diff --git a/trunk/bootrom/build/buildtools/commondefs.config b/trunk/bootrom/build/buildtools/commondefs.config
index 914ac62..695507e 100644
--- a/trunk/bootrom/build/buildtools/commondefs.config
+++ b/trunk/bootrom/build/buildtools/commondefs.config
@@ -22,6 +22,7 @@ BROM_COMMONDEFS_CONFIG_ = TRUE
 #BROM_DEV_EARLY_RELEASE = TRUE
 #BROM_DEF_LINK_SCATLD = TRUE
 BROM_ENABLE_SCATLD_VFP = TRUE
+#BROM_ENABLE_SMP_CODE = TRUE
 
 ifdef BROM_ENABLE_BOOTROM_WRITE
 MACRO_FLAGS	+= -DBROM_ENABLE_BOOTROM_WRITE
@@ -37,6 +38,9 @@ ifeq ($(CODEGEN_PROC),ARM11)
 MACRO_FLAGS	+= -DBROM_ENABLE_SCATLD_VFP
 endif
 endif
+ifdef BROM_ENABLE_SMP_CODE
+MACRO_FLAGS	+= -DBROM_ENABLE_SMP_CODE
+endif
 
 #----------------------------------------------------------------------------
 endif	# BROM_COMMONDEFS_CONFIG_
diff --git a/trunk/bootrom/build/libraries/os/common/os_interrupt.c b/trunk/bootrom/build/libraries/os/common/os_interrupt.c
index 9aafa52..079fd68 100644
--- a/trunk/bootrom/build/libraries/os/common/os_interrupt.c
+++ b/trunk/bootrom/build/libraries/os/common/os_interrupt.c
@@ -836,7 +836,7 @@ BOOL osSetInterruptCheckID( OSIntrID id )
 #ifdef SDK_ARM11
     u32 ofs = id/32;
     u32 sft = id%32;
-    u32 *buf = &((OSIntrMask *)HW_INTR_CHECK0_BUF)->w[ofs];
+    u32 *buf = &((OSIntrMask *)OS_INTR_CHECK_BUF())->w[ofs];
 #else // SDK_ARM9
     u32 sft = id;
     u32 *buf = (OSIntrMask *)HW_INTR_CHECK_BUF;
@@ -865,7 +865,7 @@ BOOL osClearInterruptCheckID( OSIntrID id )
 #ifdef SDK_ARM11
     u32 ofs = id/32;
     u32 sft = id%32;
-    u32 *buf = &((OSIntrMask *)HW_INTR_CHECK0_BUF)->w[ofs];
+    u32 *buf = &((OSIntrMask *)OS_INTR_CHECK_BUF())->w[ofs];
 #else // SDK_ARM9
     u32 sft = id;
     u32 *buf = (OSIntrMask *)HW_INTR_CHECK_BUF;
@@ -893,7 +893,7 @@ BOOL osIsInterruptCheckID( OSIntrID id )
 #ifdef SDK_ARM11
     u32 ofs = id/32;
     u32 sft = id%32;
-    u32 *buf = &((OSIntrMask *)HW_INTR_CHECK0_BUF)->w[ofs];
+    u32 *buf = &((OSIntrMask *)OS_INTR_CHECK_BUF())->w[ofs];
 #else // SDK_ARM9
     u32 sft = id;
     u32 *buf = (OSIntrMask *)HW_INTR_CHECK_BUF;
@@ -917,10 +917,11 @@ void osSetInterruptCheckMask( OSIntrMask mask )
 {
     OSIntrMode enabled = osDisableInterrupts();
 #ifdef SDK_ARM11
-    ((OSIntrMask *)HW_INTR_CHECK0_BUF)->w[0] |= mask.w[0];
-    ((OSIntrMask *)HW_INTR_CHECK0_BUF)->w[1] |= mask.w[1];
-    ((OSIntrMask *)HW_INTR_CHECK0_BUF)->w[2] |= mask.w[2];
-    ((OSIntrMask *)HW_INTR_CHECK0_BUF)->w[3] |= mask.w[3];
+    OSIntrMask *buf = (void *)OS_INTR_CHECK_BUF();
+    buf->w[0] |= mask.w[0];
+    buf->w[1] |= mask.w[1];
+    buf->w[2] |= mask.w[2];
+    buf->w[3] |= mask.w[3];
 #else // SDK_ARM9
     *(OSIntrMask *)HW_INTR_CHECK_BUF |= mask;
 #endif // SDK_ARM9
@@ -940,10 +941,11 @@ void osClearInterruptCheckMask( OSIntrMask mask )
 {
     OSIntrMode enabled = osDisableInterrupts();
 #ifdef SDK_ARM11
-    ((OSIntrMask *)HW_INTR_CHECK0_BUF)->w[0] &= ~mask.w[0];
-    ((OSIntrMask *)HW_INTR_CHECK0_BUF)->w[1] &= ~mask.w[1];
-    ((OSIntrMask *)HW_INTR_CHECK0_BUF)->w[2] &= ~mask.w[2];
-    ((OSIntrMask *)HW_INTR_CHECK0_BUF)->w[3] &= ~mask.w[3];
+    OSIntrMask *buf = (void *)OS_INTR_CHECK_BUF();
+    buf->w[0] &= ~mask.w[0];
+    buf->w[1] &= ~mask.w[1];
+    buf->w[2] &= ~mask.w[2];
+    buf->w[3] &= ~mask.w[3];
 #else // SDK_ARM9
     *(OSIntrMask *)HW_INTR_CHECK_BUF &= ~mask;
 #endif // SDK_ARM9
@@ -964,10 +966,11 @@ BOOL osIsInterruptCheckMask( OSIntrMask mask )
     u32 tmp;
 #ifdef SDK_ARM11
     OSIntrMode enabled = osDisableInterrupts();
-    tmp  = ((OSIntrMask *)HW_INTR_CHECK0_BUF)->w[0] & mask.w[0];
-    tmp |= ((OSIntrMask *)HW_INTR_CHECK0_BUF)->w[1] & mask.w[1];
-    tmp |= ((OSIntrMask *)HW_INTR_CHECK0_BUF)->w[2] & mask.w[2];
-    tmp |= ((OSIntrMask *)HW_INTR_CHECK0_BUF)->w[3] & mask.w[3];
+    OSIntrMask *buf = (void *)OS_INTR_CHECK_BUF();
+    tmp  = buf->w[0] & mask.w[0];
+    tmp |= buf->w[1] & mask.w[1];
+    tmp |= buf->w[2] & mask.w[2];
+    tmp |= buf->w[3] & mask.w[3];
     (void)osRestoreInterrupts( enabled );
 #else // SDK_ARM9
     tmp = osGetInterruptCheckMask() & mask;
diff --git a/trunk/bootrom/build/libraries/os/common/os_system.c b/trunk/bootrom/build/libraries/os/common/os_system.c
index 50393cd..0b8d6e6 100644
--- a/trunk/bootrom/build/libraries/os/common/os_system.c
+++ b/trunk/bootrom/build/libraries/os/common/os_system.c
@@ -18,6 +18,33 @@
 
 #define osTPrintf(...) ((void)0)
 
+#ifdef SDK_ARM11
+#ifdef BROM_ENABLE_SMP_CODE
+
+//============================================================================
+//          MULTI CORE
+//============================================================================
+/*---------------------------------------------------------------------------*
+  Name:         osGetCpuID
+
+  Description:  Get CPU-ID
+
+  Arguments:    None.
+
+  Returns:      CPU-ID (field 0-3)
+ *---------------------------------------------------------------------------*/
+#include <brom/code32.h>
+asm u8 osGetCpuID( void )
+{
+    mrc     p15,0, r0, c0, c0, 5
+    and     r0, r0, #HW_C0_AP_CPU_ID_MASK
+
+    bx      lr
+}
+#include <brom/codereset.h>
+
+#endif // BROM_ENABLE_SMP_CODE
+#endif // SDK_ARM11
 
 //============================================================================
 //          PROCESSER MODE
diff --git a/trunk/bootrom/include/brom/os/common/system.h b/trunk/bootrom/include/brom/os/common/system.h
index f8670f7..3d6717d 100644
--- a/trunk/bootrom/include/brom/os/common/system.h
+++ b/trunk/bootrom/include/brom/os/common/system.h
@@ -75,8 +75,16 @@ OSProcMode;
 #ifdef SDK_ARM9
 #define OS_SVC_STACK_SIZE               0x1000
 #define OS_IRQ_STACK_SIZE               0x1000
-#else // SDK_MPCORE
-#endif // SDK_MPCORE
+#endif // SDK_ARM9
+
+#ifdef SDK_ARM11
+#ifdef BROM_ENABLE_SMP_CODE
+#define OS_INTR_CHECK_BUF_OFFSET()      (-osGetCpuID()*16)
+#else // BROM_ENABLE_SMP_CODE
+#define OS_INTR_CHECK_BUF_OFFSET()      0
+#endif // BROM_ENABLE_SMP_CODE
+#define OS_INTR_CHECK_BUF()             (HW_INTR_CHECK0_BUF + OS_INTR_CHECK_BUF_OFFSET())
+#endif // SDK_ARM11
 
 
 //---- sec to cpu cycle
@@ -124,6 +132,27 @@ static inline u32 i_osCpuCycleToNSec( OSCpuCycle cyc )
 }
 
 
+//============================================================================
+//          MULTI CORE
+//============================================================================
+/*---------------------------------------------------------------------------*
+  Name:         osGetCpuID
+
+  Description:  Get CPU-ID
+
+  Arguments:    None.
+
+  Returns:      CPU-ID (field 0-3)
+ *---------------------------------------------------------------------------*/
+#ifdef BROM_ENABLE_SMP_CODE
+u8 osGetCpuID( void );
+#else // BROM_ENABLE_SMP_CODE
+static inline u8 osGetCpuID( void )
+{
+    return 0;
+}
+#endif // BROM_ENABLE_SMP_CODE
+
 //============================================================================
 //          PROCESSER MODE
 //============================================================================