Re: cerberus errors on 2.4.19 (ide dma related)

From: Ed Sweetman (
Date: Sun Aug 18 2002 - 13:04:42 EST

the dmesg i included shows my chipsets
 VIA vt82c686b (rev 40) IDE UDMA100 controller on pci00:07.1
PDC20262: (U)DMA Burst Bit ENABLED Primary PCI Mode Secondary PCI Mode.

On Sun, 2002-08-18 at 13:50, Jonathan Lundell wrote:
> At 3:26 AM -0400 8/18/02, Ed Sweetman wrote:
> >It appears then that there are some DMA issues with the promise
> >controller i have with the driver. My swap used to be on the drive
> >on the promise controller before which would explain fs corruption
> >on both drives (swap cached and such).
> FWIW, this is a semi-well-known phenomenon with the IDE controller in
> the ServerWorks OSB4 south bridge. As I recall from our testing, a
> word appears to be dropped in the DMA transfer to the disk. We found
> that both PIO and multi-word DMA worked OK.
> What's your chipset?
> --
> /Jonathan Lundell.

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