FreeBSD uses the unified wlan(4) driver, you may need /boot/loader.conf
if_rum_load="YES" wlan_scan_ap_load="YES" wlan_scan_sta_load="YES" wlan_wep_load="YES" wlan_ccmp_load="YES" wlan_tkip_load="YES"
/etc/start_if.rum0 (start_if.ifN):
wlans_rum0="wlan0" create_args_wlan0="wlandev rum0 wlanmode hostap" ifconfig_wlan0="inet 10.50.90.1 netmask 255.255.255.0 ssid unwiredbsd wepmode on wepkey 0x1deadbeef9 mode 11g"