Index: sys/powerpc/powerpc/mp_machdep.c
===================================================================
--- sys/powerpc/powerpc/mp_machdep.c
+++ sys/powerpc/powerpc/mp_machdep.c
@@ -197,6 +197,7 @@
 {
 	struct pcpu *pc;
 	int cpus, timeout;
+	int ret;
 
 	if (mp_ncpus <= 1)
 		return;
@@ -215,12 +216,12 @@
 				printf("Waking up CPU %d (dev=%x)\n",
 				    pc->pc_cpuid, (int)pc->pc_hwref);
 
-			platform_smp_start_cpu(pc);
-			
-			timeout = 2000;	/* wait 2sec for the AP */
-			while (!pc->pc_awake && --timeout > 0)
-				DELAY(1000);
-
+			ret = platform_smp_start_cpu(pc);
+			if (ret == 0) {
+				timeout = 2000;	/* wait 2sec for the AP */
+				while (!pc->pc_awake && --timeout > 0)
+					DELAY(1000);
+			}
 		} else {
 			PCPU_SET(pir, mfspr(SPR_PIR));
 			pc->pc_awake = 1;