usb interface boards and drivers

[Peter Risdon]

I'm trying to determine the best way to interface a device like a servo
motor controller to a usb bus. Boards such as those produced by FTDI
would be useful but they have no FreeBSD drivers.

http://www.ftdichip.com/FTProducts.htm

If anyone knows of any similar products that do have FreeBSD drivers, or
can suggest resources that document an alternative approach, I'd be very
grateful for a steer.

TIA.

Peter.