Messages in this thread | | | From | Andrew Walrond <> | Subject | Re: lost memory on a 4GB amd64 | Date | Thu, 16 Sep 2004 14:48:38 +0100 |
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On Thursday 16 Sep 2004 05:48, Sergei Haller wrote: > Hello, > > A friend of mine has a new Opteron based machine (Tyan Tiger K8W with two > Opteron 24?) and 4GB main memory.
Typo? Tyan Thunder?
> > the problem is that about 512 MB of that memory is lost (AGP aperture and > stuff). Although everything is perfect otherwise. > As far as I understand, all the PCI/AGP hardware uses the top end of the > 4GB address range to access their memory and there is just an > "overlapping" of the addresses. thus only the remaining 3.5 GB are > available. > > > Now there is an option in the BIOS called "Adjust Memory" which puts a > certain amount of memory (several choices between 64MB and 2GB) above the > 4GB address range. I tried the 2GB setting which results in 2GB main > memory at addresses 0-2GB and 2GB memory at addresses 4GB-6GB. >
Ok;
Assuming bios version 2.02. (upgrade if you haven't already);
The option you mention should be set to 'Auto'
Chipset->Northbridge->Memory Configuration->Adjust Memory = Auto
but set
Advanced->Cpu Configuration->MTRR Mapping = Continuous
That fixed it for me if I remember correctly :)
Andrew Walrond - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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