diff --git a/debian/boot.txt b/debian/boot.txt
index 2a2967d..8d6e56d 100644
--- a/debian/boot.txt
+++ b/debian/boot.txt
@@ -49,4 +49,15 @@
 	done
 fi
 
+if printenv m4enabled; then
+	if test ${m4enabled} = 1; then
+		if ext2load mmc ${bootdev}:1 ${fdtovaddr} fsl-imx8mq-phanbell-m4.dtbo && fdt apply ${fdtovaddr}; then
+			echo M4 overlay loaded, starting core
+			run m4boot
+		else
+			echo M4 overlay failed
+		fi
+	fi
+fi
+
 booti ${loadaddr} - ${fdt_addr}