linux-kernel - Re: [PATCH RFC] ahci: fix SB600 h/w errata issue

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Message-ID: <47CE96BF.50108@garzik.org>
Date:	Wed, 05 Mar 2008 07:49:03 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	linux-ide@...r.kernel.org, crane.cai@....com, Henry.Su@....com,
	shane.huang@....com
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC] ahci: fix SB600 h/w errata issue

Jeff Garzik wrote:
> I haven't seen anyone work on the recent SB600 errata, where the
> hardware does not like 256-length PRD entries.
> 
> Is this correct, AMD folks?
> 
> It hurts performance on SB600, but it is more important to get a
> correct patch eliminating the data corruption/lockups, and then later
> on tune for performance.
> 
> We simply limit each command to a maximum of 255 sectors, on SB600.
> 
> Signed-off-by: Jeff Garzik <jgarzik@...hat.com>
> ---
>  drivers/ata/ahci.c |   14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)

Based on Henry's response, I'm going to assume AMD approves of this patch...


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