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Problems with uplcom/ucom

I just bought an usb-serial converter from Hama. If I plug it into my
NetBSD 4.0/i386 the device is recognized by the kernel:

Jan 28 13:51:14 hobbes /netbsd: uplcom0 at uhub0 port 2
Jan 28 13:51:14 hobbes /netbsd: 
Jan 28 13:51:14 hobbes /netbsd: uplcom0: Prolific Technology Inc.
USB-Serial Controller D, rev 1.10/4.00, addr 3
Jan 28 13:51:14 hobbes /netbsd: ucom0 at uplcom0

However, when I try to use it I just can't send any data (a gps device).
I hate it to say, it works flawlessly with Win, so the adapter itself is

usbdevs -v shows:

usbdevs -v:
port 2 addr 3: full speed, power 100 mA, config 1, USB-Serial Controller
D(0x2303), Prolific Technology Inc.(0x067b), rev 4.00

There seem to be some issues with the different revisions of the device.
I found some posts with 2.02 - 3.0 and 4.0 - however as my knowledge in
this field is quite limited, I am looking for help.

Linux has some fixes
( for the
driver to deal with the different revisions.

Could someone give me hint what to fix in order to this one working?


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