From owner-freebsd-amd64@FreeBSD.ORG  Mon Aug 15 17:22:52 2005
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Date: Mon, 15 Aug 2005 10:22:50 -0700
From: Steve Kargl <sgk@troutmask.apl.washington.edu>
To: Martin Cracauer <cracauer@cons.org>
Message-ID: <20050815172250.GA32804@troutmask.apl.washington.edu>
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Cc: freebsd-amd64@freebsd.org
Subject: Re: 4 GB RAM showing up as 3, BIOS memory hole and all that
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On Mon, Aug 15, 2005 at 12:56:57PM -0400, Martin Cracauer wrote:
> 
> I have a Dual Opteron board with 4x 1 GB RAM.  The memory count in the
> BIOS goes up to 640 KB + 3072 MB, and FreeBSD says it sees 3 GB.

(snip)

> Any way to get my GB back?

This should be a FAQ.  No, you can't get it back.
David O'brien has explained this more than once in 
the freebsd-amd64 list.  Unfortunately, I don't
have a handy URL for you to read.  I suggest scanning
the list for posts by David in the Feb to May timeframe. 

-- 
Steve