[Bug 237808] Ampere eMAG efibootmgr stuck when creating a new entry

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237808

            Bug ID: 237808
           Summary: Ampere eMAG efibootmgr stuck when creating a new entry
           Product: Base System
           Version: CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: arm
          Assignee: freebsd-arm at FreeBSD.org
          Reporter: manu at freebsd.org

Ting Ngyuen and John O'Neill reported that the installer is stuck when it
creates the boot entry with efibootmgr(8) on their Osprey hardware.
I managed to confirm this on the Lenovo HR350A at emaste@'s office.
Step to reproduce (runned from the pxe booted system) :
root@:~ # mount_msdosfs /dev/ada0p1 /mnt/
root@:~ # mkdir -p /mnt/EFI/freebsd
root@:~ # cp /boot/loader.efi /mnt/EFI/freebsd/
root@:~ # efibootmgr --create --activate --label FreeBSD --loader
/mnt/EFI/freebsd/loader.efi 

Then efibootmgr is stuck and isn't interruptable.
I'll look at this.

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