Subject: Re: kern/11293: UDMA is unstable on Iwill VD133PL (Apollo MVP3, IDE rev 0x10)
To: Manuel Bouyer <>
From: Todd P. Whitesel <>
List: netbsd-bugs
Date: 10/25/2000 01:39:53
> Please try another thing: leave UDMA enabled in the kernel, and
> force Ultra mode 2 (or Ultra/33) in the BIOS instead of Ultra mode 4
> (or Ultra/66).

The BIOS doesn't let me set that, it only has "Auto" vs. "Disable" for
both PIO and UDMA, for each of four IDE devices.

But with a UDMA33 drive, I get the same spurious error behavior.

--- NOTE ---

After two days of success, the PIO-only mode tests have now exhibited the
same spurious errors, with both FreeBSD 4.1.1 and NetBSD 1.5_ALPHA2.

So that would suggest that this isn't a strictly UDMA issue after all,
but rather a very subtle VIA PC133 issue... yuck.

Todd Whitesel					Anime Expo Information at
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