build minimal armbian image for phicomm-n1.
git clone https://github.com/armbian/build
cd build
git clone https://github.com/whiler/armbian-n1-userpatch userpatches
git checkout $(awk -F '\"' '/LIB_TAG/ {print $2}' userpatches/config-phicomm-n1.conf)
./compile.sh