Hi, It seems that crc32.h & crc32.c are in fs/jffs2/ of mtd. So when we copy it over, we assume to put it in $TOPDIR/fs/jffs2/ But they are expected in include/linux/, as the files in fs/jffs2 from the mtd release say : #include <linux/crc32.h> Is this a bug or intentional? Murtada