From owner-freebsd-usb@FreeBSD.ORG  Wed Nov 25 01:56:11 2009
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From: Trevor Blackwell <tlb@anybots.com>
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Date: Tue, 24 Nov 2009 17:29:25 -0800
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Subject: Identifying serial ports
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I have two USB devices that work as serial ports:

ugen2.2.0: umodem0: <Hokuyo Data Flex for USB URG-Series USB Driver,  
class 2/0, rev 2.00/1.00, addr 2>
ugen2.3.0: uplcom0: <Prolific Technology Inc. USB-Serial Controller,  
class 0/0, rev 1.10/3.00, addr 3>

and they appear as serial devices /dev/cuaU0 and /dev/cuaU1. But I  
can't find a general-purpose way to figure out which is which. It  
depends on which gets enumerated first. In FreeBSD 7, the USB device  
minor # seemed to correspond to the cuaU device number, but here they  
are both zero. Any ideas?

--
Trevor Blackwell        tlb@anybots.com        650 776 7870