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diff --git a/nuttx/include/nuttx/ramdisk.h b/nuttx/include/nuttx/ramdisk.h
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+++ b/nuttx/include/nuttx/ramdisk.h
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+/****************************************************************************
+ * include/nuttx/ramdisk.h
+ *
+ *   Copyright (C) 2008-2009, 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_NUTTX_RAMDISK_H
+#define __INCLUDE_NUTTX_RAMDISK_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Type Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Name: ramdisk_register or romdisk_register
+ *
+ * Description:
+ *   Non-standard function to register a ramdisk or a romdisk
+ *
+ * Input Parmeters:
+ *   minor:         Selects suffix of device named /dev/ramN, N={1,2,3...}
+ *   nsectors:      Number of sectors on device
+ *   sectize:       The size of one sector
+ *   writeenabled:  true: can write to ram disk
+ *   buffer:        RAM disk backup memory
+ *
+ * Returned Valued:
+ *   Zero on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_FS_WRITABLE
+EXTERN int ramdisk_register(int minor, FAR uint8_t *buffer, uint32_t nsectors,
+                            uint16_t sectize, bool writeenabled);
+#define romdisk_register(m,b,n,s) ramdisk_register(m,b,n,s,0)
+#else
+EXTERN int romdisk_register(int minor, FAR uint8_t *buffer, uint32_t nsectors,
+                            uint16_t sectize);
+#endif
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __INCLUDE_NUTTX_RAMDISK_H */