Re: IDE corruption, 2.2, VIA chipset in PIO mode

[Neil Conway]

Alan Cox wrote:
> 
> > Used for a while, copied about 7gigs onto it.  Then got lots of BadCRC
> > errors when reading from disk (from dma_intr).  Decided to disable DMA
> > as a result of this...
> 
> Cable errors. Disabling DMA also disabled error checking and correction

Jeez.  Crappity, crappity, crap.  Embarrassing mistake of the year.

I managed to convince myself that the cable couldn't possibly be
responsible, because we got corruption even when using UDMA-33 (which
protects from cable faults).  Somewhere in my logic I obviously lost the
plot, and forgot that I switched DMA off *before* seeing corruption.

Sigh.  Ah, I think I see a nice brown bag, in a nice deep hole.

Thank you for gently pointing out the error of my ways ;-)

Neil