From owner-freebsd-usb@FreeBSD.ORG  Fri Sep  3 17:17:53 2010
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From: Hans Petter Selasky <hselasky@c2i.net>
To: Piet Skiet <tuksgig@gmail.com>
Date: Fri, 3 Sep 2010 19:13:44 +0200
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Cc: freebsd-usb@freebsd.org
Subject: Re: USB synchronous control transfers (for usb-to-serial)
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> 
> Hi,
> 
> Attached is the patch adding a 250ms polling control transfer to
> update the port status flags. I've also added CRTSCTS hardware flow
> control. I did some tests with minicom and with gtkterm. Minicom works
> perfectly, but gtkterm has problems at baud 115200 and also with
> hardware flow control. I also testes the Prolific driver (uplcom) with
> minicom and gtkterm, and gtkterm has the same problems at 115200 baud,
> so I'm assuming it's  a gtkterm bug (not maintained anymore).
> 
> BTW, do the usb-to-serial drivers need the force_short_xfer usb
> transfer flag? gtkterm seems to work slightly better without the
> flag...
> 
> Anyway, thanks for the help so far

You can remove the force_short_xfer usb transfer flag, if you can verify that 
the chip receive data if you send a USB packet of exactly 64 or 512 bytes, 
depending on USB full or high-speed.

--HPS