Greg,

It turns out "pilot-induced-turbulence" was the cause of the second
device not working.  It's now working.  It seems the Belkin F5U109
will work for us in 2.4.18-3.  I'll make sure the "powers-that-be"
undertand the kernel we are using needs updating.

Regards,
Joel Breazeale


> On Tue, Sep 23, 2003 at 04:17:55PM -0500, Joel L. Breazeale wrote:
> > Greg,
> > 
> > Thank you for your reply.  It's also reassuring to know a bug was actually
> > found and *fixed*!  8-)
> > 
> > I have some news.  I tried a Belkin F5U109 and it worked, at least for the
> > one device I was trying to get working.  I did not experience a dropped 
> > character after 20 trials.  Here what I'm seeing in /var/log/messages for
> > your information:
> 
> Nice, looks good.
> 
> > I have a follow-up I hope you can comment upon.  Now that it seems the first
> > device works and doesn't drop characters, I have one other device that I'd
> > like to see if I can get working (but it's not crucial) with the same adapter.
> > I'm forced to use the adapter as the target laptop only has one serial port.
> > The second device works fine with /dev/ttyS0.  Should the code that works with
> > the serial port be able to work unchanged with /dev/ttyUSB0?  My guess is that
> > it should.  The current code sets line speed (B19200) and mode (CS7 | CLOCAL |
> > CREAD | PARENB), all that serial stuff you would expect; may I presume the com-
> > bination of serial-to-USB adapter and driver should cause the adapter to be re-
> > configured to use the correct serial settings?
> 
> Yes, it should all "just work".  Just point your program to
> /dev/ttyUSB0.
> 
> > If all of this is true then it's curious that this just doesn't work.
> > Perhaps I've found a problem.  I would be glad to pursue it if it
> > would ultimately help to shore up a bug.  If you can give me any
> > pointers on proceeding on debugging this situation I would be glad to
> > try.  It might be useful to know the devide in question only trans-
> > mits data.
> 
> What is not working?  Some usb-serial drivers do not handle all of the
> different serial ioctls (don't know about this driver, as I didn't write
> it.)  For example, the "setserial" program will not work on most
> usb-serial drivers (the io_edgeport and io_ti drivers being the
> exception).
> 
> thanks,
> 
> greg k-h
> 



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