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This commit allows to use non-standard UBI volume name as the rootfs volume in sysupgrade. ex.: The U-Boot on Buffalo WXR-2533DHP checks existence and checksum of "ubi_rootfs" volume when booting, so this name is required. OpenWrt currently provides several patches: 490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch 491-ubi-auto-create-ubiblock-device-for-rootfs.patch 492-try-auto-mounting-ubi0-rootfs-in-init-do_mounts.c.patch to facilitate ubi rootfs automount. However the upstream kernel also supports the means of booting from a fully custom ubi partition name and ubi volume name via bootargs/kernel's cmdline parameters: ubi.mtd=mtd_partition_name ubi.block=rootfs_volume_name root=/dev/ubiblock$X_$Y For more information and examples visit the wiki over at linux-mtd: <http://www.linux-mtd.infradead.org/faq/ubifs.html> <http://www.linux-mtd.infradead.org/doc/ubi.html> Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com> Signed-off-by: Christian Lamparter <chunkeey@gmail.com> [reworded commit]