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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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