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1. Create "rootfs_data" dynamicaly U-Boot firmware images can contain only 2 UBI volumes: bootfs (container with U-Boot + kernel + DTBs) and rootfs (e.g. squashfs). There is no way to include "rootfs_data" UBI volume or make firmware file tell U-Boot to create one. For that reason "rootfs_data" needs to be created dynamically. Use preinit script to handle that. Fire it right before "mount_root" one. 2. Relate "rootfs_data" to flashed firmware As already explained flashing new firmware with U-Boot will do nothing to the "rootfs_data". It could result in new firmware reusing old "rootfs_data" overlay UBI volume and its file. Users expect a clean state after flashing firmware (even if flashing the same one). Solve that by reading flash counter of running firmware and storing it in "rootfs_data" UBI volume. Every mismatch will result in wiping old data. Signed-off-by: Rafał Miłecki <rafal@milecki.pl> (cherry picked from commit 93259e8ca261c7965618fe11c2d385638da5cfa6)