks in advance for any info!


Dan Morrill
Computer Scientist, Physicist