From 05fadfb5338aef16b84c7a4b5b9592eccb7e0ce0 Mon Sep 17 00:00:00 2001
From: Giovanni Di Sirio <gdisirio@gmail.com>
Date: Thu, 9 Jun 2016 17:26:22 +0000
Subject: [PATCH] git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@9612
 35acf78f-673a-0410-8e92-d51de3d6d3f4

---
 os/ex/subsystems/mfs/mfs.c | 27 +++++++++++++++++++++++++++
 os/ex/subsystems/mfs/mfs.h |  6 ++++++
 2 files changed, 33 insertions(+)

diff --git a/os/ex/subsystems/mfs/mfs.c b/os/ex/subsystems/mfs/mfs.c
index fe5960ad5..795fac5a1 100644
--- a/os/ex/subsystems/mfs/mfs.c
+++ b/os/ex/subsystems/mfs/mfs.c
@@ -49,6 +49,33 @@
 /* Driver local functions.                                                   */
 /*===========================================================================*/
 
+#if (MFS_CFG_ID_CACHE_SIZE > 0) || defined(__DOXYGEN__)
+void mfs_cache_init(MFSDriver *devp) {
+
+  (void)devp;
+}
+
+mfs_cached_id_t *mfs_cache_find_id(MFSDriver *devp, uint32_t id) {
+
+  (void)devp;
+  (void)id;
+
+  return NULL;
+}
+
+void mfs_cache_update_id(MFSDriver *devp, uint32_t id) {
+
+  (void)devp;
+  (void)id;
+}
+
+void mfs_cache_erase_id(MFSDriver *devp, uint32_t id) {
+
+  (void)devp;
+  (void)id;
+}
+#endif /* MFS_CFG_ID_CACHE_SIZE > 0 */
+
 /*===========================================================================*/
 /* Driver exported functions.                                                */
 /*===========================================================================*/
diff --git a/os/ex/subsystems/mfs/mfs.h b/os/ex/subsystems/mfs/mfs.h
index 79e1e1023..a6d215237 100644
--- a/os/ex/subsystems/mfs/mfs.h
+++ b/os/ex/subsystems/mfs/mfs.h
@@ -33,6 +33,10 @@
 /* Driver constants.                                                         */
 /*===========================================================================*/
 
+#define MFS_BANK_MAGIC_0                    0xEC705ADEU
+#define MFS_BANK_MAGIC_1                    0xF0339CC5U
+#define MFS_RECORD_MAGIC                    0x5FAEU
+
 /*===========================================================================*/
 /* Driver pre-compile time settings.                                         */
 /*===========================================================================*/
@@ -122,6 +126,8 @@ typedef struct {
   uint32_t                  magic2;
   /**
    * @brief   Usage counter of the bank.
+   * @details This value is increased each time a bank swap is performed. It
+   *          indicates how much wearing the flash has already endured.
    */
   uint32_t                  counter;
   /**