new file mode 100644
--- /dev/null
+++ b/packages/io/common/current/include/devtab.h
@@ -0,0 +1,113 @@
+#ifndef CYGONCE_IO_DEVTAB_H
+#define CYGONCE_IO_DEVTAB_H
+// ====================================================================
+//
+//      devtab.h
+//
+//      Device I/O Table
+//
+// ====================================================================
+//####COPYRIGHTBEGIN####
+//
+// -------------------------------------------
+// The contents of this file are subject to the Cygnus eCos Public License
+// Version 1.0 (the "License"); you may not use this file except in
+// compliance with the License.  You may obtain a copy of the License at
+// http://sourceware.cygnus.com/ecos
+// 
+// Software distributed under the License is distributed on an "AS IS"
+// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the
+// License for the specific language governing rights and limitations under
+// the License.
+// 
+// The Original Code is eCos - Embedded Cygnus Operating System, released
+// September 30, 1998.
+// 
+// The Initial Developer of the Original Code is Cygnus.  Portions created
+// by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions.  All Rights Reserved.
+// -------------------------------------------
+//
+//####COPYRIGHTEND####
+// ====================================================================
+//#####DESCRIPTIONBEGIN####
+//
+// Author(s):   gthomas
+// Contributors:        gthomas
+// Date:        1999-02-04
+// Purpose:     Describe low level I/O interfaces.
+// Description:
+//
+//####DESCRIPTIONEND####
+//
+// ====================================================================
+
+// Private include file.  This file should only be used by device 
+// drivers, not application code.
+
+#include <pkgconf/system.h>
+#include <cyg/io/io.h>
+#include <cyg/hal/drv_api.h>
+
+// Set of functions which handle top level I/O functions
+typedef struct {
+    Cyg_ErrNo (*write)(cyg_io_handle_t handle, 
+                       const void *buf, 
+                       cyg_uint32 *len);
+    Cyg_ErrNo (*read)(cyg_io_handle_t handle, 
+                      void *buf, 
+                      cyg_uint32 *len);
+    Cyg_ErrNo (*get_config)(cyg_io_handle_t handle, 
+                            cyg_uint32 key, 
+                            void *buf, 
+                            cyg_uint32 *len);
+    Cyg_ErrNo (*set_config)(cyg_io_handle_t handle, 
+                            cyg_uint32 key, 
+                            const void *buf, 
+                            cyg_uint32 *len);
+} cyg_devio_table_t;
+
+#define DEVIO_TABLE(_l,_write,_read,_get_config,_set_config)    \
+cyg_devio_table_t _l = {                                        \
+    _write,                                                     \
+    _read,                                                      \
+    _get_config,                                                \
+    _set_config,                                                \
+};
+
+typedef struct cyg_devtab_entry {
+    const char        *name;
+    const char        *dep_name;
+    cyg_devio_table_t *handlers;
+    bool             (*init)(struct cyg_devtab_entry *tab);
+    Cyg_ErrNo        (*lookup)(struct cyg_devtab_entry **tab, 
+                               struct cyg_devtab_entry *sub_tab,
+                               const char *name);
+    void              *priv;
+    unsigned long     status;
+} cyg_devtab_entry_t;
+
+#define CYG_DEVTAB_STATUS_AVAIL   0x0001
+
+extern cyg_devtab_entry_t __DEVTAB__[], __DEVTAB_END__;
+
+#define DEVTAB_ENTRY(_l,_name,_dep_name,_handlers,_init,_lookup,_priv)  \
+cyg_devtab_entry_t _l __attribute__ ((section(".devtab"))) = {          \
+   _name,                                                               \
+   _dep_name,                                                           \
+   _handlers,                                                           \
+   _init,                                                               \
+   _lookup,                                                             \
+   _priv                                                                \
+};
+
+#define DEVTAB_ENTRY_NO_INIT(_l,_name,_dep_name,_handlers,_init,_lookup,_priv)  \
+cyg_devtab_entry_t _l = {                                                       \
+   _name,                                                                       \
+   _dep_name,                                                                   \
+   _handlers,                                                                   \
+   _init,                                                                       \
+   _lookup,                                                                     \
+   _priv                                                                        \
+};
+
+#endif // CYGONCE_IO_DEVTAB_H