ucom serial bug?

[Hans Petter Selasky]

On Thursday 04 December 2008, Gabor wrote:
> Some more twists to this.  As I said if I kill off our program and restart
> it, it never sees carrier unless the module was reloaded. However, if I
> unplug the serial cable from the Windows box and re-plug it, carrier goes
> and comes back as expected but only as long as our software is running.  If
> our software is not running and we unplug the serial cable from the Windows
> box, carrier does not come back when we start up our program with the cable
> plugged back in.

Maybe you can try setting the MSR to zero when the modem is opened in the 
uftdi.c driver file.

In USB2 there is also a sysctl for UFTDI debugging which you can check.

--HPS