diff --git a/components/drivers/rtc/dev_alarm.c b/components/drivers/rtc/dev_alarm.c
index e17f34462c..ae619bf59a 100644
--- a/components/drivers/rtc/dev_alarm.c
+++ b/components/drivers/rtc/dev_alarm.c
@@ -52,7 +52,11 @@ static rt_err_t alarm_set(struct rt_alarm *alarm)
     struct rt_rtc_wkalarm wkalarm;
     rt_err_t ret;
 
+#ifdef RT_USING_SOFT_RTC
+    device = rt_device_find("sw_rtc");
+#else
     device = rt_device_find("rtc");
+#endif
 
     if (device == RT_NULL)
     {
diff --git a/components/drivers/rtc/dev_soft_rtc.c b/components/drivers/rtc/dev_soft_rtc.c
index 0eab72ebe5..dcd4721409 100644
--- a/components/drivers/rtc/dev_soft_rtc.c
+++ b/components/drivers/rtc/dev_soft_rtc.c
@@ -226,8 +226,8 @@ static int rt_soft_rtc_init(void)
     {
         return 0;
     }
-    /* make sure only one 'rtc' device */
-    RT_ASSERT(!rt_device_find("rtc"));
+    /* make sure only one 'sw_rtc' device */
+    RT_ASSERT(!rt_device_find("sw_rtc"));
 
 #ifdef RT_USING_ALARM
     rt_timer_init(&alarm_time,
@@ -258,7 +258,9 @@ static int rt_soft_rtc_init(void)
     /* no private */
     soft_rtc_dev.user_data = RT_NULL;
 
-    rt_device_register(&soft_rtc_dev, "rtc", RT_DEVICE_FLAG_RDWR);
+    rt_device_register(&soft_rtc_dev, "sw_rtc", RT_DEVICE_FLAG_RDWR);
+
+    source_device = &soft_rtc_dev;
 
     init_ok = RT_TRUE;
 
@@ -317,7 +319,7 @@ static void cmd_rtc_sync(int argc, char **argv)
     rt_kprintf("local time: %.*s", 25, ctime(&now));
     rt_kprintf("timestamps: %ld\n", (long)tv.tv_sec);
 }
-MSH_CMD_EXPORT_ALIAS(cmd_rtc_sync, rtc_sync, Update time by real rtc);
+MSH_CMD_EXPORT_ALIAS(cmd_rtc_sync, rtc_sync, Update time by soft rtc);
 #endif
 
 #endif /* RT_USING_SYSTEM_WORKQUEUE */
diff --git a/libcpu/arm/cortex-r52/start_gcc.S b/libcpu/arm/cortex-r52/start_gcc.S
index 787d3e44fb..73d70a63b9 100644
--- a/libcpu/arm/cortex-r52/start_gcc.S
+++ b/libcpu/arm/cortex-r52/start_gcc.S
@@ -12,8 +12,6 @@
 @ (c) Texas Instruments 2009-2013, All rights reserved.
 @
 
-//#include <rtconfig.h>
-
 .equ Mode_USR,        0x10
 .equ Mode_FIQ,        0x11
 .equ Mode_IRQ,        0x12
@@ -47,7 +45,7 @@ stack_top:
     .text
     .arm
 
-    .globl _c_int00
+    .globl entry
 
 .globl _reset
 _reset:
@@ -122,7 +120,7 @@ next2:
 next3:
         bl    next4
 next4:
-        ldr  lr, =_c_int00
+        ldr  lr, =entry
         bx   lr
 
 .globl data_init
@@ -479,26 +477,38 @@ turnon_VFP:
         str     lr, [r0, #14*4]         @/* Save calling PC                 */
     .endm
 
-    .globl  vector_svc
-vector_svc:
-        push_svc_reg
-        bl      rt_hw_trap_svc
-        b       .
+.globl SWI_Handler
+SWI_Handler:
+    push_svc_reg
+    bl      rt_hw_trap_swi
+    b       .
 
-    .globl  vector_pabort
-vector_pabort:
-        push_svc_reg
-        bl      rt_hw_trap_pabt
-        b       .
+.globl Undefined_Handler
+Undefined_Handler:
+    push_svc_reg
+	bl	rt_hw_trap_undef
+    b   .
 
-    .globl  vector_dabort
-vector_dabort:
-        push_svc_reg
-        bl      rt_hw_trap_dabt
-        b       .
+.globl SVC_Handler
+SVC_Handler:
+	push_svc_reg
+	b	rt_hw_trap_svc
+    b   .
 
-    .globl  vector_resv
-vector_resv:
-        push_svc_reg
-        bl      rt_hw_trap_resv
-        b       .
+.globl Prefetch_Handler
+Prefetch_Handler:
+    push_svc_reg
+	b	rt_hw_trap_pabt
+    b   .
+
+.globl Abort_Handler
+Abort_Handler:
+    push_svc_reg
+	b	rt_hw_trap_dabt
+    b   .
+
+.globl Reserved_Handler
+Reserved_Handler:
+    push_svc_reg
+	b	rt_hw_trap_resv
+    b   .
diff --git a/libcpu/arm/cortex-r52/start_iar.S b/libcpu/arm/cortex-r52/start_iar.S
index 9e110dd152..ec096d5c01 100644
--- a/libcpu/arm/cortex-r52/start_iar.S
+++ b/libcpu/arm/cortex-r52/start_iar.S
@@ -31,11 +31,13 @@ ABT_Stack_Size  EQU     0x00000000
 FIQ_Stack_Size  EQU     0x00001000  
 IRQ_Stack_Size  EQU     0x00001000
         
-    IMPORT _c_int00
+    IMPORT entry
     IMPORT rt_hw_trap_svc
     IMPORT rt_hw_trap_pabt
     IMPORT rt_hw_trap_dabt
     IMPORT rt_hw_trap_resv
+    IMPORT rt_hw_trap_swi
+    IMPORT rt_hw_trap_undef
     IMPORT system_init
     IMPORT __iar_program_start
   
@@ -308,6 +310,18 @@ turnon_VFP:
         str     lr, [r0, #14*4]         ;@/* Save calling PC                 */
     endm
 
+    EXPORT  SWI_Handler
+SWI_Handler:
+        push_svc_reg
+        bl      rt_hw_trap_swi
+        b       .
+
+    EXPORT  Undefined_Handler
+Undefined_Handler:
+        push_svc_reg
+        bl      rt_hw_trap_undef
+        b       .
+
     EXPORT  SVC_Handler
 SVC_Handler:
         push_svc_reg
diff --git a/libcpu/arm/cortex-r52/vector_gcc.S b/libcpu/arm/cortex-r52/vector_gcc.S
index a0421d535e..85686ede06 100644
--- a/libcpu/arm/cortex-r52/vector_gcc.S
+++ b/libcpu/arm/cortex-r52/vector_gcc.S
@@ -19,7 +19,8 @@
 @ import reference for interrupt routines
 
     .globl Reset_Handler
-    .globl turnon_VFP
+    .globl Undefined_Handler
+    .globl SWI_Handler
     .globl SVC_Handler
     .globl Prefetch_Handler
     .globl Abort_Handler
@@ -28,10 +29,11 @@
     .globl FIQ_Handler
 
 
-.globl system_vectors
-system_vectors:
+.globl system_vector
+system_vector:
         b   Reset_Handler
-        b   turnon_VFP
+        b   Undefined_Handler
+        b   SWI_Handler
         b   SVC_Handler
         b   Prefetch_Handler
         b   Abort_Handler
diff --git a/libcpu/arm/cortex-r52/vector_iar.S b/libcpu/arm/cortex-r52/vector_iar.S
index 916e44d6a5..57de4e8f83 100644
--- a/libcpu/arm/cortex-r52/vector_iar.S
+++ b/libcpu/arm/cortex-r52/vector_iar.S
@@ -20,6 +20,7 @@
 
     IMPORT Reset_Handler
     IMPORT Undefined_Handler
+    IMPORT SWI_Handler
     IMPORT SVC_Handler
     IMPORT Prefetch_Handler
     IMPORT Abort_Handler
@@ -35,6 +36,7 @@
 system_vectors:
         b   Reset_Handler
         b   Undefined_Handler
+        b   SWI_Handler
         b   SVC_Handler
         b   Prefetch_Handler
         b   Abort_Handler