[Bug 247845] FreeBSD does not boot when UEFI bootvar entry does not exist in NVRAM

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247845

            Bug ID: 247845
           Summary: FreeBSD does not boot when UEFI bootvar entry does not
                    exist in NVRAM
           Product: Base System
           Version: 12.1-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: michael.osipov at siemens.com

I'll try to be as detailed as possible:
I have a Fujitsu CELSIUS W410 which has M/B D3062-A13 by Fujitsu. The fireware
version is up to date: V4.6.4.0 - R1.29.0 (18.06.2015). Yes, the machine is
old. I have unplugged all drives which still contain Windows to avoid any
issues during installation/boot.
The firmware config is set to UEFI mode only, no CSM, no ATAPI. Pure new mode.
Downloaded FreeBSD-12.1-STABLE-amd64-20200702-r362880-memstick.img and wrote to
a stick with Rufus. The firmware properly shows it as "UEFI: <stick name>". The
FreeBSD EFI loader comes up and I am can install the system.
I have selected Auto (UFS) on the 60 GB SSD, bsdinstall created ESP, ufs for /
and swap. Reboot the system, nothing happens. ESP DOES contain the default
loader, but not picked up by the system. After some digging I have found:
https://forums.freebsd.org/threads/cant-boot-on-uefi.68141/#post-406138.
efibootmgr -v does not show any bootvar in NVRAM. Strage. Added manually one,
the system started to boot, even "gop list" works.
Tried FreeBSD-13.0-CURRENT-amd64-20200702-r362853-memstick.img, installed the
same way with UFS, there is a bootvar in NVRAMm, it has been created
automatically.
After some search I have found:
https://github.com/freebsd/freebsd/blob/master/usr.sbin/bsdinstall/scripts/bootconfig#L151-L152
which does not exist fo 12-STABLE:
https://github.com/freebsd/freebsd/blob/4df7391aa971ab3c1ac672de3eb5ed72a384b58f/usr.sbin/bsdinstall/scripts/bootconfig#L38-L39

My understanding is that FreeBSD 12 relies on the default fallback loader while
the UEFI implementation of my M/B does not locate it on disk although this one
has been selected for boot. I guess my firmware is buggy, but FreeBSD 12 does
not know about that. Since 12 is the latest and greatest for the years to come,
I expect some better handling: either an explicit bootvar or or warning that
the fallback might not always work on all systems. Others will trip with way
less knowledge to dig into.

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