There's a chart on wikipedia that lists the available drivers for FreeBSD and if they depend on non-free firmware:
http://en.wikipedia.org/wiki/Compari...rivers#FreeBSD
Just as a note, you might still run into an issue with the AR9227 card.
https://wiki.freebsd.org/dev/ath_hal...ardwareSupport
Quote:
AR9227/AR9287
interrupt read-and-clear bug
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