linux-kernel - Re: Regression in 2.6.23-pre Was: Problems with 2.6.23-rc6 on AMD Geode LX800

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Date:	Wed, 26 Sep 2007 12:14:47 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jordan Crouse <jordan.crouse@....com>
CC:	Joerg Pommnitz <pommnitz@...oo.com>, cebbert@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: Regression in 2.6.23-pre Was: Problems with 2.6.23-rc6 on AMD
 Geode LX800

Jordan Crouse wrote:
> 
> Its the latter - max_pfn as read by find_max_pfn() in arch/i386/e820.c
> is being set to 9F (640k) in the broken case, this due to the
> the e820 map looking something like this:
> 
> Address   Size      Type
> 00000000  0009FC00  1
> 0009FC00  00000400  2
> 000E0000  00002000  2
> 
> (Yep, thats it - thats the list.  e820.nr_map is indeed 3). 
> 
> Long story short, bdata->node_low_pfn gets set to 9F, and When we 
> try to allocate the bootmem bitmap (at _pa_symbol(_text), which is 
> page 0x100), then the system gets appropriately angry.
> 
> As background, I'm using syslinux 3.36 as my loader here - I've used this
> exact same version for a very long time, so I don't blame it in the least.
> Something is getting confused in the early kernel, and whatever that
> something is, a still unknown change in a newer version of the BIOS
> fixed it.  The search goes on.
> 

Please try the following debug patch to let us know what is going on.

	-hpa

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