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Date: Thu, 10 Jul 2014 20:02:45 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Luciano Mannucci <luciano@vespaperitivo.it>
Subject: Re: Repairing boot
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On Thu, 10 Jul 2014, Luciano Mannucci wrote:

> On Thu, 10 Jul 2014 09:25:58 -0600 (MDT)
> Warren Block <wblock@wonkity.com> wrote:
>>
>> # gpart bootcode -b /boot/pmbr -p /boot/gptboot -i 1 ada0
> Ok, done.
> Now I get:
>
> Invalid format.
> (a serie of numbers)
> BTX halted.

That is an unfamiliar error to me.  If you post the exact output, 
someone may recognize it.

>> 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.
> luke@puffo:~ % gpart show
> =>      0  7892992  da0  BSD  (3.8G)
>        0  1433920    1  freebsd-ufs  (700M)
>  1433920  6459072       - free -  (3.1G)
>
> =>       34  625142381  ada0  GPT  (298G)
>         34          6        - free -  (3.0k)
>         40        128     1  freebsd-boot  (64k)
>        168  608174080     2  freebsd-ufs  (290G)
>  608174248   16967680     3  freebsd-swap  (8.1G)
>  625141928        487        - free -  (243k)
>
> luke@puffo:~ % cat /etc/fstab
> # Device	Mountpoint	FStype	Options	Dump	Pass#
> /dev/ada0p2	/		ufs	rw	1	1
> /dev/ada0p3	none		swap	sw	0	0

This looks okay.  Could you post the output of 'file -s /dev/ada0p2'?