Date: Tue, 19 Jan 2010 14:51:09 -0500 From: Mike Andrews <mandrews@bit0.com> To: freebsd-stable@freebsd.org Subject: Re: 8.0-RELEASE / gpart / GPT / marking a partition as "active" Message-ID: <4B560D2D.30404@bit0.com> In-Reply-To: <cf9b1ee01001190911r52e51f1dn46bdeda4e15c1c97@mail.gmail.com> References: <cf9b1ee01001190911r52e51f1dn46bdeda4e15c1c97@mail.gmail.com>
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On 1/19/2010 12:11 PM, Dan Naumov wrote: > It seems that quite a few BIOSes have serious issues booting off disks > using GPT partitioning when no partition present is marked as > "active". See http://www.freebsd.org/cgi/query-pr.cgi?pr=115406&cat=bin > for a prime example. > > In 8.0-RELEASE, using gpart, setting a slice as "active" in MBR > partitioning mode is trivial, ie: > > gpart set -a active -i 1 DISKNAME > > However, trying to do the same thing with GPT partitioning yields no results: > > gpart set -a active -i 1 DISKNAME > gpart: attrib 'active': Device not configured > > As a result of this issue, I can configure and make a succesfull > install using GPT in 8.0, but I cannot boot off it using my Intel > D945GCLF2 board. > > I have found this discussion from about a month ago: > http://www.mail-archive.com/freebsd-stable@freebsd.org/msg106918.html > where Robert mentions that "gpart set -a active -i 1" is no longer > needed in 8-STABLE, because the pmbr will be marked as active during > the installation of the bootcode. Is there anything I can do to > archieve the same result in 8.0-RELEASE or is installing from a > snapshop of 8-STABLE my only option? After using gpart to create the GPT (and thus the PMBR and its bootcode), why not simply use "fdisk -a -1 DISKNAME" to set the PMBR partition active?
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