diff --git a/drivers/devicetree/fdt_pci.c b/drivers/devicetree/fdt_pci.c
index 44ebcb27812..96ce7140958 100644
--- a/drivers/devicetree/fdt_pci.c
+++ b/drivers/devicetree/fdt_pci.c
@@ -118,22 +118,26 @@ int fdt_pci_ecam_register(FAR const void *fdt)
 
       if ((type & FDT_PCI_TYPE_MASK) == FDT_PCI_TYPE_IO)
         {
-          io.start = fdt_ld_by_cells(ranges + na, pna);
+          io.start = fdt_ld_by_cells(ranges + 1, na -1);
           io.end = io.start + fdt_ld_by_cells(ranges + na + pna, ns);
+          io.offset = fdt_ld_by_cells(ranges + na, pna) - io.start;
         }
       else if ((type & FDT_PCI_PREFTCH) == FDT_PCI_PREFTCH)
         {
-          prefetch.start = fdt_ld_by_cells(ranges + na, pna);
+          prefetch.start = fdt_ld_by_cells(ranges + 1, na - 1);
           prefetch.end = prefetch.start +
                          fdt_ld_by_cells(ranges + na + pna, ns);
+          prefetch.offset = fdt_ld_by_cells(ranges + na, pna) -
+                            prefetch.start;
         }
       else if (((type & FDT_PCI_TYPE_MEM32) == FDT_PCI_TYPE_MEM32 &&
                 sizeof(uintptr_t) == 4) ||
                ((type & FDT_PCI_TYPE_MEM64) == FDT_PCI_TYPE_MEM64 &&
                 sizeof(uintptr_t) == 8))
         {
-          mem.start = fdt_ld_by_cells(ranges + na, pna);
+          mem.start = fdt_ld_by_cells(ranges + 1, na - 1);
           mem.end = mem.start + fdt_ld_by_cells(ranges + na + pna, ns);
+          mem.offset = fdt_ld_by_cells(ranges + na, pna) - mem.start;
         }
     }
 
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 6f2714dfa2a..869a8d797a4 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -672,14 +672,19 @@ static uint32_t pci_size(uint32_t base, uint32_t maxbase, uint32_t mask)
  *   prefetchable MEM, and add this dev to the device list.
  *
  * Input Parameters:
- *   dev     - The PCI device be found
- *   max_bar - Max bar number(6 or 2)
+ *   dev      - The PCI device be found
+ *   max_bar  - Max bar number(6 or 2)
  *   rom_addr - The pci device rom addr
+ *   io       - The pci bus io resource
+ *   mem      - The pci bus mem resource
+ *   mem_pref - The pci bus mem_pref resource
  *
  ****************************************************************************/
 
 static void pci_setup_device(FAR struct pci_device_s *dev, int max_bar,
-                             uint8_t rom_addr)
+                             uint8_t rom_addr, FAR struct pci_resource_s *io,
+                             FAR struct pci_resource_s *mem,
+                             FAR struct pci_resource_s *mem_pref)
 {
   int bar;
   uint32_t orig;
@@ -720,7 +725,7 @@ static void pci_setup_device(FAR struct pci_device_s *dev, int max_bar,
 
           size  = pci_size(orig, mask, 0xfffffffe);
           flags = PCI_RESOURCE_IO;
-          res   = &dev->bus->ctrl->io;
+          res   = io;
         }
       else if ((mask & PCI_BASE_ADDRESS_MEM_PREFETCH) &&
                pci_resource_size(&dev->bus->ctrl->mem_pref))
@@ -729,7 +734,7 @@ static void pci_setup_device(FAR struct pci_device_s *dev, int max_bar,
 
           size  = pci_size(orig, mask, 0xfffffff0);
           flags = PCI_RESOURCE_MEM | PCI_RESOURCE_PREFETCH;
-          res   = &dev->bus->ctrl->mem_pref;
+          res   = mem_pref;
         }
       else
         {
@@ -737,7 +742,7 @@ static void pci_setup_device(FAR struct pci_device_s *dev, int max_bar,
 
           size  = pci_size(orig, mask, 0xfffffff0);
           flags = PCI_RESOURCE_MEM;
-          res   = &dev->bus->ctrl->mem;
+          res   = mem;
         }
 
       if (size == 0)
@@ -963,6 +968,9 @@ static void pci_scan_bus(FAR struct pci_bus_s *bus)
 {
   FAR struct pci_device_s *dev;
   FAR struct pci_bus_s *child_bus;
+  struct pci_resource_s mem_pref;
+  struct pci_resource_s mem;
+  struct pci_resource_s io;
   unsigned int devfn;
   uint32_t l;
   uint32_t class;
@@ -971,6 +979,10 @@ static void pci_scan_bus(FAR struct pci_bus_s *bus)
 
   pciinfo("pci_scan_bus for bus %d\n", bus->number);
 
+  memcpy(&io, &bus->ctrl->io, sizeof(struct pci_resource_s));
+  memcpy(&mem, &bus->ctrl->mem, sizeof(struct pci_resource_s));
+  memcpy(&mem_pref, &bus->ctrl->mem_pref, sizeof(struct pci_resource_s));
+
   for (devfn = 0; devfn < 0xff; ++devfn)
     {
       if (PCI_FUNC(devfn) && !is_multi)
@@ -1027,7 +1039,7 @@ static void pci_scan_bus(FAR struct pci_bus_s *bus)
               goto bad;
             }
 
-          pci_setup_device(dev, 6, PCI_ROM_ADDRESS);
+          pci_setup_device(dev, 6, PCI_ROM_ADDRESS, &io, &mem, &mem_pref);
 
           pci_read_config_word(dev, PCI_SUBSYSTEM_ID,
                                &dev->subsystem_device);
@@ -1056,7 +1068,7 @@ static void pci_scan_bus(FAR struct pci_bus_s *bus)
           pci_scan_bus(child_bus);
           pci_postsetup_bridge(dev);
 
-          pci_setup_device(dev, 2, PCI_ROM_ADDRESS1);
+          pci_setup_device(dev, 2, PCI_ROM_ADDRESS1, &io, &mem, &mem_pref);
           break;
 
         default:
diff --git a/drivers/pci/pci_ecam.c b/drivers/pci/pci_ecam.c
index 31929fc36aa..011e2c0d027 100644
--- a/drivers/pci/pci_ecam.c
+++ b/drivers/pci/pci_ecam.c
@@ -65,6 +65,8 @@ static int pci_ecam_write_io(FAR struct pci_bus_s *bus, uintptr_t addr,
 static int pci_ecam_get_irq(FAR struct pci_bus_s *bus, uint32_t devfn,
                             uint8_t line, uint8_t pin);
 
+static uintptr_t pci_ecam_map(FAR struct pci_bus_s *bus, uintptr_t start,
+                              uintptr_t end);
 #ifdef CONFIG_PCI_MSIX
 static int pci_ecam_alloc_irq(FAR struct pci_bus_s *bus, uint32_t devfn,
                               FAR int *irq, int num);
@@ -98,6 +100,7 @@ static const struct pci_ops_s g_pci_ecam_ops =
   .read_io     = pci_ecam_read_io,
   .write_io    = pci_ecam_write_io,
   .get_irq     = pci_ecam_get_irq,
+  .map         = pci_ecam_map,
 #ifdef CONFIG_PCI_MSIX
   .alloc_irq   = pci_ecam_alloc_irq,
   .release_irq = pci_ecam_release_irq,
@@ -436,6 +439,45 @@ static int pci_ecam_get_irq(FAR struct pci_bus_s *bus, uint32_t devfn,
   return up_get_legacy_irq(devfn, line, pin);
 }
 
+/****************************************************************************
+ * Name: pci_ecam_map
+ *
+ * Description:
+ *  Map pci addr to cpu addr.
+ *
+ * Input Parameters:
+ *   bus   - Bus that PCI device resides
+ *   start - The pci device start pci addr
+ *   end   - The pci device end pci addr
+ *
+ * Returned Value:
+ *   Return pci device cpu addr
+ *
+ ****************************************************************************/
+
+static uintptr_t pci_ecam_map(FAR struct pci_bus_s *bus, uintptr_t start,
+                              uintptr_t end)
+{
+  FAR struct pci_controller_s *ctrl = bus->ctrl;
+
+  if (start >= ctrl->io.start && end < ctrl->io.end)
+    {
+      return start + ctrl->io.offset;
+    }
+
+  if (start >= ctrl->mem.start && end < ctrl->mem.end)
+    {
+      return start + ctrl->mem.offset;
+    }
+
+  if (start >= ctrl->mem_pref.start && end < ctrl->mem_pref.end)
+    {
+      return start + ctrl->mem_pref.offset;
+    }
+
+  return 0;
+}
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
diff --git a/include/nuttx/pci/pci.h b/include/nuttx/pci/pci.h
index f1f19442880..07929342f22 100644
--- a/include/nuttx/pci/pci.h
+++ b/include/nuttx/pci/pci.h
@@ -238,6 +238,7 @@ struct pci_resource_s
 {
   uintptr_t start;
   uintptr_t end;
+  uintptr_t offset;
   unsigned int flags;
 };