Re: uchcom USB-serial

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

On Sat, Oct 13, 2018 at 12:39:35PM +0200, Manuel Bouyer wrote:
> On Tue, Oct 09, 2018 at 04:13:32PM +0100, Patrick Welche wrote:
> > I purchased a couple of USB-serial adapters. Unfortunately, given the lack
> > of detail in the descriptions, they turned out to be
> > 
> >   uchcom0: QinHeng Electronics (0x1a86) USB2.0-Ser! (0x7523), rev 1.10/2.54
> > 
> > According to
> > 
> >   https://nxr.netbsd.org/xref/src/sys/dev/usb/uchcom.c#40
> > 
> > this is "the worst USB-serial chip in the world."
> > 
> > Do these work at all? (Get "tip: link down", then change to a 
> > uplcom0: Prolific Technology Inc. and all is well.)
> 
> I use one:
> uchcom0: QinHeng Electronics (0x1a86) USB2.0-Serial (0x7523), rev 1.10/2.54, addr 3
> uchcom0: CH341 detected
> ucom0 at uchcom0
> 
> to connect to an ARM board's console. I didn't notice problems so far ...

Just had a proper go, and see:

uchcom0: QinHeng Electronics (0x1a86) USB2.0-Ser! (0x7523), rev 1.10/2.54, addr 3
uchcom0: CH341 detected
ucom3 at uchcom0
uchcom0: cannot reset: STALLED
uchcom0: cannot reset: STALLED
uchcom0: cannot reset: STALLED
uchcom0: cannot reset: STALLED
uchcom0: cannot reset: STALLED
uchcom0: cannot reset: STALLED
uchcom0: cannot reset: STALLED
...

I note that you have the full word "Serial"...

Cheers,

Patrick