Nothing further has been heard. Was bug #989560 resolved by updating to the GRUB 2.04 packages? Possibly as part of upgrading to bullseye?
The provided information looks like what one might expect from trying to load Xen on ARM via GRUB 2.02. As such I'm left suspecting this was resolved by updating. -- (\___(\___(\______ --=> 8-) EHM <=-- ______/)___/)___/) \BS ( | ehem+sig...@m5p.com PGP 87145445 | ) / \_CS\ | _____ -O #include <stddisclaimer.h> O- _____ | / _/ 8A19\___\_|_/58D2 7E3D DDF4 7BA6 <-PGP-> 41D1 B375 37D0 8714\_|_/___/5445