diff --git a/qiboot/README b/qiboot/README
index e69de29..ab9cad4 100644
--- a/qiboot/README
+++ b/qiboot/README
@@ -0,0 +1,6 @@
+use follow command to run this program
+start OpenOCD,then do this
+
+  > reset halt
+  > load_image /path/to/led_on 0
+  > resume
diff --git a/qiboot/src/led.S b/qiboot/src/led.S
index 8e539df..04a98ee 100644
--- a/qiboot/src/led.S
+++ b/qiboot/src/led.S
@@ -1,9 +1,17 @@
-.global _start
-_start:	
+.globl _start
+_start:	b       start_code
+
+start_code:	
 	ldr	sp,=1024*4
-	
-.extern main
-	bl	main
+
+	/* turn off the watchdog */
+#  define pWTCON		0x53000000
+	ldr     r0, =pWTCON
+	mov     r1, #0x0
+	str     r1, [r0]
+
+.extern blink_led
+	bl	blink_led
 .global delay
 delay:
 	subs	r0,r0,#0x1
diff --git a/qiboot/src/led.c b/qiboot/src/led.c
index 5e8447b..29a32a2 100644
--- a/qiboot/src/led.c
+++ b/qiboot/src/led.c
@@ -8,7 +8,7 @@
 
 extern void delay(int time);
 
-int main()
+int blink_led()
 {
     GPBCON = 0x5;
     GPBDW = 0xffff;