On Fri, Dec 23, 2022 at 03:50:26PM +0100, Greg KH wrote:
> On Tue, Dec 20, 2022 at 01:08:59PM +0000, dima.pasechnik@cs.ox.ac.uk wrote:
> > On Mon, Dec 19, 2022 at 06:36:47PM -0500, Alan Stern wrote:
> > > 
> > > It might help if you post the output of "lsusb -v" for this device.
> > Please see attached; I also attached the output for an older version of
> > this board (V1). The one we talk about is V2. Both versions have the
> > same VID, and, weirdly, the same PID (internally they aren't binary
> > compatible, even)
> 
> That's horrible, someone should talk to the vendor here and get them to
> at least bump the device id.

The vendor is ARM (https://www.arm.com/) - I guess Linux Foundation is a good "someone"
to talk to the vendor in this case.

Can PID be bumped up by a firmware update?


> 
> Anyway, I don't see a "serial" device here, just use the cdc-acm driver
> and all should be ok, right?  Is there any missing functionality that
> you feel is required that only the usb-serial api can provide?
Not at this point, no. Perhaps I'll resurrect this if I find something
out.

Best,
Dmitrii