aarch64-poky-linux-gcc -E --sysroot=/path/to/sysroot  -nostdinc -I include -I arch  -undef -x assembler-with-cpp \
        arch/arm64/boot/dts/rockchip/rk3399-product.dts | \
    dtc -O dtb -o Image.dtb
rm -f Image.gz
gzip > Image.gz < ./arch/arm64/boot/Image
uboot-mkimage -f image.its image.fit