diff --git a/arch/mn10300/unit-asb2303/unit-init.c b/arch/mn10300/unit-asb2303/unit-init.c
new file mode 100644
index 0000000..14b2c81
--- /dev/null
+++ b/arch/mn10300/unit-asb2303/unit-init.c
@@ -0,0 +1,60 @@
+/* ASB2303 initialisation
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/param.h>
+#include <linux/init.h>
+#include <linux/device.h>
+
+#include <asm/io.h>
+#include <asm/setup.h>
+#include <asm/processor.h>
+#include <asm/irq.h>
+#include <asm/intctl-regs.h>
+
+/*
+ * initialise some of the unit hardware before gdbstub is set up
+ */
+asmlinkage void __init unit_init(void)
+{
+	/* set up the external interrupts */
+	SET_XIRQ_TRIGGER(0, XIRQ_TRIGGER_HILEVEL);
+	SET_XIRQ_TRIGGER(2, XIRQ_TRIGGER_LOWLEVEL);
+	SET_XIRQ_TRIGGER(3, XIRQ_TRIGGER_HILEVEL);
+	SET_XIRQ_TRIGGER(4, XIRQ_TRIGGER_LOWLEVEL);
+	SET_XIRQ_TRIGGER(5, XIRQ_TRIGGER_LOWLEVEL);
+}
+
+/*
+ * initialise the rest of the unit hardware after gdbstub is ready
+ */
+void __init unit_setup(void)
+{
+}
+
+/*
+ * initialise the external interrupts used by a unit of this type
+ */
+void __init unit_init_IRQ(void)
+{
+	unsigned int extnum;
+
+	for (extnum = 0; extnum < NR_XIRQS; extnum++) {
+		switch (GET_XIRQ_TRIGGER(extnum)) {
+		case XIRQ_TRIGGER_HILEVEL:
+		case XIRQ_TRIGGER_LOWLEVEL:
+			set_irq_handler(XIRQ2IRQ(extnum), handle_level_irq);
+			break;
+		default:
+			break;
+		}
+	}
+}