diff --git a/Kernel/arch/armv7/Makefile b/Kernel/arch/armv7/Makefile
index 214137a34e0e745beded0cf4a2b4df6b30465896..1bb9496d1c3d4da3800591fc6dc9cc5c648cbed4 100644
--- a/Kernel/arch/armv7/Makefile
+++ b/Kernel/arch/armv7/Makefile
@@ -13,6 +13,6 @@ LDFLAGS += `$(CC) --print-libgcc-file-name`
 A_OBJ  = start.ao main.o lib.o lib.ao time.o pci.o debug.o
 A_OBJ += mm_phys.o mm_virt.o proc.o proc.ao
 
-main.c: Makefile.BuildNum.$(ARCH)
+#main.c: Makefile.BuildNum.$(ARCH)
 
 POSTBUILD = objcopy $(BIN) -F binary $(BIN)
diff --git a/Kernel/arch/armv7/start.S b/Kernel/arch/armv7/start.S
index da57360ba3ae7e9305aa1ac85b8e496cb1f6ca33..817dca1ff9642e40a07741644ac5c20bcdf004a8 100644
--- a/Kernel/arch/armv7/start.S
+++ b/Kernel/arch/armv7/start.S
@@ -18,6 +18,10 @@ ivt_fiq:	b .     	@ 0x1C FIQ (Fast interrupt)
 
 .globl _start
 _start:
+	ldr r0, =DEBUG_UART_PADDR
+	ldr r1, 'A'
+	str r0, r1	
+
 	ldr r0, =kernel_table0-KERNEL_BASE
 	mcr p15, 0, r0, c2, c0, 1	@ Set TTBR1 to r0
 	mcr p15, 0, r0, c2, c0, 0	@ Set TTBR0 to r0 too (for identity)
@@ -305,3 +309,5 @@ kernel_exception_map:
 stack:
 	.space MM_KSTACK_SIZE, 0	@ Original kernel stack
 
+; vim: ts=8, ft=armv7
+