set(AR9170_MAC_REG_BCN_ADDR, cmd->bcn_ctrl.bcn_addr);
set(AR9170_MAC_REG_BCN_LENGTH, cmd->bcn_ctrl.bcn_len);
set(AR9170_MAC_REG_BCN_CTRL, AR9170_BCN_CTRL_READY);
set(AR9170_MAC_REG_BCN_ADDR, cmd->bcn_ctrl.bcn_addr);
set(AR9170_MAC_REG_BCN_LENGTH, cmd->bcn_ctrl.bcn_len);
set(AR9170_MAC_REG_BCN_CTRL, AR9170_BCN_CTRL_READY);