Efpophis/system_bluetooth — pull request #1 by Efpophis (2012-03-22 16:21:14+00:00)
Title: Allow fetching bluetooth MAC address from (in order of precedence):

/efs/imei/bt.txt
/data/misc/bluetoothd/address
property "ril.bt_macaddr"
path specified by property "ro.bt.bdaddr_path"

First of the above that is found sets the BT mac address.