ucom/uftdi dropping bytes, with debug logs

[M. Warner Losh]

In message: <e6vefe$5bq$1 at sea.gmane.org>
            Geoffrey Mainland <mainland at apeiron.net> writes:
: The fact that this runs fine under VMWare makes me strongly suspect a
: timing issue that is fixed by some sort of buffering at the VMWare
: level. Where should I start to look to hack something in to test this?
: The ucom driver seems to be setting up the read transfers that don't
: complete on time.

I'd start looking into ucom.c and uftdi.c.

Warner