diff --git a/arch/sparc/kernel/sun4d_irq.c b/arch/sparc/kernel/sun4d_irq.c
index eaec8a9..1d13c5b 100644
--- a/arch/sparc/kernel/sun4d_irq.c
+++ b/arch/sparc/kernel/sun4d_irq.c
@@ -334,7 +334,8 @@
                                     unsigned int real_irq)
 {
 	struct device_node *dp = op->dev.of_node;
-	struct device_node *io_unit, *sbi = dp->parent;
+	struct device_node *board_parent, *bus = dp->parent;
+	char *bus_connection;
 	const struct linux_prom_registers *regs;
 	unsigned int pil;
 	unsigned int irq;
@@ -342,13 +343,20 @@
 	int sbusl;
 
 	irq = real_irq;
-	while (sbi) {
-		if (!strcmp(sbi->name, "sbi"))
+	while (bus) {
+		if (!strcmp(bus->name, "sbi")) {
+			bus_connection = "io-unit";
 			break;
+		}
 
-		sbi = sbi->parent;
+		if (!strcmp(bus->name, "bootbus")) {
+			bus_connection = "cpu-unit";
+			break;
+		}
+
+		bus = bus->parent;
 	}
-	if (!sbi)
+	if (!bus)
 		goto err_out;
 
 	regs = of_get_property(dp, "reg", NULL);
@@ -358,17 +366,19 @@
 	slot = regs->which_io;
 
 	/*
-	 *  If SBI's parent is not io-unit or the io-unit lacks
-	 * a "board#" property, something is very wrong.
+	 * If Bus nodes parent is not io-unit/cpu-unit or the io-unit/cpu-unit
+	 * lacks a "board#" property, something is very wrong.
 	 */
-	if (!sbi->parent || strcmp(sbi->parent->name, "io-unit")) {
-		printk("%s: Error, parent is not io-unit.\n", sbi->full_name);
+	if (!bus->parent || strcmp(bus->parent->name, bus_connection)) {
+		printk(KERN_ERR "%s: Error, parent is not %s.\n",
+			bus->full_name, bus_connection);
 		goto err_out;
 	}
-	io_unit = sbi->parent;
-	board = of_getintprop_default(io_unit, "board#", -1);
+	board_parent = bus->parent;
+	board = of_getintprop_default(board_parent, "board#", -1);
 	if (board == -1) {
-		printk("%s: Error, lacks board# property.\n", io_unit->full_name);
+		printk(KERN_ERR "%s: Error, lacks board# property.\n",
+			board_parent->full_name);
 		goto err_out;
 	}