diff --git a/bsp/at91sam9260/startup.c b/bsp/at91sam9260/startup.c
index 97afe0b124466840cc2bcccd11c1427d0466d958..e23dfa1f5ee4e09b308d7b55800b3c4a4b1af88b 100755
--- a/bsp/at91sam9260/startup.c
+++ b/bsp/at91sam9260/startup.c
@@ -64,13 +64,12 @@ extern void finsh_system_init(void);
  */
 void rtthread_startup(void)
 {
-	rt_uint32_t UNUSED level;
-
 	/* disable interrupt first */
-	level = rt_hw_interrupt_disable();
+	rt_hw_interrupt_disable();
 	/* enable cpu cache */
+	rt_hw_cpu_icache_disable();
+	mmu_invalidate_icache();
 	rt_hw_cpu_icache_enable();
-	rt_hw_cpu_dcache_enable();
 
 	/* initialize hardware interrupt */
 	rt_hw_interrupt_init();