linux-kernel - Re: Strange reboots on 2.6.29-rc6-wl

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Date:	Fri, 20 Mar 2009 11:21:07 +0100
From:	Nico -telmich- Schottelius 
	<nico-linux-ipw3945-devel@...ottelius.org>
To:	Sitsofe Wheeler <sitsofe@...oo.com>
Cc:	"John W. Linville" <linville@...driver.com>,
	Nico Schottelius <nico-linux-20090313@...ottelius.org>,
	LKML <linux-kernel@...r.kernel.org>,
	ipw3945-devel@...ts.sourceforge.net
Subject: Re: Strange reboots on 2.6.29-rc6-wl

Sitsofe Wheeler [Tue, Mar 17, 2009 at 02:57:53PM +0000]:
> On Tue, Mar 17, 2009 at 08:54:24AM +0100, Nico -telmich- Schottelius wrote:
> > 
> > Has anyone a clue on howto debug the build environment or
> > debugging the kernel before it's getting booted?
> 
> If you have a serial console you can probably get output on that.

There's no native serial port on the machine :-/

> If you have flipped EMBEDDED to Y then you might also have to enable
> EARLY_PRINTK. Another trick might be to turn set
> BOOT_PRINTK_DELAY (Kernel hacking -> Delay each boot printk message by N
> milliseconds) to something like 2000 and see if you can read/catch the
> messages before the kernel reboots...

I've EARLY_PRINTK set, but other than the edd probing message
I don't see anything.

> Failing that start a git bisection (
> http://www.kernel.org/doc/local/git-quick.html#bisect or
> http://www.stardust.webpages.pl/files/handbook/handbook-en-0.3-rc1.pdf )
> from the last good kernel...

I really don't think that it's the kernel's fault, because _all_
new versions I compile instantly reboot.

Last one I tried was v2.6.29-rc8-241-g65c2449 (linux-2.6).
Isn't there some flag to enable step by step execution (like in gdb)?

Or is somebody else using Debian squeeze with latest updates?

Sincerly,

Nico

-- 
Think about Free and Open Source Software (FOSS).
http://nico.schottelius.org/documentations/foss/the-term-foss/

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