Date: Tue, 7 Dec 2010 19:09:53 +0100 From: joost@jodocus.org To: "David DEMELIER" <demelier.david@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: can't mount root during freebsd-update 7.0 -> 8.1 on amd64 Message-ID: <b79e6d97c9d4c7cbd623dcb943a8800f.squirrel@jodocus.org> In-Reply-To: <AANLkTikPSSTeOWHbKfypisrdRjrA7uPP_GMRZ5qNkHsT@mail.gmail.com> References: <d4da7a77756c4678132be5f2a147ce56.squirrel@jodocus.org> <AANLkTikPSSTeOWHbKfypisrdRjrA7uPP_GMRZ5qNkHsT@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
> 2010/12/5 <joost@jodocus.org>: >> Hi >> >> I'm trying to upgrade a amd64 box from 7.0-RELEASE to 8.1-RELEASE with >> freebsd-update. After the first reboot the 8.1R GENERIC kernel loads >> (I'm >> using a custom kernel, so at this point the generic kernel is loaded >> manually) >> It then claims it can't mount / >> > > GEOM_PART becomes the default slicer > > Status: Committed to -CURRENT > Will appear in 8.0: sure > Author: Marcel Moolenaar & others > Web: commit message > > GEOM_PART (gpart) is a new GEOM partition class (slicer) and utility > that rolls up support for many partitioning formats (MBR, BSD, GPT > etc.) into a single code base. > > NOTE: Caveat when upgrading! GEOM_PART might interpret existing > partition tables (especially if many operating systems are present - > multi boot) differently than the previous classes. Your devices might > get renamed. > > NOTE: Some old utilities like bsdlabel may not work if the kernel > doesn't include GEOM_BSD and other old slicer classes. In other words, > bsdlabel et al don't work with GEOM_PART. > > Maybe you're encountering this trouble right now. what I would advise > you is using labels. Please do the following : > > tunefs -L root /dev/ad4a > tunefs -L var /dev/ad4e (assuming it's e on your system ?) > and for usr, tmp, etc ... > >>From a fixit environment. then edit your /etc/fstab and place > /dev/ufs/root /dev/ufs/var instead of hardcoding the device node. > Adding labels to the partitions doesn't help. I've tried both UFS and GEOM labels. You did point me in the right direction though. If I load geom_mbr my partitions show up and all is well. I think it was actually the slice that wasn't recognized. geom_part should have recognized the mbr, right? I've scanned g_part_mbr_probe() and all the checks it does should succeed. DOSMAGIC is there. The first byte of each row in the partition table is either 0x80 of 0x00. geom_part seems to do first match when probing. is there a way for me to find out which geom_part_* module is staking a claim on my mbr? I'm assuming I'm not the first person to try 8.x on amd64 with an mbr on a disk so there must be something 'special' with this system... Joost.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?b79e6d97c9d4c7cbd623dcb943a8800f.squirrel>