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Message-id: <alpine.LNX.2.00.0912220955341.1696@darkstar.example.net>
Date:	Tue, 22 Dec 2009 10:02:07 +0800 (CST)
From:	fengxiangjun <fengxiangjun@...soft.com>
To:	Robert Hancock <hancockrwd@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	Tejun Heo <tj@...nel.org>
Subject: Re: 2.6.32.2 SATA link detect failed, 2.6.32.1 works fine


You are right, it's definitely timing related.

I just tried capturing the failed booting message through a null modem 
cable, but the problem goes away! It seems that I can't reproduce it 
with serial console attached.

dmesg attached. 

On Mon, 21 Dec 2009, Robert Hancock wrote:

> On Mon, Dec 21, 2009 at 7:02 PM, fengxiangjun <fengxiangjun@...soft.com> wrote:
> >
> > Yeah, running 2.6.32.1 now, no problem.
> >
> > dmesg shows:
> >
> > ata1.00: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
> >
> > When booting 2.6.32.2 with the same config, I get
> >
> > ata1.00: SATA link down (SStatus 0 SControl 301)
> >
> > Weird.
> 
> CCing linux-ide and Tejun. Could be some kind of timing difference
> triggering the problem, perhaps?
> 
> >
> > On Mon, 21 Dec 2009, Robert Hancock wrote:
> >
> >> On 12/21/2009 05:12 AM, fengxiangjun wrote:
> >> >
> >> > Hi,
> >> >
> >> > after upgrading to 2.6.32.2,
> >> > with the attached config,
> >> > kernel booting always(just tried 10+ times) failed at:
> >> >
> >> > ata1.00: SATA link down (SStatus 0 SControl 301)
> >> > ...
> >> > VFS: Cannot open root device ...
> >>
> >> There were no libata changes in 2.6.32.2 that should have affected this. Are
> >> you sure the .config is unchanged? Have you rechecked that 2.6.31.1 still
> >> works?
> >>
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