Axp-List Archive
SX164 onboard IDE

Subject: SX164 onboard IDE
From: Dan Morrill (morrildl@nycap.rr.com)
Date: Mon Jan 17 10:59:56 2000


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

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