USB-serial device fails to show up in /dev

["Dr. Nicola Mingotti" <nmingotti%gmail.com@localhost>]

Hi all,

I am connecting a usb-serial dongle to a RPI3b+ with NetBSD-10.0,
actually i tried with 3 dongles and the result is similar:

When i connect the device i see this in dmesg:
---- this is a USB -- RS-485 adaptor ---
[   794.003535] uftdi0 at uhub1 port 4 configuration 1 interface 0
[   794.003535] uftdi0: FTDI (0x0403) FT232R USB UART (0x6001), rev 
2.00/6.00, addr 4
[   794.013536] ucom0 at uftdi0 portno 0
----

Now i would expect to see a /dev/ucomX appearing, but i don't see it.

Unplug the device, try with another
---- this is a usb-serial -----
[   982.132525] uslsa0 at uhub1 port 4 configuration 1 interface 0
[   982.142526] uslsa0: Silicon Labs (0x10c4) CP2102N USB to UART Bridge 
Controller (0xea60), rev 2.00/1.00, addr 4
[   982.152528] ucom0 at uslsa0: Silicon Labs CP210x
-------------------------------

Still, i don't see /dev/ucomX in /dev

Probably i am missing something, any advice ?

bye
Nicola