diff --git a/components/esp_hw_support/sleep_modes.c b/components/esp_hw_support/sleep_modes.c
index 397811c4a4..d4078b2aa3 100644
--- a/components/esp_hw_support/sleep_modes.c
+++ b/components/esp_hw_support/sleep_modes.c
@@ -1476,7 +1476,13 @@ static uint32_t get_power_down_flags(void)
     return pd_flags;
 }
 
-void esp_deep_sleep_disable_rom_logging(void)
+#if CONFIG_IDF_TARGET_ESP32
+/* APP core of esp32 can't access to RTC FAST MEMORY, do not define it with RTC_IRAM_ATTR */
+void
+#else
+void RTC_IRAM_ATTR
+#endif
+esp_deep_sleep_disable_rom_logging(void)
 {
     rtc_suppress_rom_log();
 }
diff --git a/examples/system/deep_sleep_wake_stub/main/rtc_wake_stub_example.c b/examples/system/deep_sleep_wake_stub/main/rtc_wake_stub_example.c
index 628af418c1..b174562366 100644
--- a/examples/system/deep_sleep_wake_stub/main/rtc_wake_stub_example.c
+++ b/examples/system/deep_sleep_wake_stub/main/rtc_wake_stub_example.c
@@ -33,6 +33,9 @@ static const uint32_t s_max_count = 20;
 // wakeup_cause stored in RTC memory
 static uint32_t wakeup_cause;
 
+// wakeup_time from CPU start to wake stub
+static uint32_t wakeup_time;
+
 // wake up stub function stored in RTC memory
 void wake_stub_example(void)
 {
@@ -41,7 +44,7 @@ void wake_stub_example(void)
     // Increment the counter.
     s_count++;
     // Print the counter value and wakeup cause.
-    ESP_RTC_LOGI("wake stub: wakeup count is %d, wakeup cause is %d", s_count, wakeup_cause);
+    ESP_RTC_LOGI("wake stub: wakeup count is %d, wakeup cause is %d, wakeup cost %ld us", s_count, wakeup_cause, wakeup_time);
 
     if (s_count >= s_max_count) {
         // Reset s_count