OpenWrt – Rev 1

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CI_BLKSZ=65536
CI_LDADR=0x80041000

platform_find_partitions() {
        local first dev size erasesize name
        while read dev size erasesize name; do
                name=${name#'"'}; name=${name%'"'}
                case "$name" in
                        vmlinux.bin.l7|kernel|linux|rootfs)
                                if [ -z "$first" ]; then
                                        first="$name"
                                else
                                        echo "$erasesize:$first:$name"
                                        break
                                fi
                        ;;
                esac
        done < /proc/mtd
}

platform_find_kernelpart() {
        local part
        for part in "${1%:*}" "${1#*:}"; do
                case "$part" in
                        vmlinux.bin.l7|kernel|linux)
                                echo "$part"
                                break
                        ;;
                esac
        done
}

platform_check_image() {
        [ "$#" -gt 1 ] && return 1

        case "$(get_magic_word "$1")" in
                # Combined Image
                4349)
                        local md5_img=$(dd if="$1" bs=2 skip=9 count=16 2>/dev/null)
                        local md5_chk=$(dd if="$1" bs=$CI_BLKSZ skip=1 2>/dev/null | md5sum -); md5_chk="${md5_chk%% *}"

                        if [ -n "$md5_img" -a -n "$md5_chk" ] && [ "$md5_img" = "$md5_chk" ]; then
                                return 0
                        else
                                echo "Invalid image. Contents do not match checksum (image:$md5_img calculated:$md5_chk)"
                                return 1
                        fi
                ;;
                *)
                        echo "Invalid image. Use combined .img files on this platform"
                        return 1
                ;;
        esac
}

platform_do_upgrade() {
        local partitions=$(platform_find_partitions)
        local kernelpart=$(platform_find_kernelpart "${partitions#*:}")
        local erase_size=$((0x${partitions%%:*})); partitions="${partitions#*:}"
        local kern_length=0x$(dd if="$1" bs=2 skip=1 count=4 2>/dev/null)
        local kern_blocks=$(($kern_length / $CI_BLKSZ))
        local root_blocks=$((0x$(dd if="$1" bs=2 skip=5 count=4 2>/dev/null) / $CI_BLKSZ))

        if [ -n "$partitions" ] && [ -n "$kernelpart" ] && \
           [ ${kern_blocks:-0} -gt 0 ] && \
           [ ${root_blocks:-0} -gt ${kern_blocks:-0} ] && \
           [ ${erase_size:-0} -gt 0 ];
        then
                local append=""
                [ -f "$CONF_TAR" -a "$SAVE_CONFIG" -eq 1 ] && append="-j $CONF_TAR"

                ( dd if="$1" bs=$CI_BLKSZ skip=1 count=$kern_blocks 2>/dev/null; \
                  dd if="$1" bs=$CI_BLKSZ skip=$((1+$kern_blocks)) count=$root_blocks 2>/dev/null ) | \
                        mtd -r $append -F$kernelpart:$kern_length:$CI_LDADR,rootfs write - $partitions
        fi
}