Just FIY since nothing relevant was found at google.
I was upgrading my CURRENT system to rev r268233 from a one-or-two
weeks old system. The system was created years ago and had rather
old zfsboot code. So, after upgrading and rebooting I got the error
right after BIOS POST...:
"ZFS: unsupported compression algorithm 15"
... and instant reboot.
OK, I've booted from a USB stick, run the command (the system in
question is at /dev/ada1 and the system at USB stick is rather new
# gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 ada1
Now my system is fine again:
% uname -a
FreeBSD bsam.int.wart.ru 11.0-CURRENT FreeBSD 11.0-CURRENT #73 r268233:
Fri Jul 4 06:41:28 SAMT 2014
WBR, Boris Samorodov (bsam)
FreeBSD Committer, http://www.FreeBSD.org The Power To Serve
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