On Sat, Jul 21, 2001 at 08:51:03PM +0300, Jussi Teppo wrote:
> Hi!
> 
> I've recently upgraded my server hardware (Asus P5A) and installed NetBSD
> 1.5.1 on it. Everything else went just fine but I'm getting the following
> errors:
> 
> wd0: transfer error, downgrading to PIO mode 4
> wd0(pciide0:0:0): using PIO mode 4
> wd0e: aborted command, interface CRC error reading fsbn 646592 of
> 646592-646607
> (wd0 bn 2265330; cn 2247 tn 7 sn 23), retrying
> wd0: soft error (corrected)

I have such a board. It used to work at Ultra-DMA mode 2 with a Ultra/33
drive. Since I switched to a Ultra/66 drive I get a CRC error on first
access, the driver downgrades to UltraDMA mode 1 and then all is fine.
I did tests with various drives from different manufacturers; all Ultra/33
works fine; all Ultra/66 drives would not work at Ultra-DMA mode 2 but
work fine at Ultra-DMA mode 1. So I suspect a hardware bug on the controller
side here.
In your case, if it downgrades to Ultra-DMA mode 1 and then to PIO mode 4,
it's likely to be a problem on cable side. Maybe try a different cable ?

--
Manuel Bouyer <bouyer@antioche.eu.org>
--