diff --git a/src/northbridge/intel/i5000/Makefile.inc b/src/northbridge/intel/i5000/Makefile.inc
index a5623c02bd..5e75159fca 100644
--- a/src/northbridge/intel/i5000/Makefile.inc
+++ b/src/northbridge/intel/i5000/Makefile.inc
@@ -19,3 +19,4 @@
 
 driver-y += northbridge.c
 romstage-y += raminit.c udelay.c
+cpu_incs += src/northbridge/intel/i5000/halt_second_bsp.S
diff --git a/src/northbridge/intel/i5000/halt_second_bsp.S b/src/northbridge/intel/i5000/halt_second_bsp.S
new file mode 100644
index 0000000000..a1a1b156db
--- /dev/null
+++ b/src/northbridge/intel/i5000/halt_second_bsp.S
@@ -0,0 +1,29 @@
+	/* Save BIST result */
+
+	movl	%eax, %ebp
+
+	/* Read the semaphore register of i5000 (BOFL0).
+	   If it returns zero, it means there was already
+	   another read by another CPU */
+
+	movl	$0x800080c0, %eax
+	movw	$0xcf8, %dx
+	outl	%eax, %dx
+
+	addw	$4, %dx
+	inl	%dx, %eax
+	cmp	$0, %eax
+	jne	1f
+
+	/* degrade BSP to AP */
+	mov	$0x1b, %ecx
+	rdmsr
+	andl $(~0x100), %eax
+	wrmsr
+
+	cli
+loop:	hlt
+	jmp	loop
+
+1:	/* Restore BIST */
+	mov	%ebp, %eax