OpenWrt – Rev 4

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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="alt_kernel"
                fw_setenv boot_part 2
                # In the Linksys EA6350v3, it is enough to set the boot_part as the boot command line is
                # bootcmd=if test $boot_part = 1; then run bootpart1; else run bootpart2; fi
                # - You probably want to use that if your device's uboot does not eval bootcmd
                #fw_setenv bootcmd "run altnandboot"
        elif [ "$cur_boot_part" = "2" ]; then
                # current alt boot - update primary boot
                target_firmware="kernel"
                fw_setenv boot_part 1
                #fw_setenv bootcmd "run nandboot"
        fi

        # re-enable recovery so we get back if the new firmware is broken
        fw_setenv auto_recovery yes
        # see /etc/init.d/zlinksys_recovery

        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" = "kernel" ]; then
                        CI_UBIPART="rootfs"
                else
                        CI_UBIPART="alt_rootfs"
                fi

                # remove "squashfs" vol (in case we are flashing over a stock image, which is also UBI)

                local mtdnum="$( find_mtd_index "$CI_UBIPART" )"
                if [ ! "$mtdnum" ]; then
                        echo "cannot find ubi mtd partition $CI_UBIPART"
                        return 1
                fi

                local ubidev="$( nand_find_ubi "$CI_UBIPART" )"
                if [ ! "$ubidev" ]; then
                        ubiattach -m "$mtdnum"
                        sync
                        ubidev="$( nand_find_ubi "$CI_UBIPART" )"
                fi

                if [ "$ubidev" ]; then
                        local squash_ubivol="$( nand_find_volume $ubidev squashfs )"
                        # kill volume
                        [ "$squash_ubivol" ] && ubirmvol /dev/$ubidev -N squashfs || true
                fi

                # complete std upgrade
                nand_upgrade_tar "$1"
        }
        [ "$magic_long" = "27051956" ] && {
                # This magic is for a uImage (which is a sysupgrade image)
                # check firmwares' rootfs types
                local oldroot="$(linksys_get_root_magic $target_mtd)"
                local newroot="$(linksys_get_root_magic "$1")"

                if [ "$newroot" = "55424923" -a "$oldroot" = "55424923" ]; then
                        # we're upgrading from a firmware with UBI to one with UBI
                        # erase everything to be safe
                        # - Is that really needed? Won't remove (or comment) the if, because it may be needed in a future device.
                        #mtd erase $part_label
                        #get_image "$1" | mtd -n write - $part_label
                        echo "writing \"$1\" UBI image to \"$part_label\" (UBI)..."
                        get_image "$1" | mtd write - $part_label
                else
                        echo "writing \"$1\" image to \"$part_label\""
                        get_image "$1" | mtd write - $part_label
                fi
        }
}