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Date:      Thu, 9 Jul 2020 09:39:38 -0400
From:      Karl Denninger <karl@denninger.net>
To:        freebsd-stable@freebsd.org
Subject:   Re: 12.1p7 no longer boots after doing zpool upgrade -a
Message-ID:  <2978600c-84db-a5c9-866e-0a68642b0e0c@denninger.net>
In-Reply-To: <c82ee674-64fd-d9fd-6d1c-ee3cfbb682c6@ingresso.co.uk>
References:  <20200709131201.GA3464@co.gvr.org> <CACNAnaGbCknS18yLv1ow2FFnj5xSMHXQZgxfRPMUMTb5ujB=fw@mail.gmail.com> <c82ee674-64fd-d9fd-6d1c-ee3cfbb682c6@ingresso.co.uk>
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[-- Attachment #1 --]
On 7/9/2020 09:32, Pete French wrote:
>
> On 09/07/2020 14:24, Kyle Evans wrote:
>
>>> gpart bootcode -p /boot/boot1.efifat -i 1 ada0
>>> gpart bootcode -p /boot/boot1.efifat -i 1 ada1
>>
>>
>> This method of updating the ESP is no longer recommended for new 12.x
>> installations -- we now more carefully construct the ESP with an
>> /EFI/FreeBSD/loader.efi where loader.efi is /boot/loader.efi. You will
>> want to rebuild this as such, and that may fix part of your problem.
>
> Out of interest, how should the ESP partition be upgraded then ? I
> dont have any EFI machines...yet. But one day I will, and I was
> assuming that an upgrade would be done using the above lines too.
>
Nope.  An EFI partition is just a "funky" MSDOS (FAT) one, really.  Thus
the upgrade of the loader on one would be just a copy onto it as with
any other file on a filesystem (e.g. mount the partition, copy the file
to the correct place, unmount it); the gpart command does a byte-copy
onto what is, for all intents and purposes, an unformatted (no
directory, etc) reserved part of the disk.

My laptop dual boot (Windows 10 / FreeBSD) is EFI and I've yet to have
to screw with the loader, but if you do then it's just a copy over. 
Windows has several times blown up my Refind install -- all the
"Feature" upgrades from Windows have a habit of resetting the BIOS boot
order which makes the machine "Windows boots immediately and only", so I
have to go back and reset it whenever Microslug looses one of those on
me.  If I had cause to update the loader for FreeBSD then I'd just mount
the partition and copy it over.

-- 
Karl Denninger
karl@denninger.net <mailto:karl@denninger.net>
/The Market Ticker/
/[S/MIME encrypted email preferred]/

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