R12A_RFE
rfe[0] = rtwn_bb_read(sc, R12A_RFE(0));
rfe[1] = rtwn_bb_read(sc, R12A_RFE(1));
rtwn_bb_write(sc, R12A_RFE(0), rfe[0]);
rtwn_bb_write(sc, R12A_RFE(1), rfe[1]);