Index: sys/dev/hptiop/hptiop.c
===================================================================
--- sys/dev/hptiop/hptiop.c	(revision 224900)
+++ sys/dev/hptiop/hptiop.c	(working copy)
@@ -495,8 +495,12 @@ static void hptiop_drain_outbound_queue_itl(struct
 static int hptiop_intr_itl(struct hpt_iop_hba * hba)
 {
 	u_int32_t status;
+	void *plx = hba->u.itl.plx;
 	int ret = 0;
 
+	if (plx != NULL && bus_space_read_4(hba->bar2t, hba->bar2h, 0x11C5C) & 0xf)
+		bus_space_write_4(hba->bar2t, hba->bar2h, 0x11C60, 1);
+
 	status = BUS_SPACE_RD4_ITL(outbound_intstatus);
 
 	if (status & IOPMU_OUTBOUND_INT_MSG0) {
@@ -1052,7 +1056,8 @@ static  bus_dmamap_callback_t   hptiop_mv_map_ctlc
 
 static int hptiop_alloc_pci_res_itl(struct hpt_iop_hba *hba)
 {
-	hba->bar0_rid = 0x10;
+	u_int32_t id;
+	hba->bar0_rid = PCIR_BAR(0);
 	hba->bar0_res = bus_alloc_resource_any(hba->pcidev,
 			SYS_RES_MEMORY, &hba->bar0_rid, RF_ACTIVE);
 
@@ -1066,13 +1071,52 @@ static int hptiop_alloc_pci_res_itl(struct hpt_iop
 	hba->u.itl.mu = (struct hpt_iopmu_itl *)
 				rman_get_virtual(hba->bar0_res);
 
-	if (!hba->u.itl.mu) {
+	if (hba->u.itl.mu == NULL) {
 		bus_release_resource(hba->pcidev, SYS_RES_MEMORY,
 					hba->bar0_rid, hba->bar0_res);
 		device_printf(hba->pcidev, "alloc mem res failed\n");
 		return -1;
 	}
 
+	/* Special case for 44xx series */
+	id = pci_get_device(hba->pcidev);
+	if ((id & 0xff00) == 0x4400) {
+		/*
+		 * On 44xx, BAR2 acts as BAR0 of other ITL devices.
+		 * In order to reuse the code, we use bar0* to hold
+		 * BAR2 resources and vice versa.
+		 */
+		hba->bar2_rid = hba->bar0_rid;
+		hba->bar2_res = hba->bar0_res;
+		hba->bar2t = hba->bar0t;
+		hba->bar2h = hba->bar0h;
+
+		hba->bar0_rid = PCIR_BAR(2);
+		hba->bar0_res = bus_alloc_resource_any(hba->pcidev,
+				SYS_RES_MEMORY, &hba->bar0_rid, RF_ACTIVE);
+		if (hba->bar0_res == NULL) {
+			bus_release_resource(hba->pcidev, SYS_RES_MEMORY,
+						hba->bar2_rid, hba->bar2_res);
+			device_printf(hba->pcidev, "failed to get iop bar2.\n");
+			return -1;
+		}
+
+		hba->bar0t = rman_get_bustag(hba->bar0_res);
+		hba->bar0h = rman_get_bushandle(hba->bar0_res);
+
+		hba->u.itl.plx = hba->u.itl.mu;
+		hba->u.itl.mu = (struct hpt_iopmu_itl *)
+				rman_get_virtual(hba->bar0_res);
+		if (hba->u.itl.mu == NULL) {
+			bus_release_resource(hba->pcidev, SYS_RES_MEMORY,
+						hba->bar0_rid, hba->bar0_res);
+			bus_release_resource(hba->pcidev, SYS_RES_MEMORY,
+						hba->bar2_rid, hba->bar2_res);
+			device_printf(hba->pcidev, "alloc mem res failed\n");
+			return -1;
+		}
+	}
+
 	return 0;
 }
 
@@ -1130,6 +1174,9 @@ static void hptiop_release_pci_res_itl(struct hpt_
 	if (hba->bar0_res)
 		bus_release_resource(hba->pcidev, SYS_RES_MEMORY,
 			hba->bar0_rid, hba->bar0_res);
+	if (hba->bar2_res)
+		bus_release_resource(hba->pcidev, SYS_RES_MEMORY,
+			hba->bar2_rid, hba->bar2_res);
 }
 
 static void hptiop_release_pci_res_mv(struct hpt_iop_hba *hba)
@@ -1269,24 +1316,31 @@ static int hptiop_probe(device_t dev)
 	id = pci_get_device(dev);
 
 	switch (id) {
+		case 0x4210:
+		case 0x4211:
+		case 0x4310:
+		case 0x4311:
+		case 0x4320:
+		case 0x4321:
 		case 0x4322:
-		case 0x4321:
-		case 0x4320:
+		case 0x4400:
 			sas = 1;
 		case 0x3220:
 		case 0x3320:
 		case 0x3410:
-		case 0x3520:
 		case 0x3510:
 		case 0x3511:
+		case 0x3520:
 		case 0x3521:
 		case 0x3522:
+		case 0x3530:
 		case 0x3540:
+		case 0x3560:
 			ops = &hptiop_itl_ops;
 			break;
+		case 0x3020:
 		case 0x3120:
 		case 0x3122:
-		case 0x3020:
 			ops = &hptiop_mv_ops;
 			break;
 		default:
Index: sys/dev/hptiop/hptiop.h
===================================================================
--- sys/dev/hptiop/hptiop.h	(revision 224900)
+++ sys/dev/hptiop/hptiop.h	(working copy)
@@ -282,6 +282,7 @@ struct hpt_iop_hba {
 	union {
 		struct {
 			struct hpt_iopmu_itl *mu;
+			void *plx;
 		} itl;
 		struct {
 			struct hpt_iopmv_regs *regs;