Just have an APU2 here for testing. While installing FreeBSD I was stuck since I always used the serial image from OPNsense.
So when you need to install vanilla FreeBSD escape the loader prompt with „3“ and put in:
set boot_multicons="YES"
set boot_serial="YES"
set comconsole_speed="115200"
set console="comconsole,vidconsole"
set kern.cam.boot_delay="10000"
boot