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Date:      Tue, 1 Feb 2022 10:02:55 +0100
From:      =?UTF-8?Q?Ulrich_Sp=C3=B6rlein?= <uqs@freebsd.org>
To:        Andriy Gapon <avg@freebsd.org>
Cc:        Tomoaki AOKI <junchoon@dec.sakura.ne.jp>, Eugene Grosbein <eugen@grosbein.net>,  freebsd-stable@freebsd.org
Subject:   Re: gptzfsboot can't boot from 4TB SSD
Message-ID:  <CAJ9axoRt=U08zJeHJSZ5SGeTcGKr27B10Jny41qutVukizk-JA@mail.gmail.com>
In-Reply-To: <275959c1-60e0-623b-6e95-f892d7ab8566@FreeBSD.org>
References:  <YfKkr%2BmC6rMrRlF9@acme.spoerlein.net> <212cfd90-056f-d294-ae9c-fd2b632ae679@FreeBSD.org> <CAJ9axoRneWhE61k-o0xTH04wyLQnoeNwD6Y2myR0vnvD1Q01Vg@mail.gmail.com> <f321250d-2d27-b1ea-9525-0b4aaf80d05d@grosbein.net> <CAJ9axoQPCxiAMRn4BxCfnVMj4ggbumwyGg3schKg78=fmK%2B8pQ@mail.gmail.com> <20220130030618.dd46cf514f98cdfa6caa1ad4@dec.sakura.ne.jp> <CAJ9axoQbCdOs8SvOn%2B2-QUtdpyE5moQuQk_CRBsdkar4yWY2dw@mail.gmail.com> <275959c1-60e0-623b-6e95-f892d7ab8566@FreeBSD.org>

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On Sat, Jan 29, 2022 at 11:43 PM Andriy Gapon <avg@freebsd.org> wrote:
>
> On 29/01/2022 23:49, Ulrich Sp=C3=B6rlein wrote:
> > This output is from_before_  loader is loaded
>
> What gives you confidence in that?
> Do you know exact moment where execution passes from gpt(zfs)boot to load=
er?

Huh, you are right. strings(1) confirmed that the messages could come
from both gptzfsloader as well as from loader. My assumption was that
the version string of the loader would be printed as early as
possible, but now that I've opened stand/i386/loader/main.c, I see
that bootprog_info gets printed very, very late in the process, after
all the GPT and ZFS frobbing was already done, though I don't see an
obvious, definitive call to probing ZFS there and then, it only sets
up some stuff.

Anyway, that mystery will have to wait for some other time

Cheers
Uli



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