Date: Wed, 17 Aug 2005 16:36:54 +0200 From: Martin Nilsson <martin@gneto.com> To: Scott Long <scottl@samsco.org> Cc: Martin Cracauer <cracauer@cons.org>, freebsd-amd64@freebsd.org Subject: Re: 4 GB RAM showing up as 3, BIOS memory hole and all that Message-ID: <43034B86.9080900@gneto.com> In-Reply-To: <43020F08.6070108@samsco.org> References: <20050815125657.A92343@cons.org> <20050815172250.GA32804@troutmask.apl.washington.edu> <20050815183846.A99145@cons.org> <430173BE.4080802@samsco.org> <20050816111428.A24284@cons.org> <43020F08.6070108@samsco.org>
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Scott Long wrote: > not do the remapping and result in you loosing effective RAM. The > difference between Intel and AMD is because AMD puts the memory > controller into the CPU instead of in the PCI host bridge, so it's much > harder to have the two work together to do the remapping. I believe > that there are some Opteron systems that can do this, though. The E stepping Opteron can remap memory. The earlier versions can't. The 252 and above is only avalable as rev. E, the slower models are being replaced in the near future. In order to use the remap feature your motherboard BIOS must know about it and have settings for memory remap. /Martin
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