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

Benjamin Lutz mail at
Wed Oct 24 09:06:34 PDT 2007

On 2007-10-24 17:15, Roland Smith wrote:
> 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.

I'm guessing based on its timestamp pointing to the last system boot,
when the USB adapter wasn't connected, based on the device persisting
when I unplug the USB adapter.

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