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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.
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.
At the moment there is a very basic root fs image available from http://people.gta01.hmw-consulting.de/laforge/tmp/rootfs/rootfs.jffs2
Please note that this image will take ages to boot the first time, since this boot finishes the installation process.