diff --git a/src/mainboard/rca/rm4100/Options.lb b/src/mainboard/rca/rm4100/Options.lb
index 8bc784bf98..95f7e211c4 100644
--- a/src/mainboard/rca/rm4100/Options.lb
+++ b/src/mainboard/rca/rm4100/Options.lb
@@ -69,7 +69,7 @@ default FALLBACK_SIZE = 512 * 1024
 default CONFIG_UDELAY_TSC = 1
 default CONFIG_TSC_X86RDTSC_CALIBRATE_WITH_TIMER2 = 1
 default HAVE_PIRQ_TABLE = 1
-default IRQ_SLOT_COUNT = 10
+default IRQ_SLOT_COUNT = 7
 default HAVE_MP_TABLE = 0
 default HAVE_ACPI_TABLES = 0
 default CONFIG_IOAPIC = 0
diff --git a/src/mainboard/rca/rm4100/irq_tables.c b/src/mainboard/rca/rm4100/irq_tables.c
index 84b57eb882..d1b0b952af 100644
--- a/src/mainboard/rca/rm4100/irq_tables.c
+++ b/src/mainboard/rca/rm4100/irq_tables.c
@@ -23,7 +23,7 @@
 const struct irq_routing_table intel_irq_routing_table = {
 	PIRQ_SIGNATURE,  /* u32 signature */
 	PIRQ_VERSION,    /* u16 version   */
-	32+16*IRQ_SLOT_COUNT,	 /* there can be total 10 devices on the bus */
+	32+16*IRQ_SLOT_COUNT,	 /* there can be total 7 devices on the bus */
 	0x00,		 /* Where the interrupt router lies (bus) */
 	(0x1f<<3)|0x0,   /* Where the interrupt router lies (dev) */
 	0,		 /* IRQs devoted exclusively to PCI usage */
@@ -31,19 +31,16 @@ const struct irq_routing_table intel_irq_routing_table = {
 	0x24c0,		 /* Device */
 	0,		 /* Crap (miniport) */
 	{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, /* u8 rfu[11] */
-	0x14,         /*  u8 checksum , this hase to set to some value that would give 0 after the sum of all bytes for this structure (including checksum) */
+	0xcd,         /*  u8 checksum , this hase to set to some value that would give 0 after the sum of all bytes for this structure (including checksum) */
 	{
 		/* bus,     dev|fn,   {link, bitmap}, {link, bitmap}, {link, bitmap}, {link, bitmap},  slot, rfu */
-		{0x00,(0x1d<<3)|0x0, {{0x60, 0x1ef8}, {0x61, 0x1ef8}, {0x62, 0x1ef8}, {0x63, 0x01ef8}}, 0x0, 0x0}, /* [A] USB UHCI Controller #1 */
-		{0x00,(0x1d<<3)|0x1, {{0x61, 0x1ef8}, {0x62, 0x1ef8}, {0x63, 0x1ef8}, {0x60, 0x01ef8}}, 0x0, 0x0}, /* [B] USB UHCI Controller #2 */
-		{0x00,(0x1d<<3)|0x2, {{0x62, 0x1ef8}, {0x63, 0x1ef8}, {0x60, 0x1ef8}, {0x61, 0x01ef8}}, 0x0, 0x0}, /* [C] USB UHCI Controller #3 */
-		{0x00,(0x1d<<3)|0x7, {{0x63, 0x1ef8}, {0x60, 0x1ef8}, {0x61, 0x1ef8}, {0x62, 0x01ef8}}, 0x0, 0x0}, /* [D] USB2 EHCI Controller */
-		{0x00,(0x1f<<3)|0x1, {{0x60, 0x1ef8}, {0x61, 0x1ef8}, {0x62, 0x1ef8}, {0x63, 0x01ef8}}, 0x0, 0x0}, /* [A] IDE Controller */
-		{0x00,(0x1f<<3)|0x3, {{0x61, 0x1ef8}, {0x62, 0x1ef8}, {0x63, 0x1ef8}, {0x60, 0x01ef8}}, 0x0, 0x0}, /* [B] SMBus Controller */
-		{0x00,(0x02<<3)|0x0, {{0x60, 0x1ef8}, {0x61, 0x1ef8}, {0x62, 0x1ef8}, {0x63, 0x01ef8}}, 0x0, 0x0}, /* [A] VGA compatible controller */
-		{0x00,(0x1f<<3)|0x5, {{0x61, 0x1ef8}, {0x62, 0x1ef8}, {0x63, 0x1ef8}, {0x60, 0x01ef8}}, 0x0, 0x0}, /* [B] AC'97 Audio Controller */
+		{0x00,(0x02<<3)|0x0, {{0x60, 0x1ef8}, {0x00, 0x0000}, {0x00, 0x0000}, {0x00, 0x00000}}, 0x0, 0x0}, /* [A] VGA compatible controller */
+		{0x00,(0x1d<<3)|0x0, {{0x60, 0x1ef8}, {0x63, 0x1ef8}, {0x62, 0x1ef8}, {0x6b, 0x01ef8}}, 0x0, 0x0}, /* [D] USB2 EHCI Controller */
+		{0x00,(0x1f<<3)|0x0, {{0x62, 0x1ef8}, {0x61, 0x1ef8}, {0x6b, 0x1ef8}, {0x63, 0x01ef8}}, 0x0, 0x0}, /* [A] IDE Controller */
 		{0x01,(0x08<<3)|0x0, {{0x68, 0x1ef8}, {0x00, 0x0000}, {0x00, 0x0000}, {0x00, 0x00000}}, 0x0, 0x0}, /* [A] Ethernet controller */
-		{0x00,(0x1f<<3)|0x6, {{0x61, 0x1ef8}, {0x62, 0x1ef8}, {0x63, 0x1ef8}, {0x64, 0x01ef8}}, 0x0, 0x0}, /* [B] AC'97 Modem Controller */
+		{0x01,(0x00<<3)|0x0, {{0x60, 0x1ef8}, {0x61, 0x1ef8}, {0x62, 0x1ef8}, {0x63, 0x01ef8}}, 0x1, 0x0}, /* [A] USB UHCI Controller #1 */
+		{0x01,(0x01<<3)|0x0, {{0x63, 0x1ef8}, {0x60, 0x1ef8}, {0x61, 0x1ef8}, {0x62, 0x01ef8}}, 0x2, 0x0}, /* [B] USB UHCI Controller #2 */
+		{0x01,(0x02<<3)|0x0, {{0x62, 0x1ef8}, {0x63, 0x1ef8}, {0x60, 0x1ef8}, {0x61, 0x01ef8}}, 0x3, 0x0}, /* [C] USB UHCI Controller #3 */
 	}
 };