I have build myself a APRX Igate on a WL500gP V1, using openwrt Backfire 10.03, have set it up as a client (i use the 2.4 kernel and NAS) and made it to work with a Prolific Technology, Inc. PL2303 Serial Port  (USB to Serial converter)
However, I happen to own a couple of QinHeng Electronics HL-340 USB-Serial adapter adapters and do not know which driver to use. dmesg tells me:
usb.c: USB device 2 (vend/prod 0x1a86/0x7523) is not claimed by any active drive                                                                                                                               r.

Is there anyone who can help me out ?

Erik

The QinHeng Electronics HL-340 (ex. Orient USS-102) is a CH 340 compatible device.
Try:

opkg install kmod-usb-serial-ch341

As result:

[   20.000000] usbcore: registered new interface driver ch341
[   20.000000] usbserial: USB Serial support registered for ch341-uart
[   20.010000] ch341 1-1.2:1.0: ch341-uart converter detected
[   20.040000] usb 1-1.2: ch341-uart converter now attached to ttyUSB0

(Last edited by Dirry on 31 Jan 2016, 15:01)

Thanks. I had solved the issue in the meantime, but nevertheless.