From owner-freebsd-usb@FreeBSD.ORG  Tue Aug 10 15:16:00 2010
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Date: Tue, 10 Aug 2010 15:15:58 +0000
From: Marcin Cieslak <saper@saper.info>
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Cc: freebsd-usb@freebsd.org
Subject: Re: usb/149283: avrdude unable to talk to Arduino board (via uftdi)
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The problem got solved. I got:

hw.usb.ucom.cons_unit=0

Resetting this value to -1 enabled the communication.

The problem was because ucom_get_data() didn't fetch
user-supplied data.

Please close this PR.

--Marcin