diff --git a/bsp/cvitek/c906_little/board/board.h b/bsp/cvitek/c906_little/board/board.h
index bf8863e84b9..bc55f9bcf0b 100755
--- a/bsp/cvitek/c906_little/board/board.h
+++ b/bsp/cvitek/c906_little/board/board.h
@@ -11,6 +11,8 @@
 #define __BOARD_H__
 
 #include <rtconfig.h>
+#include "tick.h"
+#include "drv_uart.h"
 
 extern rt_uint8_t HeapBase;
 extern rt_uint8_t HeapLimit;
diff --git a/libcpu/risc-v/common/trap_common.c b/libcpu/risc-v/common/trap_common.c
index 6f7352cd569..0dbd7f2c75c 100644
--- a/libcpu/risc-v/common/trap_common.c
+++ b/libcpu/risc-v/common/trap_common.c
@@ -47,7 +47,6 @@ rt_weak rt_isr_handler_t rt_hw_interrupt_install(int vector, rt_isr_handler_t ha
         void *param, const char *name)
 {
     rt_isr_handler_t old_handler = RT_NULL;
-    void *user_param = param;
 
     if(vector < ISR_NUMBER)
     {
@@ -74,7 +73,7 @@ rt_weak void rt_rv32_system_irq_handler(rt_uint32_t mcause)
     rt_uint32_t exception = !(mcause & 0x80000000);
     if(exception)
     {
-        s_stack_frame = (rt_hw_stack_frame_t *)mscratch;
+        s_stack_frame = (volatile rt_hw_stack_frame_t *)(uintptr_t)mscratch;
         rt_show_stack_frame();
     }
     else
diff --git a/libcpu/risc-v/rv64/trap.c b/libcpu/risc-v/rv64/trap.c
index 781fbed72aa..f7e29d6d59a 100755
--- a/libcpu/risc-v/rv64/trap.c
+++ b/libcpu/risc-v/rv64/trap.c
@@ -12,6 +12,8 @@
 
 #include <encoding.h>
 
+extern int rt_hw_tick_isr(void);
+extern void rt_hw_irq_isr(void);
 
 struct exception_stack_frame
 {