diff --git a/libcpu/aarch64/common/cpu.c b/libcpu/aarch64/common/cpu.c
index 962a53a0710765087adee863b094fdefd35e445e..84d3df2e8a6322d8592a58133f37861ae6a7b16f 100644
--- a/libcpu/aarch64/common/cpu.c
+++ b/libcpu/aarch64/common/cpu.c
@@ -76,7 +76,7 @@ void rt_hw_spin_unlock(rt_hw_spinlock_t *lock)
 /*@{*/
 
 /** shutdown CPU */
-void rt_hw_cpu_shutdown()
+RT_WEAK void rt_hw_cpu_shutdown()
 {
     rt_uint32_t level;
     rt_kprintf("shutdown...\n");
diff --git a/libcpu/arc/em/cpuport.c b/libcpu/arc/em/cpuport.c
index 34f538881fcc6c93e1cc0d87047d1453bc4a308c..1a2593644a653e7e711fad91088d774767686792 100644
--- a/libcpu/arc/em/cpuport.c
+++ b/libcpu/arc/em/cpuport.c
@@ -32,7 +32,7 @@ struct init_stack_frame {
 /**
  * shutdown CPU
  */
-void rt_hw_cpu_shutdown(void)
+RT_WEAK void rt_hw_cpu_shutdown(void)
 {
 
 }
diff --git a/libcpu/arm/AT91SAM7S/cpu.c b/libcpu/arm/AT91SAM7S/cpu.c
index 8d28063eb11af6fd6d2130b165bf03886fd395a9..b24ab5644bd05686ba95654d1f93b06cfc287604 100644
--- a/libcpu/arm/AT91SAM7S/cpu.c
+++ b/libcpu/arm/AT91SAM7S/cpu.c
@@ -20,7 +20,7 @@
  * this function will reset CPU
  *
  */
-void rt_hw_cpu_reset()
+RT_WEAK void rt_hw_cpu_reset()
 {
 }
 
@@ -28,7 +28,7 @@ void rt_hw_cpu_reset()
  * this function will shutdown CPU
  *
  */
-void rt_hw_cpu_shutdown()
+RT_WEAK void rt_hw_cpu_shutdown()
 {
 	rt_kprintf("shutdown...\n");
 
diff --git a/libcpu/arm/AT91SAM7X/cpu.c b/libcpu/arm/AT91SAM7X/cpu.c
index 484c19d10a46686cbc2ab32a202d1e4db57036e8..046f7e8ced2b11e6ba41e20d8876533b8ddb0f2a 100644
--- a/libcpu/arm/AT91SAM7X/cpu.c
+++ b/libcpu/arm/AT91SAM7X/cpu.c
@@ -20,7 +20,7 @@
  * this function will reset CPU
  *
  */
-void rt_hw_cpu_reset()
+RT_WEAK void rt_hw_cpu_reset()
 {
 }
 
@@ -28,7 +28,7 @@ void rt_hw_cpu_reset()
  * this function will shutdown CPU
  *
  */
-void rt_hw_cpu_shutdown()
+RT_WEAK void rt_hw_cpu_shutdown()
 {
 	rt_kprintf("shutdown...\n");
 
diff --git a/libcpu/arm/am335x/cpu.c b/libcpu/arm/am335x/cpu.c
index cae865fe50a263bbe0ef0632eeb78e4075eed273..469276466b1ddf22c2933c587d9be303492c90a8 100644
--- a/libcpu/arm/am335x/cpu.c
+++ b/libcpu/arm/am335x/cpu.c
@@ -149,7 +149,7 @@ rt_base_t rt_hw_cpu_dcache_status()
  *  shutdown CPU
  *
  */
-void rt_hw_cpu_shutdown()
+RT_WEAK void rt_hw_cpu_shutdown()
 {
 	rt_uint32_t level;
 	rt_kprintf("shutdown...\n");
diff --git a/libcpu/arm/arm926/cpuport.c b/libcpu/arm/arm926/cpuport.c
index 035e97d543398a27b6d6ca4ba73a4d4955d55185..dc93f42ed6fea5eb09a827148a751ff77f2b397a 100644
--- a/libcpu/arm/arm926/cpuport.c
+++ b/libcpu/arm/arm926/cpuport.c
@@ -146,7 +146,7 @@ rt_base_t rt_hw_cpu_dcache_status()
  * reset cpu by dog's time-out
  *
  */
-void rt_hw_cpu_reset()
+RT_WEAK void rt_hw_cpu_reset()
 {
 
     rt_kprintf("Restarting system...\n");
@@ -161,7 +161,7 @@ void rt_hw_cpu_reset()
  *  shutdown CPU
  *
  */
-void rt_hw_cpu_shutdown()
+RT_WEAK void rt_hw_cpu_shutdown()
 {
     rt_uint32_t level;
     rt_kprintf("shutdown...\n");
diff --git a/libcpu/arm/armv6/cpuport.c b/libcpu/arm/armv6/cpuport.c
index c8e92017223035708de919d8c12ec62de8d8d9b4..f886e7e1648f4d6a6509f9b6927346e8c8025782 100644
--- a/libcpu/arm/armv6/cpuport.c
+++ b/libcpu/arm/armv6/cpuport.c
@@ -147,7 +147,7 @@ rt_base_t rt_hw_cpu_dcache_status()
  * reset cpu by dog's time-out
  *
  */
-void rt_hw_cpu_reset()
+RT_WEAK void rt_hw_cpu_reset()
 {
 	
 	rt_kprintf("Restarting system...\n");
@@ -162,7 +162,7 @@ void rt_hw_cpu_reset()
  *  shutdown CPU
  *
  */
-void rt_hw_cpu_shutdown()
+RT_WEAK void rt_hw_cpu_shutdown()
 {
 	rt_uint32_t level;
 	rt_kprintf("shutdown...\n");
diff --git a/libcpu/arm/cortex-a/cpu.c b/libcpu/arm/cortex-a/cpu.c
index 7c6bf58a4bea14dbaa6c440b7ba7ae5a099c108d..6775b781bc7ae688b5493da54a66b78614b8ce0c 100644
--- a/libcpu/arm/cortex-a/cpu.c
+++ b/libcpu/arm/cortex-a/cpu.c
@@ -74,7 +74,7 @@ void rt_hw_spin_unlock(rt_hw_spinlock_t *lock)
 /*@{*/
 
 /** shutdown CPU */
-void rt_hw_cpu_shutdown()
+RT_WEAK void rt_hw_cpu_shutdown()
 {
     rt_uint32_t level;
     rt_kprintf("shutdown...\n");
diff --git a/libcpu/arm/cortex-m3/cpuport.c b/libcpu/arm/cortex-m3/cpuport.c
index d58782e2c5b925a7d79e8a6d2318264437e31f56..b6c4c9743c94e635071bc9cf94dfbb815bea25b1 100644
--- a/libcpu/arm/cortex-m3/cpuport.c
+++ b/libcpu/arm/cortex-m3/cpuport.c
@@ -344,7 +344,7 @@ void rt_hw_hard_fault_exception(struct exception_info * exception_info)
 /**
  * shutdown CPU
  */
-void rt_hw_cpu_shutdown(void)
+RT_WEAK void rt_hw_cpu_shutdown(void)
 {
     rt_kprintf("shutdown...\n");
 
diff --git a/libcpu/arm/cortex-m33/cpuport.c b/libcpu/arm/cortex-m33/cpuport.c
index a589ba346270e41e132669039ddc0879c2b6dd81..42b5798507a16cb255e52a9ebd7fc059d1158398 100644
--- a/libcpu/arm/cortex-m33/cpuport.c
+++ b/libcpu/arm/cortex-m33/cpuport.c
@@ -431,7 +431,7 @@ void rt_hw_hard_fault_exception(struct exception_info *exception_info)
 /**
  * shutdown CPU
  */
-void rt_hw_cpu_shutdown(void)
+RT_WEAK void rt_hw_cpu_shutdown(void)
 {
     rt_kprintf("shutdown...\n");
 
diff --git a/libcpu/arm/cortex-m4/cpuport.c b/libcpu/arm/cortex-m4/cpuport.c
index dc8a9aab59839f39a6cbdfd112a6955c4a9ad5df..2e4783225952f470e1a2a7f154458f8545ecfb27 100644
--- a/libcpu/arm/cortex-m4/cpuport.c
+++ b/libcpu/arm/cortex-m4/cpuport.c
@@ -428,7 +428,7 @@ void rt_hw_hard_fault_exception(struct exception_info *exception_info)
 /**
  * shutdown CPU
  */
-void rt_hw_cpu_shutdown(void)
+RT_WEAK void rt_hw_cpu_shutdown(void)
 {
     rt_kprintf("shutdown...\n");
 
diff --git a/libcpu/arm/cortex-m7/cpuport.c b/libcpu/arm/cortex-m7/cpuport.c
index e701a523076b700af4956aeff015f3e484742163..aeb9f14ac56aa14bc09fcfe393b56ab0b507c402 100644
--- a/libcpu/arm/cortex-m7/cpuport.c
+++ b/libcpu/arm/cortex-m7/cpuport.c
@@ -428,7 +428,7 @@ void rt_hw_hard_fault_exception(struct exception_info *exception_info)
 /**
  * shutdown CPU
  */
-void rt_hw_cpu_shutdown(void)
+RT_WEAK void rt_hw_cpu_shutdown(void)
 {
     rt_kprintf("shutdown...\n");
 
diff --git a/libcpu/arm/cortex-r4/cpu.c b/libcpu/arm/cortex-r4/cpu.c
index d2e8130e7c3d2192f2140a8728b7c1aff337af5f..23c16e383c57bdbb4b07956a40a897b69cf69366 100644
--- a/libcpu/arm/cortex-r4/cpu.c
+++ b/libcpu/arm/cortex-r4/cpu.c
@@ -20,7 +20,7 @@
  * this function will reset CPU
  *
  */
-void rt_hw_cpu_reset()
+RT_WEAK void rt_hw_cpu_reset()
 {
 }
 
@@ -28,7 +28,7 @@ void rt_hw_cpu_reset()
  * this function will shutdown CPU
  *
  */
-void rt_hw_cpu_shutdown()
+RT_WEAK void rt_hw_cpu_shutdown()
 {
 	rt_kprintf("shutdown...\n");
 
diff --git a/libcpu/arm/dm36x/cpuport.c b/libcpu/arm/dm36x/cpuport.c
index f6e8a200569527be8127f54f92f02fa676494cf9..99edb962606bc38c56e8a59b6e4551eedd4bb206 100644
--- a/libcpu/arm/dm36x/cpuport.c
+++ b/libcpu/arm/dm36x/cpuport.c
@@ -145,7 +145,7 @@ rt_base_t rt_hw_cpu_dcache_status()
  * reset cpu by dog's time-out
  *
  */
-void rt_hw_cpu_reset()
+RT_WEAK void rt_hw_cpu_reset()
 {
 	
 	rt_kprintf("Restarting system...\n");
@@ -160,7 +160,7 @@ void rt_hw_cpu_reset()
  *  shutdown CPU
  *
  */
-void rt_hw_cpu_shutdown()
+RT_WEAK void rt_hw_cpu_shutdown()
 {
 	rt_uint32_t level;
 	rt_kprintf("shutdown...\n");
diff --git a/libcpu/arm/lpc214x/cpuport.c b/libcpu/arm/lpc214x/cpuport.c
index 2543a5e0a9e191fa653216cb29ebfbf9d4cff5ec..54e7e9b0c884cbbe9341e2d2f81c934b95e208cf 100644
--- a/libcpu/arm/lpc214x/cpuport.c
+++ b/libcpu/arm/lpc214x/cpuport.c
@@ -163,7 +163,7 @@ rt_isr_handler_t rt_hw_interrupt_install(int vector, rt_isr_handler_t handler,
  * this function will reset CPU
  *
  */
-void rt_hw_cpu_reset(void)
+RT_WEAK void rt_hw_cpu_reset(void)
 {
 }
 
@@ -171,7 +171,7 @@ void rt_hw_cpu_reset(void)
  * this function will shutdown CPU
  *
  */
-void rt_hw_cpu_shutdown()
+RT_WEAK void rt_hw_cpu_shutdown()
 {
 	rt_kprintf("shutdown...\n");
 
diff --git a/libcpu/arm/lpc24xx/cpu.c b/libcpu/arm/lpc24xx/cpu.c
index f3a61e16a3d23baf9be9f6c386f44526de65aa0a..0453722d1d2bf998aad79143f142eae8f995b669 100644
--- a/libcpu/arm/lpc24xx/cpu.c
+++ b/libcpu/arm/lpc24xx/cpu.c
@@ -20,7 +20,7 @@
  * this function will reset CPU
  *
  */
-void rt_hw_cpu_reset()
+RT_WEAK void rt_hw_cpu_reset()
 {
 }
 
@@ -28,7 +28,7 @@ void rt_hw_cpu_reset()
  * this function will shutdown CPU
  *
  */
-void rt_hw_cpu_shutdown()
+RT_WEAK void rt_hw_cpu_shutdown()
 {
 	rt_kprintf("shutdown...\n");
 
diff --git a/libcpu/arm/realview-a8-vmm/cpu.c b/libcpu/arm/realview-a8-vmm/cpu.c
index 2d7871501160a78edc7f1687d426f08de359a508..dbdb4ac515e6acb73e843f0026d9b5b8722bc4c8 100644
--- a/libcpu/arm/realview-a8-vmm/cpu.c
+++ b/libcpu/arm/realview-a8-vmm/cpu.c
@@ -18,7 +18,7 @@
 /*@{*/
 
 /** shutdown CPU */
-void rt_hw_cpu_shutdown()
+RT_WEAK void rt_hw_cpu_shutdown()
 {
 	rt_uint32_t level;
 	rt_kprintf("shutdown...\n");
diff --git a/libcpu/arm/s3c24x0/cpu.c b/libcpu/arm/s3c24x0/cpu.c
index 4d3bf3c1abcc7a5b21a620331ae1c8772e25d636..2adf526a5c99a520fa63016f00dde636b44cae9e 100644
--- a/libcpu/arm/s3c24x0/cpu.c
+++ b/libcpu/arm/s3c24x0/cpu.c
@@ -148,7 +148,7 @@ rt_base_t rt_hw_cpu_dcache_status()
  * reset cpu by dog's time-out
  *
  */
-void rt_hw_cpu_reset()
+RT_WEAK void rt_hw_cpu_reset()
 {
 	/* Disable all interrupt except the WDT */
 	INTMSK = (~((rt_uint32_t)1 << INTWDT));
@@ -171,7 +171,7 @@ void rt_hw_cpu_reset()
  *  shutdown CPU
  *
  */
-void rt_hw_cpu_shutdown()
+RT_WEAK void rt_hw_cpu_shutdown()
 {
 	rt_uint32_t level;
 	rt_kprintf("shutdown...\n");
diff --git a/libcpu/arm/s3c44b0/cpu.c b/libcpu/arm/s3c44b0/cpu.c
index 03ebefba18a54247cc0741704b9145e5813d4d48..9d60b09688219c4b20e32767c8cbfc66a56f25eb 100644
--- a/libcpu/arm/s3c44b0/cpu.c
+++ b/libcpu/arm/s3c44b0/cpu.c
@@ -100,7 +100,7 @@ rt_base_t rt_hw_cpu_dcache_status()
  * this function will reset CPU
  *
  */
-void rt_hw_cpu_reset()
+RT_WEAK void rt_hw_cpu_reset()
 {
 }
 
@@ -108,7 +108,7 @@ void rt_hw_cpu_reset()
  * this function will shutdown CPU
  *
  */
-void rt_hw_cpu_shutdown()
+RT_WEAK void rt_hw_cpu_shutdown()
 {
 	rt_kprintf("shutdown...\n");
 
diff --git a/libcpu/arm/sep4020/cpu.c b/libcpu/arm/sep4020/cpu.c
index ee4eab626be6e5d363b3c9038908253a44231afb..92ba2cf86ad475586c01970b83e840221f676a1f 100644
--- a/libcpu/arm/sep4020/cpu.c
+++ b/libcpu/arm/sep4020/cpu.c
@@ -152,7 +152,7 @@ rt_base_t rt_hw_cpu_dcache_status()
  * reset cpu by dog's time-out
  *
  */
-void rt_hw_cpu_reset()
+RT_WEAK void rt_hw_cpu_reset()
 {
 
 	/* enable watchdog */
@@ -173,7 +173,7 @@ void rt_hw_cpu_reset()
  *  shutdown CPU
  *
  */
-void rt_hw_cpu_shutdown()
+RT_WEAK void rt_hw_cpu_shutdown()
 {
 	rt_uint32_t UNUSED level;
 	rt_kprintf("shutdown...\n");
diff --git a/libcpu/arm/zynq7000/cpu.c b/libcpu/arm/zynq7000/cpu.c
index 5f3a3e7b0296cfc55c1a9804b964fa53769cc381..f6b7f5d852c81e435217e8c82106e0899d978013 100644
--- a/libcpu/arm/zynq7000/cpu.c
+++ b/libcpu/arm/zynq7000/cpu.c
@@ -16,7 +16,7 @@
  * reset cpu by dog's time-out
  *
  */
-void rt_hw_cpu_reset()
+RT_WEAK void rt_hw_cpu_reset()
 {
     while (1);  /* loop forever and wait for reset to happen */
 
@@ -27,7 +27,7 @@ void rt_hw_cpu_reset()
  *  shutdown CPU
  *
  */
-void rt_hw_cpu_shutdown()
+RT_WEAK void rt_hw_cpu_shutdown()
 {
     rt_uint32_t level;
     rt_kprintf("shutdown...\n");
diff --git a/libcpu/avr32/uc3/cpu.c b/libcpu/avr32/uc3/cpu.c
index b77e78dc5ba2cf94c4bb22862f0d06e7e589276b..fdd8a4d56c76a27e4530ebd8945f7475c53143bb 100644
--- a/libcpu/avr32/uc3/cpu.c
+++ b/libcpu/avr32/uc3/cpu.c
@@ -23,7 +23,7 @@
  * reset cpu by dog's time-out
  *
  */
-void rt_hw_cpu_reset()
+RT_WEAK void rt_hw_cpu_reset()
 {
 	/*NOTREACHED*/
 }
diff --git a/libcpu/mips/gs232/cpuport.c b/libcpu/mips/gs232/cpuport.c
index 1b137194492067b10d645bdb74d7fc17a2f02b81..e3c078241f02fb5f53ead27b0a69dc29e9e9141d 100644
--- a/libcpu/mips/gs232/cpuport.c
+++ b/libcpu/mips/gs232/cpuport.c
@@ -23,7 +23,7 @@
  * this function will reset CPU
  *
  */
-void rt_hw_cpu_reset(void)
+RT_WEAK void rt_hw_cpu_reset(void)
 {
     /* open the watch-dog */
     WDT_EN = 0x01; 		/* watch dog enable */
@@ -38,7 +38,7 @@ void rt_hw_cpu_reset(void)
  * this function will shutdown CPU
  *
  */
-void rt_hw_cpu_shutdown(void)
+RT_WEAK void rt_hw_cpu_shutdown(void)
 {
     rt_kprintf("shutdown...\n");
 
diff --git a/libcpu/risc-v/common/cpuport.c b/libcpu/risc-v/common/cpuport.c
index a44dc40f7971d90688bfbd60fa877896c1bb4868..5da3e85645267b4ec6302c9f593b73016d27127a 100644
--- a/libcpu/risc-v/common/cpuport.c
+++ b/libcpu/risc-v/common/cpuport.c
@@ -116,7 +116,7 @@ void rt_hw_context_switch_interrupt(rt_ubase_t from, rt_ubase_t to)
 #endif /* end of RT_USING_SMP */
 
 /** shutdown CPU */
-void rt_hw_cpu_shutdown()
+RT_WEAK void rt_hw_cpu_shutdown()
 {
     rt_uint32_t level;
     rt_kprintf("shutdown...\n");
diff --git a/libcpu/risc-v/nuclei/cpuport.c b/libcpu/risc-v/nuclei/cpuport.c
index e456438f70e9e1b6db2c76f07ded4bd3a3d2d41c..717e9bb1c755c15551c810f59703413062f0ea7c 100644
--- a/libcpu/risc-v/nuclei/cpuport.c
+++ b/libcpu/risc-v/nuclei/cpuport.c
@@ -152,7 +152,7 @@ void rt_hw_context_switch(rt_ubase_t from, rt_ubase_t to)
  * @brief shutdown CPU
  * 
  */
-void rt_hw_cpu_shutdown()
+RT_WEAK void rt_hw_cpu_shutdown()
 {
     rt_uint32_t level;
     rt_kprintf("shutdown...\n");
diff --git a/libcpu/risc-v/t-head/e906/cpuport.c b/libcpu/risc-v/t-head/e906/cpuport.c
index 5597aa237a13979378b08681325218fe85c5cb82..998bfdc3401bb5fb41e797b7bb5b2f75ceb11da6 100644
--- a/libcpu/risc-v/t-head/e906/cpuport.c
+++ b/libcpu/risc-v/t-head/e906/cpuport.c
@@ -157,7 +157,7 @@ void rt_hw_interrupt_enable(rt_base_t level)
 }
 
 /** shutdown CPU */
-void rt_hw_cpu_shutdown()
+RT_WEAK void rt_hw_cpu_shutdown()
 {
     rt_uint32_t level;
     rt_kprintf("shutdown...\n");
diff --git a/libcpu/rx/cpuport.c b/libcpu/rx/cpuport.c
index 681c0e8e6ec49fbbb619ccee31d89be29d09eb58..a01f598e994fa4846e1bc7042a3ab056655e0aa8 100644
--- a/libcpu/rx/cpuport.c
+++ b/libcpu/rx/cpuport.c
@@ -182,7 +182,7 @@ void rt_hw_context_switch_interrupt(rt_uint32_t from, rt_uint32_t to)
  * 
  * @author LXZ (2014/11/8)
  */
-void rt_hw_cpu_shutdown(void)
+RT_WEAK void rt_hw_cpu_shutdown(void)
 {
     rt_kprintf("shutdown...\n");
 
diff --git a/libcpu/ti-dsp/c28x/cpuport.c b/libcpu/ti-dsp/c28x/cpuport.c
index 3f88606c65ae92191d88ba2ebf2a3187b24dc65e..0c7dce2a4e78973f1f3bd554557cd1fd7aeb887d 100644
--- a/libcpu/ti-dsp/c28x/cpuport.c
+++ b/libcpu/ti-dsp/c28x/cpuport.c
@@ -121,7 +121,7 @@ int __rt_ffs(int value)
 /**
  * shutdown CPU
  */
-void rt_hw_cpu_shutdown(void)
+RT_WEAK void rt_hw_cpu_shutdown(void)
 {
     rt_kprintf("shutdown...\n");
 
diff --git a/libcpu/unicore32/sep6200/cpu.c b/libcpu/unicore32/sep6200/cpu.c
index ebea8750e1ba46da455f1e4b55ca152301901fb9..9452b4e59db90b9071666f2a51f75ff6b60e2891 100644
--- a/libcpu/unicore32/sep6200/cpu.c
+++ b/libcpu/unicore32/sep6200/cpu.c
@@ -259,7 +259,7 @@ static void sep6200_poweroff(void)
  * reset cpu by dog's time-out
  *
  */
-void rt_hw_cpu_reset()
+RT_WEAK void rt_hw_cpu_reset()
 {
 
 	rt_kprintf("Soft reset, Restarting system...\n");
@@ -274,7 +274,7 @@ void rt_hw_cpu_reset()
  *  shutdown CPU
  *
  */
-void rt_hw_cpu_shutdown()
+RT_WEAK void rt_hw_cpu_shutdown()
 {
 	rt_uint32_t level;
 	rt_kprintf("shutdown...\n");
diff --git a/libcpu/xilinx/microblaze/cpu.c b/libcpu/xilinx/microblaze/cpu.c
index 50a0e34dcdba684a07749aa44eeef8a0bd76572f..d37dcda350a6545150576075a428ee2fd7f06169 100755
--- a/libcpu/xilinx/microblaze/cpu.c
+++ b/libcpu/xilinx/microblaze/cpu.c
@@ -18,7 +18,7 @@
  * this function will reset CPU
  *
  */
-void rt_hw_cpu_reset()
+RT_WEAK void rt_hw_cpu_reset()
 {
 }
 
@@ -26,7 +26,7 @@ void rt_hw_cpu_reset()
  * this function will shutdown CPU
  *
  */
-void rt_hw_cpu_shutdown()
+RT_WEAK void rt_hw_cpu_shutdown()
 {
 	rt_kprintf("shutdown...\n");