diff --git a/sys/dev/fdt/fdt_common.h b/sys/dev/fdt/fdt_common.h
--- a/sys/dev/fdt/fdt_common.h
+++ b/sys/dev/fdt/fdt_common.h
@@ -76,11 +76,14 @@
 
 SYSCTL_DECL(_hw_fdt);
 
+typedef void (*fdt_mem_region_cb)(const struct mem_region *, void *);
+
 int fdt_addrsize_cells(phandle_t, int *, int *);
 u_long fdt_data_get(void *, int);
 int fdt_data_to_res(pcell_t *, int, int, u_long *, u_long *);
 phandle_t fdt_find_compatible(phandle_t, const char *, int);
 phandle_t fdt_depth_search_compatible(phandle_t, const char *, int);
+int fdt_foreach_mem_region(fdt_mem_region_cb, void *);
 int fdt_get_mem_regions(struct mem_region *, int *, uint64_t *);
 int fdt_get_reserved_mem(struct mem_region *, int *);
 int fdt_get_reserved_regions(struct mem_region *, int *);
diff --git a/sys/dev/fdt/fdt_common.c b/sys/dev/fdt/fdt_common.c
--- a/sys/dev/fdt/fdt_common.c
+++ b/sys/dev/fdt/fdt_common.c
@@ -540,6 +540,53 @@
 	return (0);
 }
 
+int
+fdt_foreach_mem_region(fdt_mem_region_cb cb, void *arg)
+{
+	struct mem_region mr;
+	pcell_t reg[FDT_REG_CELLS * FDT_MEM_REGIONS];
+	pcell_t *regp;
+	phandle_t memory;
+	int addr_cells, size_cells;
+	int i, reg_len, rv, tuple_size, tuples;
+
+	memory = OF_finddevice("/memory");
+	if (memory == -1)
+		return (ENXIO);
+
+	if ((rv = fdt_addrsize_cells(OF_parent(memory), &addr_cells,
+	    &size_cells)) != 0)
+		return (rv);
+
+	if (addr_cells > 2)
+		return (ERANGE);
+
+	tuple_size = sizeof(pcell_t) * (addr_cells + size_cells);
+	reg_len = OF_getproplen(memory, "reg");
+	if (reg_len <= 0 || reg_len > sizeof(reg))
+		return (ERANGE);
+
+	if (OF_getprop(memory, "reg", reg, reg_len) <= 0)
+		return (ENXIO);
+
+	tuples = reg_len / tuple_size;
+	regp = (pcell_t *)&reg;
+	for (i = 0; i < tuples; i++) {
+
+		rv = fdt_data_to_res(regp, addr_cells, size_cells,
+			(u_long *)&mr.mr_start, (u_long *)&mr.mr_size);
+
+		if (rv != 0)
+			return (rv);
+
+		cb(&mr, arg);
+
+		regp += addr_cells + size_cells;
+	}
+
+	return (0);
+}
+
 int
 fdt_get_mem_regions(struct mem_region *mr, int *mrcnt, uint64_t *memsize)
 {