LOWER_20_ENABLE
bcn_frm->bbp_info = cpu_to_le16(LOWER_20_ENABLE);
bcn_frm->bbp_info |= cpu_to_le16(LOWER_20_ENABLE >> 12);
cpu_to_le16(LOWER_20_ENABLE |
(LOWER_20_ENABLE >> 12));
cpu_to_le16(LOWER_20_ENABLE);