Date: Tue, 19 Jan 2010 23:09:09 +0200 From: Dan Naumov <dan.naumov@gmail.com> To: Andriy Gapon <avg@icyb.net.ua>, mandrews@bit0.com Cc: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org>, freebsd-questions@freebsd.org, rnoland@freebsd.org, freebsd-geom@freebsd.org Subject: Re: 8.0-RELEASE / gpart / GPT / marking a partition as "active" Message-ID: <cf9b1ee01001191309u66492d80rd1500329deceb6d1@mail.gmail.com> In-Reply-To: <4B55FF44.4040308@icyb.net.ua> References: <cf9b1ee01001190911r52e51f1dn46bdeda4e15c1c97@mail.gmail.com> <4B55FF44.4040308@icyb.net.ua>
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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? According to the fdisk output, the partition flag did change from 0 to 80. Can the "fdisk: Class not found" error showing up at the very end of the procedure of doing "fdisk -a -1 DISKNAME" be safely ignored? - Dan Naumov
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