$ cd PATH_YOUR_PROJECT
$ cd kernel
$ make ARCH=arm64 kedge_defconfig -jN
$ make ARCH=arm64 rk3399-khadas-edge-android.img -jN
$ source build/envsetup.sh
$ lunch rk3399_all-userdebug
$ ./mkimage.sh
$ ./pack_image.sh
$ ./mkimage.sh
Has this order been executed? This is very important.