Date: Mon, 18 Jul 2022 07:34:40 -0700 From: Mark Millard <marklmi@yahoo.com> To: Glen Barber <gjb@freebsd.org> 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: <037C78F9-CA37-4D1C-8F68-22A85183E8AF@yahoo.com> In-Reply-To: <20220718140851.GA95937@FreeBSD.org> References: <84410D65-6F86-44E5-8B14-8A523C9919C7@yahoo.com> <20220713201327.GY30607@FreeBSD.org> <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>
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On 2022-Jul-18, at 07:08, Glen Barber <gjb@freebsd.org> wrote:
> 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-20220715-831c6b8edda-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 =
alignment.
>> If this variable is set to a non-zero value, the module =
will
>> automatically recalculate the user-specified offset and =
size for
>> alignment with the CHS geometry. Otherwise the values =
will 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 =
size 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
0 is the default that shows up on the systems
that I have access to.
It has not been the default since 2014-08-12:
author Andrey V. Elsukov <ae@FreeBSD.org> 2014-08-12 10:31:31 =
+0000
committer Andrey V. Elsukov <ae@FreeBSD.org> 2014-08-12 =
10:31:31 +0000
commit 36b16d1f7d1bb7fba28a92aaf802bf4cfbfbb41f (patch)
tree cc947686f44a14cc26f61bf64cdb06d7dab35fb3 =
/sys/geom/part/g_part_mbr.c
parent a327e0b08aa16a3fbce30b21be7f59363db035a6 (diff)
download src-36b16d1f7d1bb7fba28a92aaf802bf4cfbfbb41f.tar.gz
src-36b16d1f7d1bb7fba28a92aaf802bf4cfbfbb41f.zip
Turn off kern.geom.part.mbr.enforce_chs by default.
Notes
Notes:
svn path=3D/head/; revision=3D269857
Diffstat (limited to 'sys/geom/part/g_part_mbr.c')
-rw-r--r-- sys/geom/part/g_part_mbr.c 4=09
1 files changed, 2 insertions, 2 deletions
diff --git a/sys/geom/part/g_part_mbr.c b/sys/geom/part/g_part_mbr.c
index 8b32778d23df..5073398c954c 100644
--- a/sys/geom/part/g_part_mbr.c
+++ b/sys/geom/part/g_part_mbr.c
@@ -53,9 +53,9 @@ SYSCTL_DECL(_kern_geom_part);
static SYSCTL_NODE(_kern_geom_part, OID_AUTO, mbr, CTLFLAG_RW, 0,
"GEOM_PART_MBR Master Boot Record");
=20
-static u_int enforce_chs =3D 1;
+static u_int enforce_chs =3D 0;
SYSCTL_UINT(_kern_geom_part_mbr, OID_AUTO, enforce_chs,
- CTLFLAG_RWTUN, &enforce_chs, 1, "Enforce alignment to CHS =
addressing");
+ CTLFLAG_RWTUN, &enforce_chs, 0, "Enforce alignment to CHS =
addressing");
=20
#define MBRSIZE 512
=3D=3D=3D
Mark Millard
marklmi at yahoo.com
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