在移植linux2.6.38版本内核到s3c6410时出现以下错误
VFS: Cannot open root device"mtdblock2" or unknown-block(31,2)
Please append a correct "root="boot option; here are the available partitions:
1f00 512 mtdblock0 (driver?)
1f01 5120 mtdblock1 (driver?)
1f02 256512 mtdblock2 (driver?)
Kernel panic - not syncing: VFS: Unable tomount root fs on unknown-block(31,2)
查看打印信息，确定nandflash设备已经起来，并且已完成分区，排除了存储设备的问题，突然想到内核是不支持yaffs2文件系统的，所以得手动添加，让内核支持yaffs2文件系统。
1. 网上下载yaffs2源码
2. 解压，进入源码根目录，执行以下命令;
\ shpatch-ker.sh c /work/s3c6410/kernel/linux-2.6.38.5/
注：/work/s3c6410/kernel/linux-2.6.38.5/为内核目录
3.配置内核，支持yaffs2
Filesystems --->
[*]Miscellaneous filesystems --->
<*> YAFFS2 file system support
另外下面选项也要选上，要不会出不来上面的选项的
<*> Caching block device access to MTDdevices
问题一：
编译时出现一下问题：
fs/yaffs2/yaffs_fs.c:275: warning:initialization from incompatible pointer type
fs/yaffs2/yaffs_fs.c:334: warning:initialization from incompatible pointer type
fs/yaffs2/yaffs_fs.c:347: error: unknownfield 'delete_inode' specified in initializer
fs/yaffs2/yaffs_fs.c:347: warning:initialization from incompatible pointer type
fs/yaffs2/yaffs_fs.c:348: error: unknownfield 'clear_inode' specified in initializer
fs/yaffs2/yaffs_fs.c:348: warning:initialization from incompatible pointer type
fs/yaffs2/yaffs_fs.c: In function'yaffs_delete_inode':
fs/yaffs2/yaffs_fs.c:563: error: implicitdeclaration of function 'clear_inode'
fs/yaffs2/yaffs_fs.c: In function'yaffs_write_begin':
fs/yaffs2/yaffs_fs.c:748: error: implicitdeclaration of function '__grab_cache_page'
fs/yaffs2/yaffs_fs.c:748: warning:assignment makes pointer from integer without a cast
fs/yaffs2/yaffs_fs.c: In function'yaffs_mknod':
fs/yaffs2/yaffs_fs.c:1236: error: 'structtask_struct' has no member named 'fsuid'
fs/yaffs2/yaffs_fs.c:1237: error: 'structtask_struct' has no member named 'fsgid'
fs/yaffs2/yaffs_fs.c: In function'yaffs_symlink':
fs/yaffs2/yaffs_fs.c:1416: error: 'structtask_struct' has no member named 'fsuid'
fs/yaffs2/yaffs_fs.c:1417: error: 'structtask_struct' has no member named 'fsgid'
fs/yaffs2/yaffs_fs.c: In function'yaffs_setattr':
fs/yaffs2/yaffs_fs.c:1541: error: implicitdeclaration of function 'inode_setattr'
fs/yaffs2/yaffs_fs.c: In function'yaffs_internal_read_super':
fs/yaffs2/yaffs_fs.c:1957: warning: format'%d' expects type 'int', but argument 2 has type 'uint64_t'
fs/yaffs2/yaffs_fs.c:2123: error: implicitdeclaration of function 'init_MUTEX'
出现该问题原因：
Linux版本与yaffs2版本不兼容，下载新版yaffs2，或者给yaffs2打补丁。