其实移植yaffs还是比较简单，代码编译还是挺顺利的，但是我碰到了第一次烧写不能启动，的重新烧写内核才行，刚开始移植认为是Ecc校验有问题，查了好久，今天来了灵感，在烧写是突然想到内核是多大，超过了2M，唉，这个问题纠结了好久啊~终于解决了~
第一步，我们需要YAFFS2的源码，如果大家有兴趣想了解YAFFS2文件系统的驱动原理的话可以直接去访问他们的官网，地址是
下载是有两种方法：一种用git，还有一种直接下载~不过直接下载可能打不开
第二步，将下载下来的YAFFS2最新源码 YAFFS2.tar.gz 放入你Linux的任意一个目录下，执行 tar zxvf YAFFS2.tar.gz 然后进入YAFFS2源码包，由于最新的源码再执行脚本 patch-ker.sh（具体方法见此目录下README-linux-patch） 时 有四个参数，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
上面这段英文应该很好懂吧，简而言之，C 是复制文件，L是链接文件，M是多种，S是单个的
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：编译
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' （此函数改为了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' （新版中去掉了这个函数，你可以选择去掉，当然我选着了定义此函数）
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' 添加下划线
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' （上面都添加下划线_）
fs/yaffs2/yaffs_vfs.c:2946: error: implicit declaration of function 'd_alloc_root' （此函数改为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] 错误 1
make[1]: *** [fs/yaffs2] 错误 2
make: *** [fs] 错误 2
其他错一般都是添加下划线即可！
第五步：烧写
yaffs: dev is 32505858 name is "mtdblock2" rw
yaffs: passed flags ""
VFS: Mounted root (yaffs2 filesystem) on device 31:2.
Freeing init memory: 156K