Add FTL logic

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2307 42af7a65-404d-4744-a932-0658087f49c3

ChangeLog

@@ -985,4 +985,9 @@
 	* arch/hc: Adding framework to support m68hc11/12
 	* configs/demo9s12ne64: Configuration to support Freescale DEMO9S12NE64
 	  development board (MC9S12NE64 m68hcs12 processor).
+	* drivers/mtd/ftl.c - A FLASH translation layer (FTL) has been implemented.
+	  This layer will convert a FLASH MTD interface into a block driver that
+	  can be used with any file system.  Good performance of this layer will
+	  depend upon functioning write buffer support!
+	  NOTE: FTL support is untested as of the initial check-in.
 

Documentation/NuttX.html

@@ -8,7 +8,7 @@
   <tr align="center" bgcolor="#e4e4e4">
     <td>
       <h1><big><font color="#3c34ec"><i>NuttX RTOS</i></font></big></h1>
-      <p>Last Updated: December 3, 2009</p>
+      <p>Last Updated: December 5 2009</p>
     </td>
   </tr>
 </table>
@@ -1611,6 +1611,11 @@ nuttx-2010.1 2010-xx-xx Gregory Nutt &lt;spudmonkey@racsa.co.cr&gt;
 	* arch/hc: Adding framework to support m68hc11/12
 	* configs/demo9s12ne64: Configuration to support Freescale DEMO9S12NE64
 	  development board (MC9S12NE64 m68hcs12 processor).
+	* drivers/mtd/ftl.c - A FLASH translation layer (FTL) has been implemented.
+	  This layer will convert a FLASH MTD interface into a block driver that
+	  can be used with any file system.  Good performance of this layer will
+	  depend upon functioning write buffer support!
+	  NOTE: FTL support is untested as of the initial check-in.
 
 pascal-2010.1 2010-xx-xx Gregory Nutt &lt;spudmonkey@racsa.co.cr&gt;
 

TODO

@@ -1,4 +1,4 @@
-NuttX TODO List (Last updated November 29, 2009)
+NuttX TODO List (Last updated December 5, 2009)
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
   (5)  Task/Scheduler (sched/)
@@ -11,7 +11,7 @@ NuttX TODO List (Last updated November 29, 2009)
   (4)  Network Utilities (netutils/)
   (1)  USB (drivers/usbdev)
   (5)  Libraries (lib/)
-  (8)  File system/Generic drivers (fs/, drivers/)
+ (11)  File system/Generic drivers (fs/, drivers/)
   (2)  Graphics subystem (graphics/)
   (1)  Pascal add-on (pcode/)
   (1)  Documentation (Documentation/)
@@ -359,6 +359,25 @@ o File system / Generic drivers (fs/, drivers/)
   Status:      Open
   Priority:    Low
 
+  Description: Block driver read-ahead buffer and write buffer support is
+               implemented but not yet tested.
+  Status:      Open
+  Priority:    Low
+
+  Description: The drivers/mmcsd/mmcsd_sdio.c driver has hooks in place to
+               support read-ahead buffering and write buffering, but the logic
+               is incomplete and untested.
+  Status:      Open
+  Priority:    Low
+
+  Description: A FLASH translation layer (FTL) has been implemented at
+               drivers/mtd/ftl.c but has not yet been tested.  This layer
+               will convert a FLASH MTD interface into a block driver that
+               can be used with any file system.  Good performance of this
+               layer will depend upon functioning write buffer support!
+  Status:      Open
+  Priority:    Low
+
 o Graphics subystem (graphics/)
   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 

drivers/mtd/Make.defs

@@ -34,5 +34,5 @@
 ############################################################################
 
 MTD_ASRCS  =
-MTD_CSRCS  = m25px.c
+MTD_CSRCS  = ftl.c m25px.c
 

include/nuttx/mtd.h

@@ -71,7 +71,7 @@ struct mtd_geometry_s
   uint16 blocksize;     /* Size of one read/write block */
   uint16 erasesize;     /* Size of one erase blocks -- must be a multiple
                          * of blocksize. */
-  size_t neraseblocks; /* Number of erase blocks */
+  size_t neraseblocks;  /* Number of erase blocks */
 };
 
 /* This structure defines the interface to a simple memory technology device.
@@ -83,7 +83,7 @@ struct mtd_dev_s
 {
   /* The following methods operate on the MTD: */
 
-  /* Erase the specified erase blocks */
+  /* Erase the specified erase blocks (units are erase blocks) */
 
   int (*erase)(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks);
 

include/nuttx/rwbuffer.h

@@ -106,7 +106,7 @@ struct rwbuffer_s
 
   uint16        blocksize;       /* The size of one block */
   size_t        nblocks;         /* The total number blocks supported */
-  void         *dev;             /* Device state passed to callout functions */
+  FAR void     *dev;             /* Device state passed to callout functions */
 
   /* Write buffer setup.  If CONFIG_FS_WRITEBUFFER is defined, but you
    * want read-ahead-only operation, (1) set wrmaxblocks to zero and do