OpenWrt – Rev 1

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CI_BLKSZ=65536
CI_LDADR=0x00800000

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_find_part_size() {
        local first dev size erasesize name
        while read dev size erasesize name; do
                name=${name#'"'}; name=${name%'"'}
                [ "$name" = "$1" ] && {
                        echo "$size"
                        break
                }
        done < /proc/mtd
}

platform_do_upgrade_combined() {
        local partitions=$(platform_find_partitions)
        local kernelpart=$(platform_find_kernelpart "${partitions#*:}")
        local erase_size=$((0x${partitions%%:*})); partitions="${partitions#*:}"
        local kern_part_size=0x$(platform_find_part_size "$kernelpart")
        local kern_part_blocks=$(($kern_part_size / $CI_BLKSZ))
        local kern_length=0x$(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))

        v "platform_do_upgrade_combined"
        v "partitions=$partitions"
        v "kernelpart=$kernelpart"
        v "kernel_part_size=$kern_part_size"
        v "kernel_part_blocks=$kern_part_blocks"
        v "kern_length=$kern_length"
        v "erase_size=$erase_size"
        v "kern_blocks=$kern_blocks"
        v "root_blocks=$root_blocks"
        v "kern_pad_blocks=$(($kern_part_blocks-$kern_blocks))"

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

                # write the kernel
                dd if="$1" bs=$CI_BLKSZ skip=1 count=$kern_blocks 2>/dev/null | \
                        mtd -F$kernelpart:$kern_part_size:$CI_LDADR write - $kernelpart
                # write the rootfs
                dd if="$1" bs=$CI_BLKSZ skip=$((1+$kern_blocks)) count=$root_blocks 2>/dev/null | \
                        mtd $append write - rootfs
        else
                echo "invalid image"
        fi
}

platform_check_image() {
        local board=$(board_name)
        local magic="$(get_magic_word "$1")"
        local partitions=$(platform_find_partitions)
        local kernelpart=$(platform_find_kernelpart "${partitions#*:}")
        local kern_part_size=0x$(platform_find_part_size "$kernelpart")
        local kern_length=0x$(dd if="$1" bs=2 skip=1 count=4 2>/dev/null)

        [ "$#" -gt 1 ] && return 1

        case "$board" in
        avila | cambria )
                [ "$magic" != "4349" ] && {
                        echo "Invalid image. Use *-sysupgrade.bin files on this board"
                        return 1
                }

                kern_length_b=$(printf '%d' $kern_length)
                kern_part_size_b=$(printf '%d' $kern_part_size)
                if [ $kern_length_b -gt $kern_part_size_b ]; then
                        echo "Invalid image. Kernel size ($kern_length) exceeds kernel partition ($kern_part_size)"
                        return 1
                fi

                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

                return 0
                ;;
        esac

        echo "Sysupgrade is not yet supported on $board."
        return 1
}

platform_do_upgrade() {
        local board=$(board_name)

        v "board=$board"
        case "$board" in
        avila | cambria )
                platform_do_upgrade_combined "$ARGV"
                ;;
        *)
                default_do_upgrade "$ARGV"
                ;;
        esac
}