From owner-freebsd-hackers@FreeBSD.ORG Mon Feb 13 17:07:57 2006 Return-Path: X-Original-To: freebsd-hackers@freebsd.org Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 1BFCA16A424 for ; Mon, 13 Feb 2006 17:07:57 +0000 (GMT) (envelope-from jhb@freebsd.org) Received: from speedfactory.net (mail6.speedfactory.net [66.23.216.219]) by mx1.FreeBSD.org (Postfix) with ESMTP id C807243D5A for ; Mon, 13 Feb 2006 17:07:55 +0000 (GMT) (envelope-from jhb@freebsd.org) Received: from server.baldwin.cx (unverified [66.23.211.162]) by speedfactory.net (SurgeMail 3.5b3) with ESMTP id 8360284 for multiple; Mon, 13 Feb 2006 12:07:15 -0500 Received: from localhost (john@localhost [127.0.0.1]) by server.baldwin.cx (8.13.4/8.13.4) with ESMTP id k1DH7oZM050573; Mon, 13 Feb 2006 12:07:53 -0500 (EST) (envelope-from jhb@freebsd.org) From: John Baldwin To: freebsd-hackers@freebsd.org, babkin@users.sourceforge.net Date: Mon, 13 Feb 2006 12:07:05 -0500 User-Agent: KMail/1.9.1 References: <20060208164141.GA21718@trispen.com> <43EEC980.32C2FA40@verizon.net> In-Reply-To: <43EEC980.32C2FA40@verizon.net> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200602131207.07212.jhb@freebsd.org> X-Virus-Scanned: ClamAV 0.87.1/1286/Mon Feb 13 06:41:56 2006 on server.baldwin.cx X-Virus-Status: Clean X-Spam-Status: No, score=-1.4 required=4.2 tests=ALL_TRUSTED,AWL autolearn=ham version=3.1.0 X-Spam-Checker-Version: SpamAssassin 3.1.0 (2005-09-13) on server.baldwin.cx X-Server: High Performance Mail Server - http://surgemail.com r=1653887525 Cc: Subject: Re: Pre-loaded mfsroot size and FreeBSD 4.9 with 4G RAM X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 13 Feb 2006 17:07:57 -0000 On Sunday 12 February 2006 00:37, Sergey Babkin wrote: > Jacques Fourie wrote: > > I have installed 6.0-RELEASE and the behaviour is still the same. If I > > try to pre-load an md_image of 64M with 4G of RAM installed, the kernel > > panics early in the boot cycle. Here is the panic on 6.0-RELEASE: > > > > 131072K of memory above 4GB ignored > > This is a kind of stupid question but is there any chance that the 64MB > image overlaps with the PCI address hole? To elaborate: with > 4GB memory installed there would be no address range to access the > memory-mapped 32-bit PCI cards. So the motherboard circuitry > relocates some amount of memory (the 128MB shown above) from > some lower address to above 4GB and frees this address space below > 4GB for mapping of the PCI cards. So the interesting question > is: what is the address of this PCI hole and what is the loading > address of the FreeBSD md_image? If they overlap then naturally > a part of the image would go into nowhere and cause a panic. > > On my machine this PCI hole can be disabled in BIOS (I think so, > there is also some kind of configuration in BIOS but I did > not pay much attention to it as I don't have 4GB). No, that won't happen as the mfsroot is loaded into RAM, and RAM doesn't conflict with the PCI addreses. -- John Baldwin <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org