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Mounting a JFFS2 image

Make the MTD block device 

mknod /dev/mtdblock0 b 31 0

Associate the jffs2 file with a loopback device 

losetup /dev/loop0 /path/to/jffs2/file/eg/Om200Y.MM-gtaNN-YYYYMMDD.rootfs.jffs2

Load the block2mtd module 

modprobe block2mtd

Tell the module which loopback device to use 

echo /dev/loop0 >/sys/module/block2mtd/parameters/block2mtd

Make a mount point for the file system 

mkdir /mnt/jffs2

Mount the file system 

mount -t jffs2 /dev/mtdblock0 /mnt/jffs2/