linux-kernel - Re: Hardware Problem

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Date:	Fri, 27 Oct 2006 09:41:36 -0700
From:	Marc Perkel <marc@...kel.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: Hardware Problem - Asus A8N-VM CSM



Langsdorf, Mark wrote:
>>> The problem. 2 out of the 4 sees all 4 gigs of ram. The other 2 see 
>>> only 2.8 gigs of ram. And it's hardware related because in the bios 
>>> setup the ones that show 2.8 show it in the bios.
>>>
>>> The motherboards were not prchased at the same time. All have 
>>> different brands of ram. And the processors are different. 
>>> The 2 that don't see all the ram are the newest ones.
>>>
>>> I tried swapping ram between one that saw 2.8 gigs and one 
>>> that saw 4 gigs and the problem stays with the motherboard.
>>> I haven't yet swapped out the processors.
>>>
>>> So - I'm a little stumped. Can someone point me in the 
>>> right direction?
>>>       
>
> Usually, missing memory comes from the PCI I/O hole, or the
> IOMMU/AGP/framebuffer overlays.  Does your BIOS have an
> options for creating a memory hole or hoisting memory?  If
> so, are the settings between the 4G machines different from
> the 2.8G machines?
>
> Also, do you have an IOMMU aperture enabled and if so, how
> large?
>
> Are there any hardware differences between the systems, like
> different AGP or PCI graphics cards?
>
>   
>> Answering my own question perhaps. Could it be related to 
>> whether or not the processor is a "revision e" chip?
>>     
>
> Possibly, but I'd expect the RevE parts to see more DRAM than
> the earlier parts.
>
>
>   

I fixed the problem. It wasn't a Revision E issue after all. I just 
pulled the battery and when it came up clean it saw all the memory. 
Thanks for your help.

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