The USB Serial cable I’m trying to use came from Amazon.  According to their 
description it uses the PL2303 chipset, so ...

Following Michael’s advice I added this line to sys/dev/usb/usbdevs where other 
Prolific devices were defined:

        product PROLIFIC PL2303Y 0x23c3 PL2303 Serial adapter (Null modem)

I regenerated the header files and added these lines to the device table in 
sys/dev/usb/uplcom.c:

        /* Prolific USB to serial null modem cable */
        { USB_VENDOR_PROLIFIC, USB_PRODUCT_PROLIFIC_PL2303Y },

Rebuilt the GENERIC kernel and copied to to / and rebooted my system.  I get 
this result:

[     4.235870] uplcom0 at uhub1 port 1
[     4.235870] uplcom0: Prolific Technology Inc. (0x67b) USB-Serial Controller 
(0x23c3), rev 2.00/3.05, addr 1
[     4.245877] uplcom0: autoconfiguration error: reset failed, NOMEM

Did I miss something that is leading to this error? 

-bob

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