其實移植yaffs還是比較簡單，代碼編譯還是挺順利的，但是我碰到了第一次燒寫不能啟動，的重新燒寫內核才行，剛開始移植認為是Ecc校驗有問題，查了好久，今天來了靈感，在燒寫是突然想到內核是多大，超過了2M，唉，這個問題糾結了好久啊~終於解決了~
第一步，我們需要YAFFS2的源碼，如果大家有興趣想了解YAFFS2文件系統的驅動原理的話可以直接去訪問他們的官網，地址是www.yaffs.net
下載是有兩種方法：一種用git，還有一種直接下載~不過直接下載可能打不開
第二步，將下載下來的YAFFS2最新源碼 YAFFS2.tar.gz 放入你Linux的任意一個目錄下，執行 tar zxvf YAFFS2.tar.gz 然後進入YAFFS2源碼包，由於最新的源碼再執行腳本 patch-ker.sh（具體方法見此目錄下README-linux-patch） 時 有四個參數，可以追加：c,l,m,s,
./patch-ker.sh c/l m/s kernelpath
if c/l is c, then copy. If l then link
if m/s is m, then use multi version code. If s then use single version code
上面這段英文應該很好懂吧，簡而言之，C 是復制文件，L是鏈接文件，M是多種，S是單個的
xiao@urbetter-Ubuntu:~/linux-3.6.6$ ./patch-ker.sh c m ../linux-3.6.6 即可！
第三步：配置（make menuconfig）
Device Drivers --->
<*> Memory Technology Device (MTD) support --->
<*> Direct char device access to MTD devices | |
| | -*- Common interface to block layer for MTD 'translation layers' | |
| | <*> Caching block device access to MTD devices
File systems --->
[*] Miscellaneous filesystems --->
<*> yaffs2 file system support | |
| | -*- 512 byte / page devices | |
| | [ ] Use older-style on-NAND data format with pageStatus byte | |
| | [ ] Lets yaffs do its own ECC | |
| | -*- 2048 byte (or larger) / page devices | |
| | [*] Autoselect yaffs2 format | |
| | [ ] Disable yaffs from doing ECC on tags by default | |
| | [ ] Force chunk erase check | |
| | [ ] Empty lost and found on boot | |
| | [ ] Disable yaffs2 block refreshing | |
| | [ ] Disable yaffs2 background processing | |
| | [*] Enable yaffs2 xattr support
第四步：編譯
fs/yaffs2/yaffs_vfs.c:438: warning: initialization from incompatible pointer type
fs/yaffs2/yaffs_vfs.c:439: warning: initialization from incompatible pointer type
fs/yaffs2/yaffs_vfs.c:443: warning: initialization from incompatible pointer type
fs/yaffs2/yaffs_vfs.c:445: warning: initialization from incompatible pointer type
fs/yaffs2/yaffs_vfs.c:478: error: unknown field 'write_super' specified in initializer （在fs.h中的struct super_operations中添加 void (*write_super) (struct super_block *); ）
fs/yaffs2/yaffs_vfs.c:478: warning: initialization from incompatible pointer type
fs/yaffs2/yaffs_vfs.c: In function 'yaffs_evict_inode':
fs/yaffs2/yaffs_vfs.c:873: error: implicit declaration of function 'end_writeback' （此函數改為了clear_inode）
fs/yaffs2/yaffs_vfs.c: In function 'yaffs_do_sync_fs':
fs/yaffs2/yaffs_vfs.c:2203: error: 'struct super_block' has no member named 's_dirt' （新版中去掉了這個函數，你可以選擇去掉，當然我選著了定義此函數）
fs/yaffs2/yaffs_vfs.c:2214: error: 'struct super_block' has no member named 's_dirt' 在fs.h的struct super_block中添加unsigned char s_dirt;
fs/yaffs2/yaffs_vfs.c:2216: error: 'struct super_block' has no member named 's_dirt'
fs/yaffs2/yaffs_vfs.c: In function 'yaffs_put_super':
fs/yaffs2/yaffs_vfs.c:2506: error: 'struct mtd_info' has no member named 'sync' 添加下劃線
fs/yaffs2/yaffs_vfs.c:2507: error: 'struct mtd_info' has no member named 'sync'
fs/yaffs2/yaffs_vfs.c: In function 'yaffs_touch_super':
fs/yaffs2/yaffs_vfs.c:2523: error: 'struct super_block' has no member named 's_dirt'
fs/yaffs2/yaffs_vfs.c: In function 'yaffs_internal_read_super':
fs/yaffs2/yaffs_vfs.c:2699: error: 'struct mtd_info' has no member named 'erase'
fs/yaffs2/yaffs_vfs.c:2700: error: 'struct mtd_info' has no member named 'read'
fs/yaffs2/yaffs_vfs.c:2701: error: 'struct mtd_info' has no member named 'write'
fs/yaffs2/yaffs_vfs.c:2702: error: 'struct mtd_info' has no member named 'read_oob'
fs/yaffs2/yaffs_vfs.c:2703: error: 'struct mtd_info' has no member named 'write_oob'
fs/yaffs2/yaffs_vfs.c:2704: error: 'struct mtd_info' has no member named 'block_isbad'
fs/yaffs2/yaffs_vfs.c:2705: error: 'struct mtd_info' has no member named 'block_markbad'
fs/yaffs2/yaffs_vfs.c:2729: error: 'struct mtd_info' has no member named 'erase'
fs/yaffs2/yaffs_vfs.c:2730: error: 'struct mtd_info' has no member named 'block_isbad'
fs/yaffs2/yaffs_vfs.c:2731: error: 'struct mtd_info' has no member named 'block_markbad'
fs/yaffs2/yaffs_vfs.c:2731: error: 'struct mtd_info' has no member named 'read'
fs/yaffs2/yaffs_vfs.c:2731: error: 'struct mtd_info' has no member named 'write'
fs/yaffs2/yaffs_vfs.c:2733: error: 'struct mtd_info' has no member named 'read_oob'
fs/yaffs2/yaffs_vfs.c:2733: error: 'struct mtd_info' has no member named 'write_oob'
fs/yaffs2/yaffs_vfs.c:2754: error: 'struct mtd_info' has no member named 'erase'
fs/yaffs2/yaffs_vfs.c:2754: error: 'struct mtd_info' has no member named 'read'
fs/yaffs2/yaffs_vfs.c:2754: error: 'struct mtd_info' has no member named 'write'
fs/yaffs2/yaffs_vfs.c:2756: error: 'struct mtd_info' has no member named 'read_oob'
fs/yaffs2/yaffs_vfs.c:2756: error: 'struct mtd_info' has no member named 'write_oob' （上面都添加下劃線_）
fs/yaffs2/yaffs_vfs.c:2946: error: implicit declaration of function 'd_alloc_root' （此函數改為d_make_root）
fs/yaffs2/yaffs_vfs.c:2946: warning: assignment makes pointer from integer without a cast
fs/yaffs2/yaffs_vfs.c:2955: error: 'struct super_block' has no member named 's_dirt'
make[2]: *** [fs/yaffs2/yaffs_vfs.o] 錯誤 1
make[1]: *** [fs/yaffs2] 錯誤 2
make: *** [fs] 錯誤 2
其他錯一般都是添加下劃線即可！
第五步：燒寫
yaffs: dev is 32505858 name is "mtdblock2" rw
yaffs: passed flags ""
VFS: Mounted root (yaffs2 filesystem) on device 31:2.
Freeing init memory: 156K
