Date: Sun, 21 Aug 2005 18:55:36 +0200 From: Daniel Rock <freebsd@deadcafe.de> To: Martin Nilsson <martin@gneto.com> 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: <4308B208.8090003@deadcafe.de> In-Reply-To: <43034B86.9080900@gneto.com> 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> <43034B86.9080900@gneto.com>
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Martin Nilsson schrieb: > The E stepping Opteron can remap memory. The earlier versions can't. Also the earlier versions can remap memory, although different. If I understand the documentation correctly: http://www.amd.com/us-en/Processors/TechnicalResources/0,,30_182_739_9003,00.html (Document #26094: BIOS and Kernel Developer's Guide, Section 3.5.8) on earlier models the memory can only be remapped between processor nodes, so if the first CPU has 4 GB (or more) memory attached, the memory hidden by the I/O space is lost. Daniel
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