Re: Problems with AMD64 and 8 GB RAM?

From: David O'Brien (obrien_at_FreeBSD.org)
Date: 03/31/05

  • Next message: David O'Brien: "Re: Problems with AMD64 and 8 GB RAM?" 
    Date: Thu, 31 Mar 2005 10:47:33 -0800
To: "Greg 'groggy' Lehey" <grog@FreeBSD.org>

    On Thu, Mar 31, 2005 at 08:14:45AM +0930, Greg 'groggy' Lehey wrote:
    > > I had 4 bad out of 12 tested where the DIMMs were Crucial PC2700 2GB
    > > Reg. ECC DIMMs.
    >
    > OK, this makes sense. It might also explain why the 4 GB
    > configuration only recognizes 3.5 GB.

    No. This is due to the 3.5-4.0GB PA address range that the PeeCee
    architecture reserves for the PCI config space, AGP GART, memory mapped
    I/O, etc... Many Opteron BIOS's don't bother to hoist the "covered"
    memory above 4GB.

    Please see the freebsd-amd64 archives -- this has been discussed many
    times. 

    -- 
-- David  (obrien@FreeBSD.org)
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