Brian Buhrow's hunch about sysctl variables being the cause of 3ware's
FreeBSD cli not working on NetBSD is spot on.  It uses sysctlbyname()
to look-up the following:

kern.osreldate
hw.twe0.driver_version
	...

The reason it does not work is that FreeBSD has undocumented OIDs in
their mib, 0.x.  eg: mib 0.3 converts a mib name to an oid value.  This
is used by sysctlbyname in the same manner that NetBSD's uses
sysctlgetmibinfo.

How should this be dealt with?  handle oid 0.x in sys___sysctl?  a shim
before sys___sysctl?

Is the latter possible?  So that the existing oid resolver code in libc
can be used, and not moved to the kernel.