OpenWrt – Rev 1

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#
# Copyright (C) 2014 OpenWrt.org
#

linksys_get_target_firmware() {
        cur_boot_part=`/usr/sbin/fw_printenv -n boot_part`
        target_firmware=""
        if [ "$cur_boot_part" = "1" ]
        then
                # current primary boot - update alt boot
                target_firmware="kernel2"
                fw_setenv boot_part 2
                fw_setenv bootcmd "run altnandboot"
        elif [ "$cur_boot_part" = "2" ]
        then
                # current alt boot - update primary boot
                target_firmware="kernel1"
                fw_setenv boot_part 1
                fw_setenv bootcmd "run nandboot"
        fi

        echo "$target_firmware"
}

linksys_get_root_magic() {
        (get_image "$@" | dd skip=786432 bs=4 count=1 | hexdump -v -n 4 -e '1/1 "%02x"') 2>/dev/null
}

platform_do_upgrade_linksys() {
        local magic_long="$(get_magic_long "$1")"

        mkdir -p /var/lock
        local part_label="$(linksys_get_target_firmware)"
        touch /var/lock/fw_printenv.lock

        if [ ! -n "$part_label" ]
        then
                echo "cannot find target partition"
                exit 1
        fi

        local target_mtd=$(find_mtd_part $part_label)

        [ "$magic_long" = "73797375" ] && {
                CI_KERNPART="$part_label"
                if [ "$part_label" = "kernel1" ]
                then
                        CI_UBIPART="rootfs1"
                else
                        CI_UBIPART="rootfs2"
                fi

                nand_upgrade_tar "$1"
        }
        [ "$magic_long" = "27051956" ] && {
                # check firmwares' rootfs types
                local target_mtd=$(find_mtd_part $part_label)
                local oldroot="$(linksys_get_root_magic $target_mtd)"
                local newroot="$(linksys_get_root_magic "$1")"

                if [ "$newroot" = "55424923" -a "$oldroot" = "55424923" ]
                # we're upgrading from a firmware with UBI to one with UBI
                then
                        # erase everything to be safe
                        mtd erase $part_label
                        get_image "$1" | mtd -n write - $part_label
                else
                        get_image "$1" | mtd write - $part_label
                fi
        }
}