how to use yaffs under rt-thread.

There are three steps.
1. get yaffs tarball from official repo.
   the repo of official repo is here.
     http://www.aleph1.co.uk/gitweb?p=yaffs2.git;a=summary
   then you should find the 2011-6-28's snapshot, download the tarball
     http://www.aleph1.co.uk/gitweb?p=yaffs2.git;a=snapshot;h=2df51cdb98e799c4d10b4cc7dd7e8858aa79e7d8;sf=tgz
  
   decompress the yaffs.tar.gz to rt-thread\components\dfs\filesystems\yaffs2\yaffs

2. patch yaffs.diff    
    open an terminal.
    (1) on windows
       open cmd command prompt, then use [cd] command to come current path
       for example 
         F:\Project\svn\rt-thread\components\dfs\filesystems\yaffs2>
       then type command 
         patch -p1 < yaffs.diff
       you will get some log information as followings 
         F:\Project\svn\rt-thread\components\dfs\filesystems\yaffs2>patch -p1 < yaffs.diff
         patching file `dfs_yaffs2.c'
         patching file `yaffs/direct/yaffs_list.h'
         patching file `yaffs/direct/yaffs_nandif.c'
         patching file `yaffs/direct/ydirectenv.h'
         patching file `yaffs/direct/yportenv.h'
         patching file `yaffs_nandcfg.c'
         patching file `yaffs_osglue.c'

       now you can delete yaffs.diff

    (2) on linux
       Help yourself. Since you have use linux as your os, I believe in you. 

3.add nand driver and compile 
    In order to use yaffs, you should provide a nand driver which is needed
    by yaffs. There is an example file in rt-thread\components\dfs\filesystems\uffs\nand.
    you should modify yaffs_nandcfg.c according to your nand driver.
 then you can use scons or IDE like MDK or IAR to compile.

 enjoy !