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Date: Mon, 12 Aug 2002 10:51:32 +0200
From: Lars Ellenberg <lglnberg@rz.uni-potsdam.de>
To: linux-kernel@vger.kernel.org
Subject: Re: via vp3 udma corruption
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On Sun, Aug 11, 2002 at 04:08:26PM -0500, David Fries wrote:
> I started on 2.4.19 testing a CD-ROM with the ide-scsi driver.  It
> gave errors with UDMA enabled.  Many hours later I decided my
> harddrive is silently flipping a bit every once and a while on read!

yes, known issue -- to me, at least. had this on a similar VIA board
last year. happens all the time you have high DMA load. bios update
fixed it for me (or at least reduced the frequency so I did not notice
it any longer). I do not know whether it will fix it for you, maybe they
have screwed up differently this time :)

> Why wouldn't the harddrive report CRC errors?

hm, because it reads ok, and the bitflip is done by the broken DMA
lateron?

> I don't see any errors with UDMA disabled on both the hard drive and
> CDROM.
> 
>     Host bridge: VIA Technologies, Inc. VT82C597 [Apollo VP3] (rev 4).
>     PCI bridge: VIA Technologies, Inc. VT82C598/694x [Apollo MVP3/Pro133x AGP] (rev 0).
>     ISA bridge: VIA Technologies, Inc. VT82C586/A/B PCI-to-ISA [Apollo VP] (rev 65).
>     IDE interface: VIA Technologies, Inc. Bus Master IDE (rev 6).
Cheers,
 Lars-Gunnar
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