Please visit http://code.google.com/p/freebsd-wifi-build/wiki/TpLinkTLWR1043ND .
The ethernet and Wireless MAC requires this in hints to pick up the flash MAC address:
{ hint.arge.0.eeprommac=0x1f01fc00 hint.ath.0.eepromaddr=0x1fff1000 }
(Although why every unit seems to have the same ethernet MAC here is beyond me..)