As Marcin Cieslak wrote:

> The problem was that USD driver wasn't sending any data via the USB,
> because of hw.usb.ucom.cons_unit=0 setting in /boot/loader.conf,
> that designated the first serial USB adapter to act as the system
> console.

OK, so it's indeed been a FreeBSD-specific problem...  I didn't guess
that from your first description (but I wouldn't have guess at *that*
at all ;-).

> Reverting this setting to hw.usb.ucom.cons_unit=-1 resolved the
> issue and avrdude works fine.

Glad it's working for you, and thanks for letting us know!
-- 
cheers, J"org               .-.-.   --... ...--   -.. .  DL8DTL

http://www.sax.de/~joerg/                        NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)

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