diff --git a/trunk/bootrom/build/libraries/os/ARM11/Makefile b/trunk/bootrom/build/libraries/os/ARM11/Makefile
index 7f72995..9a91a9c 100644
--- a/trunk/bootrom/build/libraries/os/ARM11/Makefile
+++ b/trunk/bootrom/build/libraries/os/ARM11/Makefile
@@ -45,6 +45,7 @@ SRCS			= \
 				os_cache.c \
 				os_printf.c \
 				os_boot.c \
+				os_event.c \
 				os_mmu.c \
 
 TARGET_LIB		= libos$(BROM_LIBSUFFIX).a
diff --git a/trunk/bootrom/build/libraries/os/ARM9/Makefile b/trunk/bootrom/build/libraries/os/ARM9/Makefile
index 0d3cbc3..4962578 100644
--- a/trunk/bootrom/build/libraries/os/ARM9/Makefile
+++ b/trunk/bootrom/build/libraries/os/ARM9/Makefile
@@ -48,6 +48,7 @@ SRCS			= \
 				os_cache.c \
 				os_printf.c \
 				os_boot.c \
+				os_event.c \
 				os_protectionUnit.c \
 
 TARGET_LIB		= libos_sp$(BROM_LIBSUFFIX).a
diff --git a/trunk/bootrom/build/libraries/os/common/os_event.c b/trunk/bootrom/build/libraries/os/common/os_event.c
new file mode 100644
index 0000000..8b85a0f
--- /dev/null
+++ b/trunk/bootrom/build/libraries/os/common/os_event.c
@@ -0,0 +1,244 @@
+/*---------------------------------------------------------------------------*
+  Project:  TwlSDK - OS
+  File:     os_event.c
+
+  Copyright 2007-2008 Nintendo.  All rights reserved.
+
+  These coded instructions, statements, and computer programs contain
+  proprietary information of Nintendo of America Inc. and/or Nintendo
+  Company Ltd., and are protected by Federal copyright law.  They may
+  not be disclosed to third parties or copied or duplicated in any form,
+  in whole or in part, without the prior written consent of Nintendo.
+
+  $Date::            $
+  $Rev$
+  $Author$
+ *---------------------------------------------------------------------------*/
+/*
+#ifdef SDK_TWL
+#include <twl/memorymap.h>
+#else
+#include <nitro/memorymap.h>
+#endif*/
+
+#include <brom/os.h>
+
+
+#if defined(SDK_TCM_APPLY) && defined(SDK_ARM9)
+#include    <nitro/itcm_begin.h>
+#endif
+
+/*---------------------------------------------------------------------------*
+  Name:         OS_InitEvent
+
+  Description:  initialize event struct
+
+  Arguments:    event   : pointer to event struct
+
+  Returns:      none
+ *---------------------------------------------------------------------------*/
+void osInitEvent( OSEvent *event )
+{
+	osInitThreadQueue( &event->queue );
+	event->flag    = 0;
+}
+
+/*---------------------------------------------------------------------------*
+  Name:         osWaitEvent
+
+  Description:  sleep thread and wait event
+                if event is NULL, just sleep.
+
+  Arguments:    event   : pointer to event struct
+                pattern : event pattern
+                mode    : event mode
+                           OS_EVENT_MODE_AND ... wait for all event bit
+                           OS_EVENT_MODE_OR  ... wait for any event bit
+
+  Returns:      none
+ *---------------------------------------------------------------------------*/
+u32 osWaitEvent(OSEvent* event, u32 pattern, OSEventMode mode )
+{
+	return osWaitEventEx(event, pattern, mode, 0);
+}
+
+/*---------------------------------------------------------------------------*
+  Name:         osWaitEventEx
+
+  Description:  sleep thread and wait event
+                if event is NULL, just sleep.
+
+  Arguments:    event    : pointer to event struct
+                pattern  : event pattern
+                mode     : event mode
+                            OS_EVENT_MODE_AND ... wait for all event bit
+                            OS_EVENT_MODE_OR  ... wait for any event bit
+                clearBit : clear bits (in case of the end of waiting)
+
+  Returns:      none
+ *---------------------------------------------------------------------------*/
+u32 osWaitEventEx(OSEvent* event, u32 pattern, OSEventMode mode, u32 clearBit )
+{
+	u32 retval = 0;
+    OSIntrMode enable = osDisableInterrupts();
+
+	SDK_ASSERT( event );
+
+	switch( mode )
+	{
+		case OS_EVENT_MODE_AND:
+			while( (event->flag & pattern) != pattern )
+			{
+				osSleepThread(&event->queue);
+			}
+			retval = event->flag;
+			break;
+		case OS_EVENT_MODE_OR:
+			while( (event->flag & pattern) == 0 )
+			{
+				osSleepThread(&event->queue);
+			}
+			retval = event->flag;
+			break;
+	}
+
+	//---- clear flag
+	if ( retval )
+	{
+		event->flag &= ~clearBit;
+	}
+
+    (void)osRestoreInterrupts(enable);
+	return retval;
+}
+
+/*---------------------------------------------------------------------------*
+  Name:         osSignalEvent
+
+  Description:  set event bit and wakeup thread.
+                if setPattern == 0, do nothing
+
+  Arguments:    event      : pointer to event struct
+                setPattern : bit pattern to set
+
+  Returns:      none
+ *---------------------------------------------------------------------------*/
+void osSignalEvent(OSEvent* event, u32 setPattern)
+{
+    OSIntrMode enable = osDisableInterrupts();
+	SDK_ASSERT( event );
+
+	if ( setPattern )
+	{
+		event->flag |= setPattern;
+		osWakeupThread( &event->queue );
+	}
+
+	(void)osRestoreInterrupts(enable);
+}
+
+/*---------------------------------------------------------------------------*
+  Name:         osClearAllEvent
+
+  Description:  clear all event bits
+
+  Arguments:    event  : pointer to event struct
+
+  Returns:      none
+ *---------------------------------------------------------------------------*/
+void osClearAllEvent(OSEvent* event)
+{
+	SDK_ASSERT( event );
+	event->flag = 0;
+}
+
+/*---------------------------------------------------------------------------*
+  Name:         osClearEvent
+
+  Description:  clear specified event bits
+
+  Arguments:    event    : pointer to event struct
+                clearBit : clear bits
+
+  Returns:      none
+ *---------------------------------------------------------------------------*/
+void osClearEvent(OSEvent* event, u32 clearBit)
+{
+    OSIntrMode enable = osDisableInterrupts();
+	SDK_ASSERT( event );
+
+	event->flag &= ~clearBit;
+
+	(void)osRestoreInterrupts(enable);
+}
+
+/*---------------------------------------------------------------------------*
+  Name:         osPollEvent
+
+  Description:  poll event struct if condition matches
+
+  Arguments:    event   : waiting condition
+                pattern : event pattern
+                mode    : event mode
+                           OS_EVENT_MODE_AND ... wait for all event bit
+                           OS_EVENT_MODE_OR  ... wait for any event bit
+
+  Returns:      not 0  ... matched. return the event flag.
+                0      ... not match.
+ *---------------------------------------------------------------------------*/
+u32 osPollEvent(OSEvent* event, u32 pattern, OSEventMode mode )
+{
+	return osPollEventEx( event, pattern, mode, 0 );
+}
+
+/*---------------------------------------------------------------------------*
+  Name:         osPollEventEx
+
+  Description:  poll event struct if condition matches
+
+  Arguments:    event    : pointer to event struct
+                pattern  : event pattern
+                mode     : event mode
+                            OS_EVENT_MODE_AND ... wait for all event bit
+                            OS_EVENT_MODE_OR  ... wait for any event bit
+                clearBit : clear bits (in case of matching)
+
+  Returns:      not 0  ... matched. return the event flag.
+                0      ... not match.
+ *---------------------------------------------------------------------------*/
+u32 osPollEventEx(OSEvent* event, u32 pattern, OSEventMode mode, u32 clearBit )
+{
+	u32 retval = 0;
+    OSIntrMode enable = osDisableInterrupts();
+
+	SDK_ASSERT( event );
+
+	switch( mode )
+	{
+		case OS_EVENT_MODE_AND:
+			if ( (event->flag & pattern) == pattern )
+			{
+				retval = event->flag;
+			}
+			break;
+		case OS_EVENT_MODE_OR:
+			if ( event->flag & pattern )
+			{
+				retval = event->flag;
+			}
+			break;
+	}
+
+	//---- clear flag
+	if ( retval )
+	{
+		event->flag &= ~clearBit;
+	}
+
+    (void)osRestoreInterrupts(enable);
+	return retval;
+}
+
+#if defined(SDK_TCM_APPLY) && defined(SDK_ARM9)
+#include    <nitro/itcm_end.h>
+#endif
diff --git a/trunk/bootrom/include/brom/os.h b/trunk/bootrom/include/brom/os.h
index 40359d0..49b3019 100644
--- a/trunk/bootrom/include/brom/os.h
+++ b/trunk/bootrom/include/brom/os.h
@@ -43,6 +43,7 @@ extern "C" {
 #include <brom/os/common/printf.h>
 #include <brom/os/common/spinLock.h>
 #include <brom/os/common/boot.h>
+#include <brom/os/common/event.h>
 
 #ifdef SDK_ARM11
 #include <brom/os/ARM11/mmu.h>
diff --git a/trunk/bootrom/include/brom/os/common/event.h b/trunk/bootrom/include/brom/os/common/event.h
new file mode 100644
index 0000000..eaa8d9d
--- /dev/null
+++ b/trunk/bootrom/include/brom/os/common/event.h
@@ -0,0 +1,200 @@
+/*---------------------------------------------------------------------------*
+  Project:  TwlSDK - OS - include
+  File:     event.h
+
+  Copyright 2003-2008 Nintendo.  All rights reserved.
+
+  These coded instructions, statements, and computer programs contain
+  proprietary information of Nintendo of America Inc. and/or Nintendo
+  Company Ltd., and are protected by Federal copyright law.  They may
+  not be disclosed to third parties or copied or duplicated in any form,
+  in whole or in part, without the prior written consent of Nintendo.
+
+  $Date::            $
+  $Rev$
+  $Author$
+ *---------------------------------------------------------------------------*/
+
+#ifndef NITRO_OS_EVENT_H_
+#define NITRO_OS_EVENT_H_
+
+#include <brom/os/common/thread.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+//---------------- event mode
+typedef enum
+{
+	OS_EVENT_MODE_AND = 0,
+	OS_EVENT_MODE_OR  = 1
+}
+OSEventMode;
+
+
+//---------------- event parameter
+typedef struct
+{
+	vu32           flag;
+	OSThreadQueue  queue;
+}
+OSEvent;
+
+
+/*---------------------------------------------------------------------------*
+  Name:         osInitEvent
+
+  Description:  initialize event struct
+
+  Arguments:    event   : pointer to event struct
+
+  Returns:      none
+ *---------------------------------------------------------------------------*/
+void osInitEvent( OSEvent *event );
+
+/*---------------------------------------------------------------------------*
+  Name:         osWaitEvent
+
+  Description:  sleep thread and wait event
+                if event is NULL, just sleep.
+
+  Arguments:    event   : pointer to event struct
+                pattern : event pattern
+                mode    : event mode
+                           OS_EVENT_MODE_AND ... wait for all event bit
+                           OS_EVENT_MODE_OR  ... wait for any event bit
+
+  Returns:      none
+ *---------------------------------------------------------------------------*/
+u32 osWaitEvent(OSEvent* event, u32 pattern, OSEventMode mode );
+
+/*---------------------------------------------------------------------------*
+  Name:         osWaitEventEx
+
+  Description:  sleep thread and wait event
+                if event is NULL, just sleep.
+
+  Arguments:    event    : pointer to event struct
+                pattern  : event pattern
+                mode     : event mode
+                            OS_EVENT_MODE_AND ... wait for all event bit
+                            OS_EVENT_MODE_OR  ... wait for any event bit
+                clearBit : clear bits (in case of the end of waiting)
+
+  Returns:      none
+ *---------------------------------------------------------------------------*/
+u32 osWaitEventEx(OSEvent* event, u32 pattern, OSEventMode mode, u32 clearBit );
+
+
+//---- inline access
+static inline u32 osWaitEvent_And( OSEvent* event, u32 pattern )
+{
+	return osWaitEventEx( event, pattern, OS_EVENT_MODE_AND, 0 );
+}
+static inline u32 osWaitEvent_Or(OSEvent* event, u32 pattern )
+{
+	return osWaitEventEx( event, pattern, OS_EVENT_MODE_OR, 0 );
+}
+static inline u32 osWaitEventEx_And( OSEvent* event, u32 pattern, u32 clearBit )
+{
+	return osWaitEventEx( event, pattern, OS_EVENT_MODE_AND, clearBit );
+}
+static inline u32 osWaitEventEx_Or(OSEvent* event, u32 pattern, u32 clearBit )
+{
+	return osWaitEventEx( event, pattern, OS_EVENT_MODE_OR, clearBit );
+}
+
+/*---------------------------------------------------------------------------*
+  Name:         osSignalEvent
+
+  Description:  set event bit and wakeup thread.
+                if setPattern == 0, do nothing
+
+  Arguments:    event      : pointer to event struct
+                setPattern : bit pattern to set
+
+  Returns:      none
+ *---------------------------------------------------------------------------*/
+void osSignalEvent(OSEvent* event, u32 setPattern);
+
+/*---------------------------------------------------------------------------*
+  Name:         osClearEvent
+
+  Description:  clear specified event bits
+
+  Arguments:    event    : pointer to event struct
+                clearBit : clear bits
+
+  Returns:      none
+ *---------------------------------------------------------------------------*/
+void osClearEvent(OSEvent* event, u32 clearBit);
+
+/*---------------------------------------------------------------------------*
+  Name:         osClearAllEvent
+
+  Description:  clear all event bits
+
+  Arguments:    event  : pointer to event struct
+
+  Returns:      none
+ *---------------------------------------------------------------------------*/
+void osClearAllEvent(OSEvent* event);
+
+/*---------------------------------------------------------------------------*
+  Name:         osPollEvent
+
+  Description:  poll event struct if condition matches
+
+  Arguments:    event   : waiting condition
+                pattern : event pattern
+                mode    : event mode
+                           OS_EVENT_MODE_AND ... wait for all event bit
+                           OS_EVENT_MODE_OR  ... wait for any event bit
+
+  Returns:      not 0  ... matched. returnd the event flag.
+                0      ... not match.
+ *---------------------------------------------------------------------------*/
+u32 osPollEvent(OSEvent* event, u32 pattern, OSEventMode mode );
+
+/*---------------------------------------------------------------------------*
+  Name:         osPollEventEx
+
+  Description:  poll event struct if condition matches
+
+  Arguments:    event    : pointer to event struct
+                pattern  : event pattern
+                mode     : event mode
+                            OS_EVENT_MODE_AND ... wait for all event bit
+                            OS_EVENT_MODE_OR  ... wait for any event bit
+                clearBit : clear bits (in case of matching)
+
+  Returns:      not 0  ... matched. returnd the event flag.
+                0      ... not match.
+ *---------------------------------------------------------------------------*/
+u32 osPollEventEx(OSEvent* event, u32 pattern, OSEventMode mode, u32 clearBit );
+
+//---- inline access
+static inline u32 osPollEvent_And( OSEvent* event, u32 pattern )
+{
+	return osPollEventEx( event, pattern, OS_EVENT_MODE_AND, 0 );
+}
+static inline u32 osPollEvent_Or(OSEvent* event, u32 pattern )
+{
+	return osPollEventEx( event, pattern, OS_EVENT_MODE_OR, 0 );
+}
+static inline u32 osPollEventEx_And( OSEvent* event, u32 pattern, u32 clearBit )
+{
+	return osPollEventEx( event, pattern, OS_EVENT_MODE_AND, clearBit );
+}
+static inline u32 osPollEventEx_Or(OSEvent* event, u32 pattern, u32 clearBit )
+{
+	return osPollEventEx( event, pattern, OS_EVENT_MODE_OR, clearBit );
+}
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+/* NITRO_OS_EVENT_H_ */
+#endif
diff --git a/trunk/firmware/build/libraries/os/ARM11/Makefile b/trunk/firmware/build/libraries/os/ARM11/Makefile
index b2124f9..8aa06e1 100644
--- a/trunk/firmware/build/libraries/os/ARM11/Makefile
+++ b/trunk/firmware/build/libraries/os/ARM11/Makefile
@@ -46,6 +46,7 @@ SRCS			= \
 				os_cache.c \
 				os_printf.c \
 				os_boot.c \
+				os_event.c \
 				os_mmu.c \
 
 TARGET_LIB		= libos$(FIRM_LIBSUFFIX).a
diff --git a/trunk/firmware/build/libraries/os/ARM9/Makefile b/trunk/firmware/build/libraries/os/ARM9/Makefile
index 91d38bf..d74293e 100644
--- a/trunk/firmware/build/libraries/os/ARM9/Makefile
+++ b/trunk/firmware/build/libraries/os/ARM9/Makefile
@@ -50,6 +50,7 @@ SRCS			= \
 				os_printf.c \
 				os_boot.c \
 				os_protectionUnit.c \
+				os_event.c \
 
 TARGET_LIB		= libos_sp$(FIRM_LIBSUFFIX).a