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From: Steve Brueggeman <xioborg@yahoo.com>
To: linux-kernel@vger.kernel.org
Subject: Re: Athlon PSE/AGP Bug
Date: Tue, 22 Jan 2002 16:32:07 -0600
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Yep, that was the first thing that crossed my mind.  

I had a floppy with memtest86 installed on it, and it ran for 4 hours
without any errors.  Since I've seen memtest86 find bad bits on memory
modules
that normally worked for me, I figured that this must surely indicate 
that my segfaults are not related to bad memory subsystem.

Also, while I expect setting the command line option
mem=nopentium
would slow things down slightly, I don't think that they'd be so slow
as to hide the bad memory.  Also, the segfaults happen VERY reliably
without the mem=nopentium option, and have not happened even once, 
WITH the mem=nopentium option.

One more curious thing is, I've got 64MB GForce-2 MX, and the largest
I can set my AGP aparature size to is 64MB.  Maybe a boundary
condition thing???


On Tue, 22 Jan 2002 21:13:42 +0100, you wrote:

>Steve Brueggeman <brewgyman@mediaone.net> writes:
>
>> Forgot to mention, I got the segfaults compiling kernels while running
>> linux-2.4.17, I was in console, and did not have Frame Buffer, or drm drivers
>> loaded.  I did have the SiS AGP compiled into the kernel though.
>
>On my new system at home, I got similar segfaults.  Running memtest86
>revealed that one of the RAM modules had a problem--and if I swapped
>them, the BIOS startup code wouldn't even expand the actual BIOS code
>every other system boot.  After removing the offending RAM module (and
>later replacing it) the problems were completely gone and haven't
>returned yet...
>
>Fortunately, I didn't know of the PSE/AGP bug back then.  This made
>debugging much, much easier. ;-)


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