diff --git a/trunk/bootrom/build/libraries/os/ARM11/os_irqHandler.c b/trunk/bootrom/build/libraries/os/ARM11/os_irqHandler.c
index 4ebfa21..caed100 100644
--- a/trunk/bootrom/build/libraries/os/ARM11/os_irqHandler.c
+++ b/trunk/bootrom/build/libraries/os/ARM11/os_irqHandler.c
@@ -39,9 +39,10 @@ asm void osIrqHandler( void )
 
         INASM_EXTERN( osIntrTable )
 
-        sub     lr, lr, #4                      // 復帰アドレス調整
+        // 不正確データアボート有効化（clear HW_PSR_IMPRECISE_ABORT）
+        msr     cpsr_fsxc, #(HW_PSR_IRQ_MODE | HW_PSR_IRQ_DISABLE | HW_PSR_FIQ_DISABLE)
+
         stmfd   sp!, { r0-r4,r12,lr }
-//        stmfd   sp!, { lr }                     // save LR
 
         // 割り込み要因の判定．
 
@@ -68,10 +69,8 @@ asm void osIrqHandler( void )
 #endif // BROM_ENABLE_THREAD
 
 my_undefined_interrupt_1
-//        ldmfd   sp!, { lr }
         ldmfd   sp!, { r0-r4,r12,lr }   // return to interrupted address
-        movs	pc, lr
-//        subs	pc, lr, #4
+        subs    pc, lr, #4
 }
 
 #ifdef BROM_ENABLE_THREAD
diff --git a/trunk/bootrom/build/libraries/os/ARM11/os_timer.c b/trunk/bootrom/build/libraries/os/ARM11/os_timer.c
index 62dc60e..7256ee9 100644
--- a/trunk/bootrom/build/libraries/os/ARM11/os_timer.c
+++ b/trunk/bootrom/build/libraries/os/ARM11/os_timer.c
@@ -105,7 +105,7 @@ void osStartTimerWithUSec( u32 usec, u8 preScale )
 {
     u32 count = ((usec) * (osTimerClock / 1000)) / (preScale+1) / 1000;
 
-    i_osStartTimer( count, preScale, OS_TM_SINGLE_SHOT, OS_TM_INTR_REQ_ENABLE );
+    i_osStartTimer( count, preScale, OS_TM_AUTO_RELOAD, OS_TM_INTR_REQ_ENABLE );
 }
 
 /*---------------------------------------------------------------------------*
@@ -122,7 +122,7 @@ void osStartTimerWithMSec( u32 msec, u8 preScale )
 {
     u32 count = (((msec) * osTimerClock / 1000)) / (preScale+1);
 
-    i_osStartTimer( count, preScale, OS_TM_SINGLE_SHOT, OS_TM_INTR_REQ_ENABLE );
+    i_osStartTimer( count, preScale, OS_TM_AUTO_RELOAD, OS_TM_INTR_REQ_ENABLE );
 }
 
 /*---------------------------------------------------------------------------*
@@ -137,7 +137,7 @@ void osStartTimerWithMSec( u32 msec, u8 preScale )
 
 void osStartTimer( u32 count, u8 preScale )
 {
-    i_osStartTimer( count, preScale, OS_TM_SINGLE_SHOT, OS_TM_INTR_REQ_ENABLE );
+    i_osStartTimer( count, preScale, OS_TM_AUTO_RELOAD, OS_TM_INTR_REQ_ENABLE );
 }
 
 /*---------------------------------------------------------------------------*