diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 617765d5c9ab..24c33610615b 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -391,6 +391,10 @@ config SH_LBOX_RE2
 	help
 	  Select L-BOX RE2 if configuring for the NTT COMWARE L-BOX RE2.
 
+config SH_X3PROTO
+	bool "SH-X3 Prototype board"
+	depends on CPU_SUBTYPE_SHX3
+
 endmenu
 
 source "arch/sh/boards/renesas/hs7751rvoip/Kconfig"
diff --git a/arch/sh/Makefile b/arch/sh/Makefile
index 97ac58682d0f..37cf636fba55 100644
--- a/arch/sh/Makefile
+++ b/arch/sh/Makefile
@@ -118,6 +118,7 @@ machdir-$(CONFIG_SH_7751_SYSTEMH)		+= renesas/systemh
 machdir-$(CONFIG_SH_EDOSK7705)			+= renesas/edosk7705
 machdir-$(CONFIG_SH_HIGHLANDER)			+= renesas/r7780rp
 machdir-$(CONFIG_SH_7710VOIPGW)			+= renesas/sh7710voipgw
+machdir-$(CONFIG_SH_X3PROTO)			+= renesas/x3proto
 machdir-$(CONFIG_SH_SH4202_MICRODEV)		+= superh/microdev
 machdir-$(CONFIG_SH_LANDISK)			+= landisk
 machdir-$(CONFIG_SH_TITAN)			+= titan
diff --git a/arch/sh/boards/renesas/x3proto/Makefile b/arch/sh/boards/renesas/x3proto/Makefile
new file mode 100644
index 000000000000..2b9dba458932
--- /dev/null
+++ b/arch/sh/boards/renesas/x3proto/Makefile
@@ -0,0 +1 @@
+obj-y += setup.o
diff --git a/arch/sh/boards/renesas/x3proto/setup.c b/arch/sh/boards/renesas/x3proto/setup.c
new file mode 100644
index 000000000000..5dfa0f31cd2d
--- /dev/null
+++ b/arch/sh/boards/renesas/x3proto/setup.c
@@ -0,0 +1,54 @@
+/*
+ * arch/sh/boards/renesas/x3proto/setup.c
+ *
+ * Renesas SH-X3 Prototype Board Support.
+ *
+ * Copyright (C) 2007 Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+
+static struct resource heartbeat_resources[] = {
+	[0] = {
+		.start	= 0xb8140020,
+		.end	= 0xb8140020 + 8 - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+};
+
+static struct platform_device heartbeat_device = {
+	.name		= "heartbeat",
+	.id		= -1,
+	.num_resources	= ARRAY_SIZE(heartbeat_resources),
+	.resource	= heartbeat_resources,
+};
+
+static struct platform_device *x3proto_devices[] __initdata = {
+	&heartbeat_device,
+};
+
+static int __init x3proto_devices_setup(void)
+{
+	return platform_add_devices(x3proto_devices,
+				    ARRAY_SIZE(x3proto_devices));
+}
+device_initcall(x3proto_devices_setup);
+
+static void __init x3proto_init_irq(void)
+{
+	plat_irq_setup_pins(IRQ_MODE_IRL3210);
+
+	/* Set ICR0.LVLMODE */
+	ctrl_outl(ctrl_inl(0xfe410000) | (1 << 21), 0xfe410000);
+}
+
+static struct sh_machine_vector mv_x3proto __initmv = {
+	.mv_name		= "x3proto",
+	.mv_init_irq		= x3proto_init_irq,
+};