diff --git a/arch/powerpc/cpu/mpc512x/start.S b/arch/powerpc/cpu/mpc512x/start.S
index d52cc4d..2265c8c 100644
--- a/arch/powerpc/cpu/mpc512x/start.S
+++ b/arch/powerpc/cpu/mpc512x/start.S
@@ -613,10 +613,12 @@
 	beq	4f
 3:	lwzu	r4,4(r3)
 	lwzux	r0,r4,r11
+	cmpwi	r0,0
 	add	r0,r0,r11
 	stw	r10,0(r3)
+	beq-	5f
 	stw	r0,0(r4)
-	bdnz	3b
+5:	bdnz	3b
 4:
 clear_bss:
 	/*