Date: Tue, 19 Jan 2010 23:03:00 -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: <4B568074.4020909@bit0.com> In-Reply-To: <cf9b1ee01001191309u66492d80rd1500329deceb6d1@mail.gmail.com> References: <cf9b1ee01001190911r52e51f1dn46bdeda4e15c1c97@mail.gmail.com> <4B55FF44.4040308@icyb.net.ua> <cf9b1ee01001191309u66492d80rd1500329deceb6d1@mail.gmail.com>
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On 1/19/10 4:09 PM, Dan Naumov wrote: > 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? Yes, just ignore it.
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