rc.d/zpool runs before ada(4) attaches

[Harry Schmalzbauer]

Hello,  I'm playing with HEAD (post r364746, Merge OpenZFS support in to 
HEAD) on some of my non-out-of-box setups.


One machine fails importing zpool because the correponding vdevs (ada0-ada2)
are not available at the time rc.d/zpool runs.


Adhoc  I'm not aware of any rc(8) vs. driver awareness.
Is there any?

Suggestions how to fix else than 'sleep 1'?

Thanks,

-harry

P.S.: ahci(4) is compiled into kernel, machine is a HPE U48 (Gen 10 plus 
MicroServer), zfsloader loads root_MFS kernel module