For compiling my dtbo i used dtc located in /usr/src/linux-headers-4.6.7-sun8i/scripts/dtc , not system one located at /usr/bin/dtc
Version: DTC 1.4.1-g4273dca2
it has -@ param
Seams like NanoPi's microusb don't have direct connection to 5v rail, there is p-mosfet on the way, probably to eliminate short when connecting to PC with nanoPi powered from external source. So otg port can't provide power to external device.