Re: git: 1dfcff294e44 - main - release: increase IMAGE_SIZE for arm, arm64, riscv

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:
> 
> > On Sat, Jul 16, 2022 at 11:24:47PM -0700, Mark Millard wrote:
> >> 
> >> 
> >> On 2022-Jul-15, at 17:41, Mark Millard <marklmi@yahoo.com> wrote:
> >> 
> >>> FYI for the new snapshot build of 13.1-STABLE:
> >>> 
> >>> # mdconfig -u0 -f FreeBSD-13.1-STABLE-arm64-aarch64-RPI-20220715-831c6b8edda-251792.img 
> >>> # gpart show md0
> >>> =>      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)
> >>> 
> >>> 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.
> >>> 
> >>> 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.
> >> 
> >> In the live build environment that makes the images,
> >> what is:
> >> 
> >> # sysctl kern.geom.part.mbr.enforce_chs
> >> kern.geom.part.mbr.enforce_chs: 0
> >> 
> >> I ask because of the description:
> >> 
> >> 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
> >> 
> >> In particular, the text about non-zero values leading to:
> >> 
> >> QUOTE
> >> the module will
> >>             automatically recalculate the user-specified offset and size for
> >>             alignment with the CHS geometry
> >> END QUOTE
> >> 
> >> 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.
> >> 
> > 
> > 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.
> > 
> 
> 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:
> 

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