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SubjectRe: Does kernel require IDE enabled in BIOS to access HD, FS errors?
Andre,

I had a chance to play a little more today, here is what I've come up with:

a. w/ hdc disable in BIOS, changing the PIO mode to 0 or 1 seems to allow the
system to run error free. PIO mode 3 still has silent FS corruption issues.

b. w/ hdc enabled in BIOS, the PIO mode doesn't seem to matter. (except for speed;)

c. CONFIG_IDEDMA_PCI_AUTO affects the number of interrupts needed to complete
each block xfer. With it enabled the number of IRQ's per second ~600.
With it disabled ~2/block or 5000-6000 per second. I thought from the dmesg
output that DMA was disabled and this option should have no affect.

> CMD646: IDE controller on PCI bus 00 dev 10
> CMD646: chipset revision 1
> CMD646: not 100% native mode: will probe irqs later
> CMD646: chipset revision 0x01, MultiWord DMA Limited, IRQ workaround enabled
> CMD646: simplex device: DMA disabled
> ide0: CMD646 Bus-Master DMA disabled (BIOS)
> CMD646: simplex device: DMA disabled
> ide1: CMD646 Bus-Master DMA disabled (BIOS)

d. CONFIG_IDEDMA_PCI_AUTO does not seem to affect the outcome of "a" or "b" above.

Martin

andre@linux-ide.org wrote:
>
> Martin, you have an old beast that there are problems in how the chipset
> was deployed.
> How are you confirming the corruption against the various layers in the
> kernel?
> If you would like patches & tests to verify I will send them to you.
>
> Cheers
>
> --
> Andre Hedrick
> Linux ATA Development
> ASL Kernel Development
> -----------------------------------------------------------------------------
> ASL, Inc. Toll free: 1-877-ASL-3535
> 1757 Houret Court Fax: 1-408-941-2071
> Milpitas, CA 95035 Web: www.aslab.com
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