Hello!

There is some files like yaffs_vfs_single.c and yaffs_vfs_multi.c in the YAFFS source code. In the first one, the comment says it supports the single version. In the second one, the comment says that it should compile for any version of linux. 

What does the single version mean?

If the second one is suitable for any version of linux, what is the importance of the first one?

Thanks