diff --git a/driver/board_driver/01-led/led.s b/driver/board_driver/01-led/led.s
index 2d4ed65..1de7c1f 100644
--- a/driver/board_driver/01-led/led.s
+++ b/driver/board_driver/01-led/led.s
@@ -6,5 +6,12 @@ _start:
     ldr sp, =0x40000000
     b main
 
-
+main:
+    ldr r0, =0x40000000
+    ldr r1, =0x00000001
+    str r1, [r0]
+    ldr r0, =0x40000000
+    ldr r1, =0x00000000
+    str r1, [r0]
+    b main
 
diff --git a/driver/board_driver/01-led/makefile b/driver/board_driver/01-led/makefile
index f057761..58ce346 100644
--- a/driver/board_driver/01-led/makefile
+++ b/driver/board_driver/01-led/makefile
@@ -1,6 +1,6 @@
 
 led:led.s
-	arm-linux-gnueabihf-gcc -c  led.s
+	arm-linux-gnueabihf-gcc -c -nostdlib led.s
 	arm-linux-gnueabihf-gcc -o led led.o
 
 clean: