win xp cyrix cx5530 dma issues

Jan 16, 2006 1 Replies
L

I'm using WinXP (not XPe) with a Cyrix cx5530 / NS Geode SBC. I took out most of the unecessary programs and stopped a lot of services with XP Lite, so XP is running fairly smooth.



Unfortunately, even though I've selected "DMA if possible", the primary IDE channel always reverts to PIO mode. I've tried uninstalling and reinstalling the channel. I've also tried deleting the MasterIdDataChecksum and SlaveIdDataChecksum registry keys. I've also tried changing the cable and removing unecessary hardware, but it's still in PIO mode. Has anyone fixed this before? Is there another cx5530 UDMA driver I can use?



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S

I ran into the same thing with my desktop PC (using a SATA drive) - seems to be a known pathology with XP. After many months of faultless operation, my C drive reverted to PIO mode - and wouldn't budge no matter what I tried. I uninstalled/reinstalled drivers, did various registry cleanups [1], got nowhere. Finally moved the drive to another SATA channel, and it's been fine ever since.

If it happens again, I'm in trouble. Can't see any solution short of re-installing XP - or (better still) sticking with Unix and finding non-MS versions of all my compilers/CAD packages etc. If you find a solution, I'd love to hear it.

[1] Some references:
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Steve

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