diff --git a/src/mainboard/leadtek/winfast6300/irq_tables.c b/src/mainboard/leadtek/winfast6300/irq_tables.c
index e2728ee586..6aa8ff6281 100644
--- a/src/mainboard/leadtek/winfast6300/irq_tables.c
+++ b/src/mainboard/leadtek/winfast6300/irq_tables.c
@@ -1,4 +1,6 @@
 #include <subr.h>
+
+#ifndef SIS630S
 #define CHECKSUM 0xe6
 const struct irq_routing_table intel_irq_routing_table = {
 	PIRQ_SIGNATURE,	/* u32 signature */
@@ -26,3 +28,37 @@ const struct irq_routing_table intel_irq_routing_table = {
 		 0x00, 0x00},
 	}
 };
+
+#else /* SIS630S */
+#define CHECKSUM 0x21
+const struct irq_routing_table intel_irq_routing_table = {
+	PIRQ_SIGNATURE,	/* u32 signature */
+	PIRQ_VERSION,	/* u16 version   */
+	32+16*7,	/* there can be total 5 devices on the bus */
+	0x00,		/* Bus 0 */
+	0x08,		/* Device 1, Function 0 */
+	0x1c20,		/* reserve IRQ 12, 11, 9, 5, for PCI */
+	0x1039,		/* Silicon Integrated System */
+	0x0008,		/* SiS 85C503/5513 ISA Bridge */
+	0x00,		/*  u8 miniport_data  - "crap" */
+	{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, /* u8 rfu[11] */
+	CHECKSUM,	/*  u8 checksum       - mod 256 checksum must give zero */
+	{
+		/* bus, devfn, {link, bitmap}, {link, bitmap}, {link, bitmap}, {link, bitmap}, slot, rfu  */
+		{0x00, 0x48, {{0x42, 0xdef8}, {0x43, 0xdef8}, {0x44, 0xdef8}, {0x41, 0xdef8}},
+		 0x01, 0x00},
+		{0x00, 0x58, {{0x43, 0xdef8}, {0x44, 0xdef8}, {0x41, 0xdef8}, {0x42, 0xdef8}},
+		 0x02, 0x00},
+		{0x00, 0x68, {{0x44, 0xdef8}, {0x41, 0xdef8}, {0x42, 0xdef8}, {0x43, 0xdef8}},
+		 0x03, 0x00},
+		{0x00, 0x78, {{0x41, 0xdef8}, {0x42, 0xdef8}, {0x43, 0xdef8}, {0x44, 0xdef8}},
+		 0x04, 0x00},
+		{0x00, 0x01, {{0x61, 0xdef8}, {0x00, 0xdef8}, {0x00, 0xdef8}, {0x00, 0xdef8}},
+		 0x00, 0x00},
+		{0x00, 0x10, {{0x41, 0xdef8}, {0x42, 0xdef8}, {0x43, 0xdef8}, {0x44, 0xdef8}},
+		 0x00, 0x00},
+		{0x00, 0x0a, {{0x41, 0xdef8}, {0x42, 0xdef8}, {0x43, 0xdef8}, {0x44, 0xdef8}},
+		 0x00, 0x00},
+	}
+};
+#endif /* SIS630S */