linux-kernel - Re: 2.6.38.3 and 2.6.39-rc4 hangs after "Booting the kernel" on quad Pentium Pro system

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Date:	Sat, 23 Apr 2011 10:20:21 +1000
From:	Chris Samuel <chris@...muel.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: Re: 2.6.38.3 and 2.6.39-rc4 hangs after "Booting the kernel" on quad Pentium Pro system

Hi Ingo,

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

> Have you tried the earlyprintk=vga 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
-- 
 Chris Samuel  :  http://www.csamuel.org/  :  Melbourne, VIC

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