Date: Thu, 10 Jul 2014 09:25:58 -0600 (MDT) From: Warren Block <wblock@wonkity.com> To: Luciano Mannucci <luciano@vespaperitivo.it> Cc: freebsd-questions@freebsd.org Subject: Re: Repairing boot Message-ID: <alpine.BSF.2.11.1407100919210.92272@wonkity.com> In-Reply-To: <20140710151359.58BB2A64@hub.freebsd.org> References: <20140710151359.58BB2A64@hub.freebsd.org>
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On Thu, 10 Jul 2014, Luciano Mannucci wrote:
>
> Hi gurus!
> I'm new to freebsd (I come from linux/solaris/hp-ux). I've messed up
> my startup after upgrading from 9.1 to 9.2 some time ago. Today I
> tried to repair my foxconn amd64 small box via the command
>
> # boot0cfg -B -s 2 /dev/ada0
>
> But if I try to boot I get
>
> F2 ?
> F6 PXE
>
> Boot: F1
>
> and it doesn't do anything. If I bootstrap starting from an USB key,
> escaping to boot prompt, issuing a set currdev=disk2p2 followed by
> boot-conf does the trick.
>
> what have I missed?
"p2" suggests the disk has a GPT partitioning scheme. The old boot0
multi-boot loader is not meant for GPT, only MBR. Writing the normal
GPT bootcode will fix that particular problem.
Use 'gpart show' to verify that the disk is using GPT and the partition
number of the freebsd-boot partition. For example:
% gpart show ada0
=> 34 500118125 ada0 GPT (238G)
34 6 - free - (3.0K)
40 1024 1 freebsd-boot (512K)
1064 984 - free - (492K)
2048 4194304 2 freebsd-ufs (2.0G)
4196352 4194304 3 freebsd-ufs (2.0G)
8390656 491727496 4 freebsd-ufs (234G)
500118152 7 - free - (3.5K)
The first line shows that this disk uses GPT partitioning.
In the third column, "1" is the partition number of the freebsd-boot
partition. To write the GPT bootcode:
# gpart bootcode -b /boot/pmbr -p /boot/gptboot -i 1 ada0
There might still be a problem booting if /etc/fstab refers to disks
rather than labels and the disk numbers have changed. If that happens,
please show the output of 'gpart show' and the contents of /etc/fstab.
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