linux-kernel - Re: limiting to UDMA/33 instead of UDMA/100

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Date:	Sat, 8 Sep 2007 19:44:06 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	David Chinner <dgc@....com>, n <xellos@...ebottle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: limiting to UDMA/33 instead of UDMA/100 - pata_pdc202xx_old
 (also XFS error)?

On Fri, 07 Sep 2007 19:47:02 -0400
Jeff Garzik <jeff@...zik.org> wrote:

> >>         res 51/84:00:3f:00:00/00:00:00:00:00/e0 Emask 0x10 (ATA bus error)
> >>         res 51/84:00:3f:00:00/00:00:00:00:00/e0 Emask 0x10 (ATA bus error)
> >>         res 51/84:00:21:9d:fc/00:00:00:00:00/e6 Emask 0x10 (ATA bus error)
> 
> 
> ATA bus error == straight-from-hardware reported error
> 
> Cable or connector is dying maybe?  Bad power supplies also sometimes 
> manifest this way.

With PATA some kind of misclocking can occassionally produce similar
results so its worth a bit of driver debug as well - especially if
forcing the speed down a little helps.
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