[Bug 254490] REGRESSION: Hybrid disc1.iso fails to boot from USB on BIOS/Legacy ThinkPads and other systems

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254490

--- Comment #9 from Michael Dexter <editor at callfortesting.org> ---
Thank you Mark, mzar and Allan Jude for pointing out the Log view! This is a
new tool to all of us.

These emerge as the "usual suspects" for incorrectly-built ISOs but are not
guaranteed to be responsible for the regression:

https://cgit.freebsd.org/src/log/usr.sbin/makefs
https://cgit.freebsd.org/src/log/release

If I am not mistaken, this is the date range where the regression was
introduced:
Update to BETA4 2021-02-26
Update to RC1   2021-03-05

Within that range these commits stand out for me as possible causes but I
cannot say for sure without bisecting and building:

efibootmgr: Check for efi supported after parsing args  2021-03-01
mkimg: We always want the last block of the last inserted partition 2021-03-02
mkimg: Add support for offset if the source is an image 2021-03-02

Michael

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