diff --git a/build/buildtools/commondefs b/build/buildtools/commondefs
index e5c82932..98c45b61 100644
--- a/build/buildtools/commondefs
+++ b/build/buildtools/commondefs
@@ -18,6 +18,7 @@
 ifndef TWL_IPL_COMMONDEFS_
 TWL_IPL_COMMONDEFS_ = TRUE
 
+FIRM_USE_TWLSDK_KEYS = TRUE
 
 ifeq	($(TARGET_FIRM),SYSTEMMENU)
 include $(TWL_IPL_RED_ROOT)/build/buildtools/commondefs.sysmenu
@@ -25,6 +26,10 @@ else
 include $(TWL_IPL_RED_ROOT)/build/buildtools/commondefs.firm
 endif
 
+ifdef FIRM_USE_TWLSDK_KEYS
+MACRO_FLAGS	+= -DFIRM_USE_TWLSDK_KEYS=$(FIRM_USE_TWLSDK_KEYS)
+endif
+
 #----------------------------------------------------------------------------
 endif	# TWL_IPL_COMMONDEFS_
 #----- End of commondefs -----
diff --git a/build/libraries/os/common/os_boot.c b/build/libraries/os/common/os_boot.c
index e4b2195d..dc7f9911 100644
--- a/build/libraries/os/common/os_boot.c
+++ b/build/libraries/os/common/os_boot.c
@@ -76,6 +76,19 @@ void OS_BootWithRomHeaderFromFIRM( ROM_Header* rom_header )
     // post clear
     mem_list[i++] = NULL;
     SDK_ASSERT(i <= sizeof(mem_list)/sizeof(mem_list[0]));
+
+#ifdef FIRM_USE_TWLSDK_KEYS
+    // TwlSDK内の鍵を使っている時は量産用CPUではブートしない
+#ifdef SDK_ARM9
+    if ( ! ((*(u8*)OS_CHIPTYPE_DEBUGGER_ADDR & OS_CHIPTYPE_DEBUGGER_MASK)) )
+#else   // SDK_ARM7
+    if ( ! ((*(u8*)HWi_WSYS08_ADDR & HWi_WSYS08_OP_OPT_MASK)) )
+#endif  // SDK_ARM7
+    {
+        OS_Terminate();
+    }
+#endif // FIRM_USE_SDK_KEYS
+
     REBOOT_Execute(entry, wram_reg, mem_list, code_buf, stack_top, target, scfg, jtag);
     OS_Terminate();
 }