diff --git a/build/norfirm/firm-dev/ARM7/main.c b/build/norfirm/firm-dev/ARM7/main.c
index 73409111..f4121c63 100644
--- a/build/norfirm/firm-dev/ARM7/main.c
+++ b/build/norfirm/firm-dev/ARM7/main.c
@@ -18,6 +18,7 @@
 #include "reboot.h"
 
 //#define PRINT_DEBUG
+//#define FIRM_ENABLE_BACKLIGHT
 
 #ifndef PRINT_DEBUG
 #undef  OS_TPrintf
@@ -28,9 +29,11 @@ void TwlSpMain( void )
 {
     OS_TPrintf( "\nNOR Boot time is %d msec.\n", OS_TicksToMilliSecondsBROM32(OS_GetTick()));
 
-//    MIi_CpuClearFast( 0, (void*)HW_TWL_ROM_HEADER_BUF, HW_MAIN_MEM_SYSTEM_END - HW_TWL_ROM_HEADER_BUF );  // include HW_MAIN_MEM_SHARED
     MIi_CpuClearFast( 0, (void*)OSi_GetFromBromAddr(), sizeof(OSFromBromBuf) );
 
+#ifdef FIRM_ENABLE_BACKLIGHT
+//    MIi_CpuClearFast( 0, (void*)HW_TWL_ROM_HEADER_BUF, HW_MAIN_MEM_SYSTEM_END - HW_TWL_ROM_HEADER_BUF );  // include HW_MAIN_MEM_SHARED
+
     OS_InitFIRM();
 
     OS_TPrintf( "\nARM7 starts.\n" );
@@ -44,6 +47,7 @@ void TwlSpMain( void )
     PM_BackLightOn( TRUE );
 
     OS_TPrintf( "\nARM7 ends.\n" );
+#endif // FIRM_ENABLE_BACKLIGHT
 
     REBOOT_DisableInterruptsAndProtectionUnit();
     reg_SCFG_JTAG = REG_SCFG_JTAG_CPUJE_MASK | REG_SCFG_JTAG_ARM7SEL_MASK | REG_SCFG_JTAG_DSPJE_MASK;
diff --git a/build/norfirm/firm-dev/ARM9/main.c b/build/norfirm/firm-dev/ARM9/main.c
index 2fe84bc0..24f86234 100644
--- a/build/norfirm/firm-dev/ARM9/main.c
+++ b/build/norfirm/firm-dev/ARM9/main.c
@@ -18,6 +18,7 @@
 #include "reboot.h"
 
 //#define PRINT_DEBUG
+//#define FIRM_ENABLE_BACKLIGHT
 
 #ifndef PRINT_DEBUG
 #undef  OS_TPrintf
@@ -30,12 +31,16 @@ void TwlMain( void )
 
     MIi_CpuClearFast( 0, (void*)OSi_GetFromBromAddr(), sizeof(OSFromBromBuf) );
 
+#ifdef FIRM_ENABLE_BACKLIGHT
     OS_InitFIRM();
 
     OS_TPrintf( "\nARM9 starts.\n" );
     OS_TPrintf( "\nARM9 ends.\n" );
+#endif // FIRM_ENABLE_BACKLIGHT
 
     REBOOT_DisableInterruptsAndProtectionUnit();
-    OS_Terminate();
+    while (1)
+    {
+    }
 }