Is an HP P812 (ciss(4) RAID) usable for ZFS?

[Mel Pilgrim]

[Posting this here as this list gets seen by many ZFS-aware eyeballs, 
but if there is a better list please tell me.]

I've gotten my hands on a couple of HP Smart Array P812 RAID 
controllers, but I can't tell if they'll work for ZFS.

I know they're supported by ciss(4), but queries have gotten me 
conflicting answers about HBA/JBOD capability, including that HBA mode 
might be OS-dependent. These do support creating single-disk RAID0 
plexes, but I'd rather not have RAID logic in the path at all if I can 
avoid it.

Does anyone know if these will work as HBAs for ZFS on FreeBSD? If not, 
has anyone used the stated workaround and gotten good results?