> Hmm...  I do have it working now by not using the flag0 mediaopt at all.
> If I configure the two cards with
> 
> machA# ifconfig awi0 nwid 1 10.0.0.1 netmask 0xffffff00 mediaopt adhoc
> machB# ifconfig awi0 nwid 1 10.0.0.2 netmask 0xffffff00 mediaopt adhoc
> 
> it works fine (when I have working cards--4 in the box of 10 appeared
> to be inoperable--3 would not pass self-test, and 1 would pass the
> self-test, but would not work).

Well, I'm not sure why it works without IBSS creator...
It must work if there is at least one IBSS creator, such as Windows Box.

> I am somewhat interested in building a BSD-based base station, though
> I know very little about it at this point.  Do you know what would be
> required and if/where documentation is available?

That's also my long term TODO...

http://www.amd.com/products/npd/software/pcnet_mobile/utilities/utilities.html
is helpful. and of course, IEEE 802.11 base spec, which is not free.

Atsushi Onoe