Date: Tue, 28 Jun 2011 04:10:06 +0200 From: Gyrd Thane Lange <gyrd-se@thanelange.no> To: freebsd-questions@freebsd.org Cc: doug@safeport.com, perryh@pluto.rain.com Subject: Re: Dual Boot 8.2 and Windows 7 Message-ID: <20110628041006.256ac7bf@parvati.thanelange.no> In-Reply-To: <20110628015216.386bf8c6@parvati.thanelange.no> References: <alpine.BSF.2.00.1106231919320.83085@oceanpt.safeport.com> <D7EC3198-B917-4ACB-9BC2-ACE6D5569C07@my.gd> <4D7F86D5012E084A@> <alpine.BSF.2.00.1106240933580.83085@oceanpt.safeport.com> <4e05220e.GBAaOafCcTgMjymv%perryh@pluto.rain.com> <20110626202852.6765f935@parvati.thanelange.no> <4e08b653.f21Zod5W%2BPPBQkwI%perryh@pluto.rain.com> <20110628015216.386bf8c6@parvati.thanelange.no>
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On Tue, 28 Jun 2011 01:52:16 +0200 Gyrd Thane Lange <gyrd-se@thanelange.no> wrote: > On Mon, 27 Jun 2011 09:56:51 -0700 > perryh@pluto.rain.com wrote: > > > Gyrd Thane Lange <gyrd-se@thanelange.no> wrote: > > > > > On Fri, 24 Jun 2011 16:47:26 -0700 > > > perryh@pluto.rain.com wrote: > > > > > > > ... The code in i386/boot2 and > > > > lib/libstand is written to find the / (or /boot) FS on a > > > > BSD partition of an fdisk "primary partition" (aka slice), > > > > or in a GPT partition, and would need additions to handle > > > > fdisk "extended partitions". > > > > > > Some years ago I ran into a similar problem. I ran out of primary > > > partitions (using MBR-speak) and had to move FreeBSD into an > > > extended partition. > > > > > > Here the simple patch I wrote for the FreeBSD boot loader: > > > <http://parvati.thanelange.no/freebsd/boot_loader/boot_loader.diff>; > > > <http://parvati.thanelange.no/freebsd/boot_loader/>; > > > > Any thought of submitting that as a PR? > > I've always meant to submit it as a PR, but found the send-pr(1) too > daunting. (It is impossible/undesirable for me to have a working mail > sender on my system and I have not yet found a way for send-pr(1) to > work in offline mode for delayed sending by a different machine.) I > suppose I could give the HTML version a try... <http://www.freebsd.org/cgi/query-pr.cgi?pr=158358>; kern/158358: [patch] allow /boot/loader to work from an MBR extended partition > > > The next challenge is to find a boot manager that will pick up > > > FreeBSD in an extended partition. For myself I use a self patched > > > GRUB. (GRUB also nearly worked out of the box, but had a different > > > problem.) > > > > It makes sense that GRUB would understand "extended partitions" > > since its roots are in Linux which is often installed in extended > > partitions. Ideally FreeBSD should have a native solution, i.e. > > a version of boot2 that would understand extended partitions. > > Dunno without trying it if the capability could be added to the > > existing boot2 without exceeding available space, or if it would > > need a new variant. > > I agree that would have been more convenient, but since MBR is going > the way of the dodo I haven't looked that closely into it. > > > > You're welcome to have those patches as well if you need them. > > > > It would be good to get them posted somewhere. GRUB is not in the > > FreeBSD tree AFAIK, so send-pr is likely not all that good a method, > > but perhaps they could be pushed upstream to the GRUB maintainers? > > The problem with GRUB was computing the correct absolute start sector > of FreeBSD partitions, as in bsdlabel(8), when they resided in > "extended partitions". More details are available as comments in the > patch. > > <http://parvati.thanelange.no/freebsd/grub/patch-ufs-in-logical-partition>; > All that's required is to drop the file into: > > /usr/ports/sysutils/grub/files/ > > and then build the port, install grub, e.t.c. > > I can make a PR for it against the sysutils/grub port. I'll also look > into how to push it upstream. I have filed the following PR: <http://www.freebsd.org/cgi/query-pr.cgi?pr=158362>; ports/158362: sysutils/grub [patch] allow GRUB to boot FreeBSD from an extended partition While doing so I discovered another one with a similar theme. <http://www.freebsd.org/cgi/query-pr.cgi?pr=ports/152389>; ports/152389: sysutils/grub and sysutils/grub2 misinterpret disklabels created with bsdlabel Gyrd ^_^
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