USB->Serial adapter, how to make /dev/cuad* appear?

Roland Smith rsmith at
Wed Oct 24 08:15:38 PDT 2007

On Wed, Oct 24, 2007 at 09:26:20AM +0200, Benjamin Lutz wrote:
> > Does the onboard serial port work via USB? How odd! On my standard PC,
> > the serial ports are driven by the sio driver, and have /dev/cuad* and
> > /dev/ttyd* devices, noc cuaU. 
> No, that one's a standard serial port, driven by sio as well, and
> creates /dev/cuad0, /dev/cuaU0, maybe some /dev/tty* as well, I don't know.

How do you know that cuaU0 belongs to the sio driver? It should belong
to ucom.

According to the manual, sio(4) devices only create ttyd and cuad devices.

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