diff --git a/trunk/bootrom/build/libraries/os/common/os_alarm.c b/trunk/bootrom/build/libraries/os/common/os_alarm.c
index 6dbaa05..2fc7378 100644
--- a/trunk/bootrom/build/libraries/os/common/os_alarm.c
+++ b/trunk/bootrom/build/libraries/os/common/os_alarm.c
@@ -82,7 +82,7 @@ static void i_osSetTimer(OSAlarm *alarm)
 //    osEnterTimerCallback(OSi_ALARM_TIMER, i_osAlarmHandler, NULL);
 
     //---- set count and let timer be enable
-    if (delta < 0)
+    if (delta <= 0)
     {
 #ifdef SDK_ARM11
         timerCount = 1;
@@ -178,11 +178,9 @@ void osEndAlarm(void)
         SDK_ASSERTMSG(!i_osAlarmQueue.head,
                       "osEndAlarm: Cannot end alarm system while using alarm.");
 
-#ifdef SDK_ARM9
         //---- unset timer reservation by OS
         SDK_ASSERT(i_osIsTimerReserved(OSi_ALARM_TIMER));
         i_osUnsetTimerReserved(OSi_ALARM_TIMER);
-#endif // SDK_ARM9
 
         i_osUseAlarm = FALSE;
     }