From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with archive (Exim 4.43) id 1KbYH4-0008Nb-2K for mharc-grub-devel@gnu.org; Fri, 05 Sep 2008 06:10:42 -0400 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1KbYGy-0008MV-PL for grub-devel@gnu.org; Fri, 05 Sep 2008 06:10:37 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1KbYGx-0008M7-C3 for grub-devel@gnu.org; Fri, 05 Sep 2008 06:10:35 -0400 Received: from [199.232.76.173] (port=43901 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1KbYGw-0008Lu-RZ for grub-devel@gnu.org; Fri, 05 Sep 2008 06:10:35 -0400 Received: from aybabtu.com ([69.60.117.155]:51182) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1KbYGx-0003Sf-0M for grub-devel@gnu.org; Fri, 05 Sep 2008 06:10:35 -0400 Received: from [192.168.10.10] (helo=thorin) by aybabtu.com with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.69) (envelope-from ) id 1KbY6U-0001y8-7j for grub-devel@gnu.org; Fri, 05 Sep 2008 11:59:47 +0200 Received: from rmh by thorin with local (Exim 4.63) (envelope-from ) id 1KbYFH-0001Ux-T5 for grub-devel@gnu.org; Fri, 05 Sep 2008 12:08:51 +0200 Date: Fri, 5 Sep 2008 12:08:51 +0200 From: Robert Millan To: The development of GRUB 2 Message-ID: <20080905100851.GD5220@thorin> References: <48BED2B2.1060000@gmail.com> <20080904194015.GF9133@thorin> <48C057E1.6050401@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <48C057E1.6050401@gmail.com> Organization: free as in freedom X-Message-Flag: Worried about Outlook viruses? Switch to Thunderbird! www.mozilla.com/thunderbird X-Debbugs-No-Ack: true User-Agent: Mutt/1.5.13 (2006-08-11) X-detected-kernel: by monty-python.gnu.org: Genre and OS details not recognized. Subject: Re: Multiple partition maps X-BeenThere: grub-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: The development of GRUB 2 List-Id: The development of GRUB 2 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 Sep 2008 10:10:37 -0000 On Thu, Sep 04, 2008 at 11:49:21PM +0200, phcoder wrote: > Robert Millan wrote: > > On Wed, Sep 03, 2008 at 08:08:50PM +0200, phcoder wrote: > >> Hello. I was looking at the grub code and seen that if a disk has > >> multiple partition tables (e.g. macintel with bootcamp) then only first > >> one will be detected. In some cases it can lead to unreachable > >> partitions if for some reason partition is present only in one table. > >> Does anyone has an idea how theese cases may be treated compactly and > >> efficiently? > > > > Strictly speaking, GPT+MSDOS hybrid tables are a violation of the GPT > > specification. It's not clear what would be the "correct" way of handling > > them. > > > > Since we're not a legacy program, I suppose the sane thing to do would be > > to abort MSDOS probing if a protective DOS partition (0xee) is found, and > > then only GPT will be used. > > We're not a legacy application but some OS and partition tools are and > we have to work with them. I think just some maintenance tools included > in GRUB should be enough. I'll write them soon. (perhaps even tomorrow) I don't understand. Which kind of maintenance do you mean? GRUB isn't designed to modify partition maps, only read them. Perhaps what you want is more related to Parted? > > Isn't this what GRUB does already? I thought it would be... > > > It does. But I don't know if there are other cases similar to this one. There's also grub-setup. On an hybrid map the only option is to follow the GPT install path and search for a BIOS boot partition (or otherwise use blocklists). Does it DTRT already? I don't know of any other similar situation. -- Robert Millan The DRM opt-in fallacy: "Your data belongs to us. We will decide when (and how) you may access your data; but nobody's threatening your freedom: we still allow you to remove your data and not access it at all."