add flag for device tree overlays

04_build_linux.sh

@@ -161,8 +161,8 @@ else
 	make -j${CORES} ARCH=riscv CROSS_COMPILE=${CC} olddefconfig
 fi
 
-echo "make -j${CORES} ARCH=riscv CROSS_COMPILE=${CC} Image modules dtbs"
-make -j${CORES} ARCH=riscv CROSS_COMPILE="ccache ${CC}" Image modules dtbs
+echo "make -j${CORES} ARCH=riscv CROSS_COMPILE=${CC} DTC_FLAGS=\"-@\" Image modules dtbs"
+make -j${CORES} ARCH=riscv CROSS_COMPILE="ccache ${CC}" DTC_FLAGS="-@" Image modules dtbs
 
 if [ ! -f ./arch/riscv/boot/Image ] ; then
 	echo "Build Failed"