1. get DDWRT source ,sync linux 3.3 fs to your linux 3.3 source .
(1) fs/squashfs -> complete change
(2) fs/Kconfig - > merge
(3) include/linux/ add 3 file to your linux 3.x /include/linux
squashfs_fs.h
squashfs_fs_i.h
squashfs_fs_sb.h
(4) sync include/linux/magic.h /* main purpose mark squash4 magic //#define SQUASHFS_MAGIC 0x73717368*/
