Crossbuilding ARM64 results in a bootable system that emits devmatch errors: Starting devd. devmatch: Can't read linker hints file. devmatch: Can't read linker hints file. devmatch: Can't read linker hints file. This is repaired by running kldxref -R /boot
Also noticed on riscv64 (Beagle-V) 20210606.
This should now be fixed in recent main as kldxref is now a cross-tool. The changes have not yet been merged anywhere though I will likely merge them at least for 14.1 (not sure if they will merge back cleanly to stable/13).