linux-kernel - Re: Hardware Problem

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Message-ID: <4543E457.80203@tmr.com>
Date:	Sat, 28 Oct 2006 19:14:31 -0400
From:	Bill Davidsen <davidsen@....com>
To:	Marc Perkel <marc@...kel.com>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Hardware Problem - Asus A8N-VM CSM

Marc Perkel wrote:
> 
> 
> 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.
> 
Would have been interesting to use the "reset to factory defaults" 
option, just to see if some bit isn't set to known state doing that.

-- 
Bill Davidsen <davidsen@....com>
   Obscure bug of 2004: BASH BUFFER OVERFLOW - if bash is being run by a
normal user and is setuid root, with the "vi" line edit mode selected,
and the character set is "big5," an off-by-one errors occurs during
wildcard (glob) expansion.
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