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Date:      Mon, 18 Jul 2022 14:52:30 +0000
From:      Glen Barber <gjb@freebsd.org>
To:        Mark Millard <marklmi@yahoo.com>
Cc:        dev-commits-src-main@freebsd.org, Warner Losh <imp@bsdimp.com>
Subject:   Re: git: 1dfcff294e44 - main - release: increase IMAGE_SIZE for arm, arm64, riscv
Message-ID:  <20220718145230.GB95937@FreeBSD.org>
In-Reply-To: <037C78F9-CA37-4D1C-8F68-22A85183E8AF@yahoo.com>
References:  <7F4F9683-B4DE-4F65-BBD7-027039A0C270@yahoo.com> <20220713204227.GA30607@FreeBSD.org> <8A02A4A4-9F3A-47F2-9985-EA2151043BB7@yahoo.com> <4D903E5A-58FB-4516-AC53-AEDFF48564A7@yahoo.com> <20220714152125.GB30607@FreeBSD.org> <3E2DCFBD-CC8F-4C13-B18C-B7DA26ED8E84@yahoo.com> <AE47C47B-33F7-4236-8A23-688C40340EA7@yahoo.com> <DBED097F-00BD-467C-8CA3-49857DA35456@yahoo.com> <20220718140851.GA95937@FreeBSD.org> <037C78F9-CA37-4D1C-8F68-22A85183E8AF@yahoo.com>

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On Mon, Jul 18, 2022 at 07:34:40AM -0700, Mark Millard wrote:
> On 2022-Jul-18, at 07:08, Glen Barber <gjb@freebsd.org> wrote:
>=20
> > On Sat, Jul 16, 2022 at 11:24:47PM -0700, Mark Millard wrote:
> >>=20
> >>=20
> >> On 2022-Jul-15, at 17:41, Mark Millard <marklmi@yahoo.com> wrote:
> >>=20
> >>> FYI for the new snapshot build of 13.1-STABLE:
> >>>=20
> >>> # mdconfig -u0 -f FreeBSD-13.1-STABLE-arm64-aarch64-RPI-20220715-831c=
6b8edda-251792.img=20
> >>> # gpart show md0
> >>> =3D>      63  10485697  md0  MBR  (5.0G)
> >>>       63      2016       - free -  (1.0M)
> >>>     2079    102312    1  fat32lba  [active]  (50M)
> >>>   104391  10381329    2  freebsd  (5.0G)
> >>> 10485720        40       - free -  (20K)
> >>>=20
> >>> So: still has the 2016 and 2079 that do not seem to match
> >>> what /usr/src/release/ materials would indicate --and the
> >>> 2079 leads to poor alignment for a microsd cards, for
> >>> example.
> >>>=20
> >>> But, at least something was produced this time. There is
> >>> now a 13.1-STABLE snapshot to test the handling related
> >>> to the new UFS/FFS superblock validations.
> >>=20
> >> In the live build environment that makes the images,
> >> what is:
> >>=20
> >> # sysctl kern.geom.part.mbr.enforce_chs
> >> kern.geom.part.mbr.enforce_chs: 0
> >>=20
> >> I ask because of the description:
> >>=20
> >> QUOTE
> >>     kern.geom.part.mbr.enforce_chs: 0
> >>             Specify how the Master Boot Record (MBR) module does align=
ment.
> >>             If this variable is set to a non-zero value, the module wi=
ll
> >>             automatically recalculate the user-specified offset and si=
ze for
> >>             alignment with the CHS geometry.  Otherwise the values wil=
l be
> >>             left unchanged.
> >> END QUOTE
> >>=20
> >> In particular, the text about non-zero values leading to:
> >>=20
> >> QUOTE
> >> the module will
> >>             automatically recalculate the user-specified offset and si=
ze for
> >>             alignment with the CHS geometry
> >> END QUOTE
> >>=20
> >> This sounds like a potential way to not end up with the
> >> what the /usr/src/release handling requests for the
> >> small board computer images. It might explain the
> >> mismatched alignment that I've been reporting.
> >>=20
> >=20
> > It is set to '1' on all three systems.  If this is causing a problem, it
> > is weird we have a problematic setting as the default.
> >=20
>=20
> 0 is the default that shows up on the systems
> that I have access to.
>=20
> It has not been the default since 2014-08-12:
>=20

Oh, the builders have it set in /etc/sysctl.conf, and if I recall
correctly, it was in order to address another problem.  I'm digging
through my email archives to find out what the other problem was
exactly, but my memory is a bit fuzzy on the details.

Glen


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