From owner-freebsd-amd64@FreeBSD.ORG Mon Oct 13 16:25:55 2008 Return-Path: Delivered-To: freebsd-amd64@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E8E411065687 for ; Mon, 13 Oct 2008 16:25:55 +0000 (UTC) (envelope-from freebsd@sopwith.solgatos.com) Received: from parsely.rain.com (parsely.rain.com [199.26.172.196]) by mx1.freebsd.org (Postfix) with ESMTP id 69EF78FC1C for ; Mon, 13 Oct 2008 16:25:54 +0000 (UTC) (envelope-from freebsd@sopwith.solgatos.com) Received: from sopwith.solgatos.com (uucp@localhost) by parsely.rain.com (8.11.4/8.11.4) with UUCP id m9DGPpC16066 for freebsd-amd64@freebsd.org; Mon, 13 Oct 2008 09:25:51 -0700 (PDT) (envelope-from freebsd@sopwith.solgatos.com) Received: from localhost by sopwith.solgatos.com (8.8.8/6.24) id QAA13636; Mon, 13 Oct 2008 16:22:42 GMT Message-Id: <200810131622.QAA13636@sopwith.solgatos.com> To: freebsd-amd64@freebsd.org In-reply-to: Your message of "Mon, 13 Oct 2008 11:25:41 -0200." <200810131125.41343.joao@matik.com.br> Date: Mon, 13 Oct 2008 09:22:42 +0100 From: Dieter Subject: Re: am2 MBs - 4g + SCSI wipes out root partition 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, 13 Oct 2008 16:25:56 -0000 > > It sounds as if there's an implementation/design problem either in > > FreeBSD's hardware compatibility support for AM2 (probably something > > very low-level) systems, or there is a bug with these Gigabyte boards; > > good, but it is not only gigabyte, I experienced it on Asus, Abit, Epox and= > =20 > MSI =20 Perhaps something common in the firmware/BIOS ? > all this MBs have in common that when 4Gig is installed the full 4gig are=20 > avaliable to the Os, on former S939 arquitecture, depending on mem hole=20 > remapping setting in BIOS there was +/-3.5gig or 4.+Gig available for amd6= > 4,=20 > mostly the remapping feature was not existent and then there was always=20 > +/-3.5 Gig available Is there some debugging flag to turn on that shows what the firmware/BIOS says about addresses, and the final address map (both RAM and I/O devices) as used by FreeBSD? > > it could be either, or possibly both. It might work in Linux because, > > for all we know, Linux may have workarounds in place for whatever the > > problem may be. We simply do not know at this point. IIUC, Linux uses the firmware/BIOS as little as possible and does everything itself. Which is why *BSD can't run on LinuxBIOS.