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To optimize the flash usage and to make firmware upgrades simpler, catenate the three firmware partitions "Kern", "Ramdisk" and "Application" into one, and use all of this for the combined MTD-splitted kernel+rootfs. This works fine as long as the kernel is placed in the beginning of this firmware partition and we leave the RedBoot partition as is, so the boot loader still can load the kernel from the first two RedBoot partitions. Using the RedBoot partitions "as is" can be considered harmful, because when you flash to a RedBoot partition the file size is used for downsizing of the partition and make firmware upgrades fail if they are larger than the RedBoot partition size after flashing, despite there is actually flash there. So overriding with fixed partitions is just generally a good idea. Link: https://github.com/openwrt/openwrt/pull/21820 Signed-off-by: Linus Walleij <linusw@kernel.org>