diff --git a/components/drivers/serial/serial.c b/components/drivers/serial/serial.c
index 06d2264e6d..405dbcbf9f 100644
--- a/components/drivers/serial/serial.c
+++ b/components/drivers/serial/serial.c
@@ -1135,7 +1135,7 @@ static rt_err_t rt_serial_control(struct rt_device *dev,
             break;
         case TCFLSH:
             {
-                int queue = (int)args;
+                int queue = (int)(rt_ubase_t)args;
 
                 _tc_flush(serial, queue);
             }
diff --git a/components/libc/posix/io/termios/termios.c b/components/libc/posix/io/termios/termios.c
index 84061079d9..ece9081d9d 100644
--- a/components/libc/posix/io/termios/termios.c
+++ b/components/libc/posix/io/termios/termios.c
@@ -13,6 +13,7 @@
 #include <unistd.h>
 #include <sys/errno.h>
 #include "termios.h"
+#include <rtthread.h>
 
 int tcgetattr(int fd, struct termios *tio)
 {
@@ -95,12 +96,12 @@ int tcsendbreak(int fd, int dur)
 
 int tcflush(int fd, int queue)
 {
-    return ioctl(fd, TCFLSH, (void*)queue);
+    return ioctl(fd, TCFLSH, (void*)(rt_ubase_t)queue);
 }
 
 int tcflow(int fd, int action)
 {
-    return ioctl(fd, TCXONC, (void*)action);
+    return ioctl(fd, TCXONC, (void*)(rt_ubase_t)action);
 }
 
 /**
diff --git a/libcpu/aarch64/common/mmu.c b/libcpu/aarch64/common/mmu.c
index cac70d2767..0197e23f0f 100644
--- a/libcpu/aarch64/common/mmu.c
+++ b/libcpu/aarch64/common/mmu.c
@@ -564,6 +564,7 @@ int rt_hw_mmu_ioremap_init(rt_mmu_info *mmu_info, void *v_address, size_t size)
     return 0;
 }
 
+#ifdef RT_USING_SMART
 static size_t find_vaddr(rt_mmu_info *mmu_info, int pages)
 {
     size_t loop_pages;
@@ -607,7 +608,6 @@ static size_t find_vaddr(rt_mmu_info *mmu_info, int pages)
     return 0;
 }
 
-#ifdef RT_USING_SMART
 static int check_vaddr(rt_mmu_info *mmu_info, void *va, int pages)
 {
     size_t loop_va;