Re: ide.2.4.1-p3.01112001.patch

[John Heil]

On Sat, 13 Jan 2001, Alan Cox wrote:

> Date: Sat, 13 Jan 2001 00:25:28 +0000 (GMT)
> From: Alan Cox <[e-mail]>
> To: Linus Torvalds <[e-mail]>
> Cc: Vojtech Pavlik <[e-mail]>, [e-mail]
> Subject: Re: ide.2.4.1-p3.01112001.patch
> 
> > what the bug is, and whether there is some other work-around, and whether
> > it is 100% certain that it is just those two controllers (maybe the other
> > ones are buggy too, but the 2.2.x tests basically cured their symptoms too
> > and peopl ehaven't reported them because they are "fixed").
> 
> I've not seen reports on the later chips. If they had been buggy and then 
> fixed I'd have expected much unhappy ranting before the change

The "fix" was an hdparm command like hdparm -X66 -m16c1d1 /dev/hda.
Which I set for my VIA 686a on a Tyan mobo w a 1G Athlon.

Interestingly, initially feeding that chip 40 wire cables (w/o the
-X66 of course) would result in the crc errors followed by DMA turn off,
about 85% of time... Other 15% was fine and DMA worked great.

I then switched to the 80 wire cable and DMA became rock solid at
which point the -X66 was added.

Just thought I'd add some data points :) 

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John Heil
South Coast Software
Custom systems software for UNIX and IBM MVS mainframes
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