Index: simplebus.c
===================================================================
--- simplebus.c	(revision 230313)
+++ simplebus.c	(working copy)
@@ -64,9 +64,6 @@
 struct simplebus_softc {
 	int	sc_addr_cells;
 	int	sc_size_cells;
-	u_long	sc_start_pa;
-	u_long	sc_start_va;
-	u_long	sc_size;
 };
 
 struct simplebus_devinfo {
@@ -158,10 +155,6 @@
 
 	sc = device_get_softc(dev);
 
-	sc->sc_start_pa = fdt_immr_pa;
-	sc->sc_start_va = fdt_immr_va;
-	sc->sc_size = fdt_immr_size;
-
 	/*
 	 * Walk simple-bus and add direct subordinates as our children.
 	 */
@@ -185,10 +178,11 @@
 		}
 
 		resource_list_init(&di->di_res);
-
-		if (fdt_reg_to_rl(dt_child, &di->di_res, sc->sc_start_va)) {
-			device_printf(dev, "%s: could not process 'reg' "
+		if (fdt_reg_to_rl(dt_child, &di->di_res)) {
+			device_printf(dev,
+			    "%s: could not process 'reg' "
 			    "property\n", di->di_ofw.obd_name);
+			/* XXX should unmap */
 			ofw_bus_gen_destroy_devinfo(&di->di_ofw);
 			free(di, M_SIMPLEBUS);
 			continue;
@@ -198,6 +192,7 @@
 			device_printf(dev, "%s: could not process "
 			    "'interrupts' property\n", di->di_ofw.obd_name);
 			resource_list_free(&di->di_res);
+			/* XXX should unmap */
 			ofw_bus_gen_destroy_devinfo(&di->di_ofw);
 			free(di, M_SIMPLEBUS);
 			continue;
@@ -209,6 +204,7 @@
 			device_printf(dev, "could not add child: %s\n",
 			    di->di_ofw.obd_name);
 			resource_list_free(&di->di_res);
+			/* XXX should unmap */
 			ofw_bus_gen_destroy_devinfo(&di->di_ofw);
 			free(di, M_SIMPLEBUS);
 			continue;
Index: fdt_common.c
===================================================================
--- fdt_common.c	(revision 230315)
+++ fdt_common.c	(working copy)
@@ -35,6 +35,7 @@
 #include <sys/kernel.h>
 #include <sys/module.h>
 #include <sys/bus.h>
+#include <sys/limits.h>
 
 #include <machine/fdt.h>
 #include <machine/resource.h>
@@ -81,6 +82,11 @@
 	len = OF_getproplen(node, "ranges");
 	if (len > sizeof(ranges))
 		return (ENOMEM);
+	if (len == 0) {
+		*base = 0;
+		*size = ULONG_MAX;
+		return (0);
+	}
 
 	if (!(range_id < len))
 		return (ERANGE);
@@ -413,16 +419,19 @@
 }
 
 int
-fdt_reg_to_rl(phandle_t node, struct resource_list *rl, u_long base)
+fdt_reg_to_rl(phandle_t node, struct resource_list *rl)
 {
 	u_long start, end, count;
 	pcell_t *reg, *regptr;
 	pcell_t addr_cells, size_cells;
 	int tuple_size, tuples;
 	int i, rv;
+	long vaddr;
+	long busaddr, bussize;
 
 	if (fdt_addrsize_cells(OF_parent(node), &addr_cells, &size_cells) != 0)
 		return (ENXIO);
+	fdt_get_range(OF_parent(node), 0, &busaddr, &bussize);
 
 	tuple_size = sizeof(pcell_t) * (addr_cells + size_cells);
 	tuples = OF_getprop_alloc(node, "reg", tuple_size, (void **)&reg);
@@ -444,14 +453,15 @@
 		reg += addr_cells + size_cells;
 
 		/* Calculate address range relative to base. */
-		start &= 0x000ffffful;
-		start = base + start;
-		end = start + count - 1;
+		start += busaddr;
+		if (bus_space_map(fdtbus_bs_tag, start, count, 0, &vaddr) != 0)
+			panic("Couldn't map the device memory");
+		end = vaddr + count - 1;
 
 		debugf("reg addr start = %lx, end = %lx, count = %lx\n", start,
 		    end, count);
 
-		resource_list_add(rl, SYS_RES_MEMORY, i, start, end,
+		resource_list_add(rl, SYS_RES_MEMORY, i, vaddr, end,
 		    count);
 	}
 	rv = 0;
Index: fdtbus.c
===================================================================
--- fdtbus.c	(revision 230313)
+++ fdtbus.c	(working copy)
@@ -293,7 +293,7 @@
 
 	resource_list_init(&di->di_res);
 
-	if (fdt_reg_to_rl(node, &di->di_res, fdt_immr_va)) {
+	if (fdt_reg_to_rl(node, &di->di_res)) {
 		device_printf(child, "could not process 'reg' property\n");
 		newbus_device_destroy(child);
 		child = NULL;
Index: fdt_common.h
===================================================================
--- fdt_common.h	(revision 230315)
+++ fdt_common.h	(working copy)
@@ -107,7 +107,7 @@
     struct fdt_pci_range *);
 int fdt_pci_route_intr(int, int, int, int, struct fdt_pci_intr *, int *);
 int fdt_ranges_verify(pcell_t *, int, int, int, int);
-int fdt_reg_to_rl(phandle_t, struct resource_list *, u_long);
+int fdt_reg_to_rl(phandle_t, struct resource_list *);
 int fdt_pm(phandle_t);
 
 #endif /* _FDT_COMMON_H_ */