diff --git a/abstract-machine/am/src/platform/nemu/ioe/timer.c b/abstract-machine/am/src/platform/nemu/ioe/timer.c
index a566162..8a0daa7 100644
--- a/abstract-machine/am/src/platform/nemu/ioe/timer.c
+++ b/abstract-machine/am/src/platform/nemu/ioe/timer.c
@@ -17,11 +17,8 @@ void __am_timer_init() {
 }
 
 void __am_timer_uptime(AM_TIMER_UPTIME_T *uptime) {
-  volatile uint32_t lower_timer = inl(RTC_ADDR);
-  volatile uint32_t high_timer = inl(RTC_ADDR + 4);
-  volatile uint64_t timer = lower_timer + (((uint64_t) high_timer) << 32);
-  (*(volatile AM_TIMER_UPTIME_T *)uptime).us = timer - __timer_start;
-  PNT_BITS(uptime->us);
+  (*(volatile AM_TIMER_UPTIME_T *)uptime).us = GET_TIME() - __timer_start;
+  //PNT_BITS(uptime->us);
 }
 
 void __am_timer_rtc(AM_TIMER_RTC_T *rtc) {
diff --git a/nemu/src/device/io/map.c b/nemu/src/device/io/map.c
index 045d6ac..c3ab777 100644
--- a/nemu/src/device/io/map.c
+++ b/nemu/src/device/io/map.c
@@ -59,7 +59,7 @@ word_t map_read(paddr_t addr, int len, IOMap *map) {
   invoke_callback(map->callback, offset, len, false); // prepare data to read
   word_t ret = host_read(map->space + offset, len);
 //word_t ret = *(word_t*)(map->space + offset);
-printf("map_read: %p, %d\n", map->space + offset, ret);
+//printf("map_read: %p, %d\n", map->space + offset, ret);
   return ret;
 }
 
diff --git a/nemu/src/device/timer.c b/nemu/src/device/timer.c
index 3fe5b1c..7384369 100644
--- a/nemu/src/device/timer.c
+++ b/nemu/src/device/timer.c
@@ -26,7 +26,7 @@ static void rtc_io_handler(uint32_t offset, int len, bool is_write) {
     printf("rtc_io_handle %ld\n", us);
     rtc_port_base[0] = (uint32_t)us;
     rtc_port_base[1] = us >> 32;
-    printf("rtc_port_handle %d, %d [%p]\n", rtc_port_base[0], rtc_port_base[1], rtc_port_base);
+    //printf("rtc_port_handle %d, %d [%p]\n", rtc_port_base[0], rtc_port_base[1], rtc_port_base);
   }
 }