Another question regarding the bluetooth. It seems we are compiling the bluetooth as module in kernel (CONFIG_BT=m) just like the wifi.
But I didn't find any place where the driver is loaded.
For wifi, we added 'bcmdhd' into 'droid-hal-hammerhead.conf' in '/usr/lib/modules-load.d/'

Isn't a similar solution necessary for the bluetooth? Or that just works?