diff --git a/src/parisc/head.S b/src/parisc/head.S
index 3eb7e9c..3cfe9fd 100644
--- a/src/parisc/head.S
+++ b/src/parisc/head.S
@@ -176,13 +176,14 @@
 	rsm	PSW_I, %r0	/* disable local irqs */
 	mtctl	%r0, CR_EIEM
 
-	/* on 64bit: Address of PDCE_PROC for each non-monarch processor in GR26. */
-	load32	BOOTADDR(pdc_entry), %r26
+	/* provide PDCE_PROC entry in arg0 (required on 64-bit) */
+	load32	MEM_PDC_ENTRY, %arg0
 
 	/* jump to rendevouz */
 	ldw	0x10(%r0),%r3	/* MEM_RENDEZ */
 	/* ldw	0x28(%r0),%r0	MEM_RENDEZ_HI - assume addr < 4GB */
-	cmpb,=,n  %r0,%r3,startup	/* branch to startup if not yet initialized */
+	cmpb,=,n  %r0,%r3,enter_smp_idle_loop
+	nop			/* failed backward branch is nullified */
 	load32	startup, %rp
 	bv,n	0(%r3)
 
diff --git a/src/parisc/hppa_hardware.h b/src/parisc/hppa_hardware.h
index f74e770..d4230da 100644
--- a/src/parisc/hppa_hardware.h
+++ b/src/parisc/hppa_hardware.h
@@ -7,6 +7,8 @@
 #define FIRMWARE_START  0xf0000000
 #define FIRMWARE_END    0xf0800000
 
+#define MEM_PDC_ENTRY       0x4800  /* PDC entry address */
+
 #define DEVICE_HPA_LEN  0x00100000
 
 #define GSC_HPA         0xffc00000
diff --git a/src/parisc/parisc.c b/src/parisc/parisc.c
index d4eea02..2be2a16 100644
--- a/src/parisc/parisc.c
+++ b/src/parisc/parisc.c
@@ -161,8 +161,6 @@
 
 #define MIN_RAM_SIZE	(16*1024*1024) // 16 MB
 
-#define MEM_PDC_ENTRY	0x4800	/* as in a B160L */
-
 #define CPU_HPA_IDX(i)  (CPU_HPA + (i)*0x1000) /* CPU_HPA of CPU#i */
 
 static int index_of_CPU_HPA(unsigned long hpa) {