From owner-freebsd-amd64@FreeBSD.ORG Mon Aug 15 16:56:59 2005 Return-Path: X-Original-To: freebsd-amd64@freebsd.org Delivered-To: freebsd-amd64@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 6EE4716A41F for ; Mon, 15 Aug 2005 16:56:59 +0000 (GMT) (envelope-from cracauer@schlepper.zs64.net) Received: from schlepper.zs64.net (schlepper.zs64.net [212.12.50.230]) by mx1.FreeBSD.org (Postfix) with ESMTP id DAFA043D48 for ; Mon, 15 Aug 2005 16:56:58 +0000 (GMT) (envelope-from cracauer@schlepper.zs64.net) Received: from schlepper.zs64.net (schlepper [212.12.50.230]) by schlepper.zs64.net (8.13.1/8.12.9) with ESMTP id j7FGuvwG092586 for ; Mon, 15 Aug 2005 18:56:57 +0200 (CEST) (envelope-from cracauer@schlepper.zs64.net) Received: (from cracauer@localhost) by schlepper.zs64.net (8.13.1/8.12.9/Submit) id j7FGuvZ5092585 for freebsd-amd64@freebsd.org; Mon, 15 Aug 2005 12:56:57 -0400 (EDT) (envelope-from cracauer) Date: Mon, 15 Aug 2005 12:56:57 -0400 From: Martin Cracauer To: freebsd-amd64@freebsd.org Message-ID: <20050815125657.A92343@cons.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i Subject: 4 GB RAM showing up as 3, BIOS memory hole and all that X-BeenThere: freebsd-amd64@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Porting FreeBSD to the AMD64 platform List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 15 Aug 2005 16:56:59 -0000 Somebody here must know this: 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. I know/assume/heared this has to do with the I/O space placed in the upper GB and that you can re-map the top GB to avoid the problem. The BIOS has the options to have a memory hole which I set to 1 GB, thinking it would put the 3G-4G memory at 4G-5G instead. It seems I am wrong about this, I am stuck with 3 GB. Obviously I don't understand how that top GB for I/O works, how can that work when the machine has less than 3 GB? Any way to get my GB back? I know the hardware is OK by cross-checking all modules individually. And I can see that the memory bandwidth is that of dual-channel, so it is not a case of one stick not being recognized. Specs: - Armima Rioworks HDAMB, 2x Opteron 246, 4x 1 GB PC2100 - FreeBSD-7.0-current/AMD64, SMP kernel - dmesg, pciconf etc on http://www.cons.org/cracauer/machines/wings/ Thanks! Martin -- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Martin Cracauer http://www.cons.org/cracauer/ No warranty. This email is probably produced by one of my cats stepping on the keys. No, I don't have an infinite number of cats.