linux-kernel - Re: Regression: boot failure on AMD Elan TS-5500

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Date:	Mon, 16 Jun 2008 16:19:44 +0000
From:	Sean Young <sean@...s.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Cc:	linux-kernel@...r.kernel.org, "H. Anvin" <hpa@...or.com>
Subject: Re: Regression: boot failure on AMD Elan TS-5500

On Mon, Jun 16, 2008 at 06:37:12AM -0700, Jeremy Fitzhardinge wrote:
> Rusty Russell wrote:
> >On Monday 16 June 2008 22:11:39 Sean Young wrote:
> >  
> >>The symptons are either a crash or reboot on booting the kernel. No
> >>printk's have occurred yet -- even with early printk on.
> >>
> >>2.6.15 worked on this board however current does not. I've bisected it to:
> >>
> >>	commit a24e785111a32ccb7cebafd24b1b1cb474ea8e5d
> >>	Author: Rusty Russell <rusty@...tcorp.com.au>
> >>	Date:   Sun Oct 21 16:41:35 2007 -0700
> >>
> >>	    i386: paravirt boot sequence
> >>    
> >
> >Hi Sean,
> >
> >   Thanks for tracking this down.  Can we try reverting this in pieces to 
> >   see exactly what the cause was?
> >
> >1) Revert arch/x86/boot/compressed/head_32.S
> >2) If that doesn't fix it, Try removing the 8 lines which were added to 
> >arch/x86/kernel/head_32.S
> >  
> And the arch/x86/boot/compressed/misc_32.c change too, just in case...

Reverting only head_32.S makes the problem go away. I didn't try any other
changes.

> >I assume this is CONFIG_PARAVIRT=n?

Indeed.

> What bootloader does this platform use?  I wonder if it's setting things 
> up in an unexpected way?

It's syslinux. That must be the culprit, considering the change to head_32.S.

I'm digging in syslinux right now. 

Thanks
Sean
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