From: Chris Samuel <chris@csamuel.org>
To: Ingo Molnar <mingo@elte.hu>
Subject: Re: 2.6.38.3 and 2.6.39-rc4 hangs after "Booting the kernel" on quad Pentium Pro system
Date: Sat, 23 Apr 2011 10:20:21 +1000
User-Agent: KMail/1.13.6 (Linux/2.6.38-8-generic; KDE/4.6.2; x86_64; ; )
Cc: "H. Peter Anvin" <hpa@zytor.com>, Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org, Yinghai Lu <yinghai@kernel.org>
References: <201104222333.25546.chris@csamuel.org> <20110422134648.GB23965@elte.hu>
In-Reply-To: <20110422134648.GB23965@elte.hu>
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Hi Ingo,

On Fri, 22 Apr 2011 11:46:48 PM Ingo Molnar wrote:

> Have you tried the earlyprintk=3Dvga boot parameter yet? Maybe that
> shows more  than just a silent hang ...

Thanks for that, just responded to Alan's email mentioning the
same option - I'd not come stumbled across it before.  It reveals
the cause is the kernel misdetecting the amount of LOWMEM as 16MB
and, I suspect, is the same issue as I had an offlist conversation
with H. Peter Anvin with in 2008 which tailed off due to work
pressure on his part.  There are more details in my response to Alan.

> Other than that, do you have some other box where you can build
> bzImages for  this system in reasonable time? If yes then you
> might be able to bisect to the commit that broke it.

I can indeed, I'm lucky enough to be able to build that image
in about 4 minutes on my production desktop.  Is that still of
use given that there's now a better view of what's going on ?

All the best,
Chris
=2D-=20
 Chris Samuel  :  http://www.csamuel.org/  :  Melbourne, VIC

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