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Creating a root filesystem from scratch

To create a root file system image for storage in NAND flash, we use the mkfs.jffs2 program contained int the Debian package mtd-tools.

mkfs.jffs2 --pad=0x700000 -o rootfs.jffs2 -e 0x4000 -n -d/tmp/jffsroot/

is a typical command. It creates a FS image for our erase block size of 16k, padded to 0x700000 bytes in length from the files contained in the /tmp/jffsroot directory and stores the FS image in rootfs.jffs2.

Using pre-created root fs image


OpenEmbedded will itself create a jffs2 image at the end of the build process.

Once the build server is running, it will create root filesystem images for us.

demo JFFS2 root image

At the moment there is a very basic root fs image available from

Please note that this image will take ages to boot the first time, since this boot finishes the installation process.

Flashing a root filesystem into NAND

See U-boot#Writing_rootfs_to_NAND