Created attachment 224577 [details]
Screenshot from ip-kvm.
I have a ASUS RS500-E6-PS4 server.
On the first boot after installation 13.0-RELEASE hangs at "FreeBSD/x86 bootstrap loader, Revision 1.1".
After few tries I decided to install 12.2-RELEASE and upgrade to 13.0-RELEASE manually. 12.2 boots fine without any suspicious messages in dmesg.
After "freebsd-update -R 13.0-RELEASE upgrade" I was asked to reboot and system hangs again.
Root FS is on raidz1.
From discussions that I have seen elsewhere (not in Bugzilla), solved, I suspect that this is not a base system bug.
<https://forums.freebsd.org/> might be a good place to start; or the freebsd-questions list. Please cross-reference.