It is ZFS-only system and I have this line in /boot/loader.conf:
vfs.root.mountfrom="zfs:zroot"
With "boot -a -v -s" I got the same result that with "boot -s -v"
but when I enter zfs:zroot in mountroot prompt it printed:
Trying to mount root from zfs:zroot []...
mountroot: waiting for device zroot ...
Mounting from zfs:zroot failed with error 19.
Trying to mount root from zfs:zroot []...
mountroot: waiting for device zroot ...
Mounting from zfs:zroot failed with error 19.
panic: mountroot: unable to (re-)mount root.
So, it seems that waiting for device when we are booting from zfs
is not necessary..
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WBR, Andrey V. Elsukov