Re: I'm having 4GB RAM, but Linux sees just 3GB???

[Christian Parpart <trapni@gentoo.org>]

(oops)

On Monday 16 May 2005 7:48 pm, Brian Gerst wrote:
> >  BIOS-e820: 0000000000000000 - 0000000000094800 (usable)
> >  BIOS-e820: 0000000000094800 - 00000000000a0000 (reserved)
> >  BIOS-e820: 00000000000c2000 - 0000000000100000 (reserved)
> >  BIOS-e820: 0000000000100000 - 00000000bff20000 (usable)
> >  BIOS-e820: 00000000bff20000 - 00000000bff2e000 (ACPI data)
> >  BIOS-e820: 00000000bff2e000 - 00000000bff80000 (ACPI NVS)
> >  BIOS-e820: 00000000bff80000 - 00000000c0000000 (reserved)
> >  BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
> >  BIOS-e820: 00000000fec00000 - 00000000fec00400 (reserved)
> >  BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
> >  BIOS-e820: 00000000fff80000 - 0000000100000000 (reserved)
> >
> > hmm... what does this mean?
>
> It means that there is a hole at 00000000c0000000 - 0000000100000000
> (3GB-4GB) for PCI memory-mapped devices.  The 4th GB of RAM should be
> remapped by the BIOS to 4GB-5GB, but isn't.  Your BIOS is either buggy
> or misconfigured.

Aiiii, that's good news.

I found a "Memhole" area. But I never used to change these items. 
Unfortunately, my TYAN board reference guide isn't telling me what to change 
there for good - so - can you tell me where to find more information about 
there?

If I remember correctly, it provided me the options ("Automatic"/"Manual") and 
a value list with the following items:
  64MB 128MB, 256MB, 512MB, 1024MB 2048MB, 3G, 3.5G.

and another list I can't remember by now.

but *playing* around with these values didn't help much (I just reduced my 
memory in linux down to 2GB once but didn't find the right values for getting 
4GB).

So, what should I do then?

Best reagrds,
Christian Parpart.

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