Now the really easy way to avoid this is to have to firmware always loaded into the card, i.e. no need to load any firmware on boot. Also I would guess physically locking the card to the specific frequency band and power-levels allowed by the FCC and similar organizations, would be sufficient, but I am by no means any expert on this, so it's mostly speculations on my part.
No announcement yet.
Broadcom Announces Open-Source 802.11n Driver!