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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