diff --git a/arch b/arch
index e6fdf9eb6a..a26ed33fa4 160000
--- a/arch
+++ b/arch
@@ -1 +1 @@
-Subproject commit e6fdf9eb6a1e288e90a12eb3ee70a393ea30bec3
+Subproject commit a26ed33fa4c164564b45b4f0905887fcf553f425
diff --git a/include/nuttx/fs/ioctl.h b/include/nuttx/fs/ioctl.h
index f047d38906..827f62e4c5 100644
--- a/include/nuttx/fs/ioctl.h
+++ b/include/nuttx/fs/ioctl.h
@@ -217,25 +217,6 @@
 #define _MTDIOCVALID(c)   (_IOC_TYPE(c)==_MTDIOCBASE)
 #define _MTDIOC(nr)       _IOC(_MTDIOCBASE,nr)
 
-#define MTDIOC_GEOMETRY   _MTDIOC(0x0001) /* IN:  Pointer to write-able struct
-                                           *      mtd_geometry_s in which to receive
-                                           *      receive geometry data (see mtd.h)
-                                           * OUT: Geometry structure is populated
-                                           *      with data for the MTD */
-#define MTDIOC_XIPBASE    _MTDIOC(0x0002) /* IN:  Pointer to pointer to void in
-                                           *      which to received the XIP base.
-                                           * OUT: If media is directly accessible,
-                                           *      return (void*) base address
-                                           *      of device memory */
-#define MTDIOC_BULKERASE  _MTDIOC(0x0003) /* IN:  None
-                                           * OUT: None */
-#define MTDIOC_SETSPEED   _MTDIOC(0x0004) /* IN:  New bus speed in Hz
-                                           * OUT: None */
-#define MTDIOC_EXTENDED   _MTDIOC(0x0005) /* IN:  unsigned long
-                                           *      0=Use normal memory region
-                                           *      1=Use alternate/extended memory
-                                           * OUT: None */
-
 /* NuttX ARP driver ioctl definitions (see netinet/arp.h) *******************/
 
 #define _ARPIOCVALID(c)   (_IOC_TYPE(c)==_ARPIOCBASE)
diff --git a/include/nuttx/mtd/mtd.h b/include/nuttx/mtd/mtd.h
index 4162cde6f9..e9e4060ae6 100644
--- a/include/nuttx/mtd/mtd.h
+++ b/include/nuttx/mtd/mtd.h
@@ -49,6 +49,34 @@
 /****************************************************************************
  * Pre-processor Definitions
  ****************************************************************************/
+/* Ioctl commands */
+
+#define MTDIOC_GEOMETRY   _MTDIOC(0x0001) /* IN:  Pointer to write-able struct
+                                           *      mtd_geometry_s in which to receive
+                                           *      receive geometry data (see mtd.h)
+                                           * OUT: Geometry structure is populated
+                                           *      with data for the MTD */
+#define MTDIOC_XIPBASE    _MTDIOC(0x0002) /* IN:  Pointer to pointer to void in
+                                           *      which to received the XIP base.
+                                           * OUT: If media is directly accessible,
+                                           *      return (void*) base address
+                                           *      of device memory */
+#define MTDIOC_BULKERASE  _MTDIOC(0x0003) /* IN:  None
+                                           * OUT: None */
+#define MTDIOC_PROTECT    _MTDIOC(0x0004) /* IN:  Pointer to read-able struct
+                                           *      mtd_protects_s that provides
+                                           *      the region to protect.
+                                           * OUT: None */
+#define MTDIOC_UNPROTECT  _MTDIOC(0x0005) /* IN:  Pointer to read-able struct
+                                           *      mtd_protects_s that provides
+                                           *      the region to un-protect.
+                                           * OUT: None */
+#define MTDIOC_SETSPEED   _MTDIOC(0x0006) /* IN:  New bus speed in Hz
+                                           * OUT: None */
+#define MTDIOC_EXTENDED   _MTDIOC(0x0007) /* IN:  unsigned long
+                                           *      0=Use normal memory region
+                                           *      1=Use alternate/extended memory
+                                           * OUT: None */
 
 /* Macros to hide implementation */
 
@@ -90,6 +118,16 @@ struct mtd_geometry_s
   uint32_t neraseblocks;  /* Number of erase blocks */
 };
 
+/* This structure describes a range of sectors to be protected or
+ * unprotected.
+ */
+
+struct mtd_protect_s
+{
+  off_t  startblock;      /* First block to be [un-]protected */
+  size_t nblocks;         /* Number of blocks to [un-]protect */
+};
+
 /* The following defines the information for writing bytes to a sector
  * that are not a full page write (bytewrite).
  */