OpenWrt – Rev 1

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#
# Copyright (C) 2015 OpenWrt.org
#

. /lib/functions.sh
#Note: this code also uses some functions from nand.sh, but it is expected to be run by nand.sh, so we are not
#sourcing it explicitly here

UBNT_ERX_KERNEL_INDEX_OFFSET=160

ubnt_get_target_kernel() {
        local factory_mtd=$1
        local current_kernel_index=$(hexdump -s $UBNT_ERX_KERNEL_INDEX_OFFSET -n 1 -e '/1 "%X "' ${factory_mtd})

        if [ $current_kernel_index == "0" ]; then
                echo 'kernel2'
        elif [ $current_kernel_index == "1" ]; then
                echo 'kernel1'
        fi
}

ubnt_update_target_kernel() {
        local factory_mtd=$1
        local kernel_part=$2

        local new_kernel_index
        if [ $kernel_part == "kernel1" ]; then
                new_kernel_index="\x00"
        elif [ $kernel_part == "kernel2" ]; then
                new_kernel_index="\x01"
        else
                echo 'Unknown kernel image index' >&2
                return 1
        fi

        if ! (echo -e $new_kernel_index | dd of=${factory_mtd} bs=1 count=1 seek=$UBNT_ERX_KERNEL_INDEX_OFFSET); then
                echo 'Failed to update kernel bootup index' >&2
                return 1
        fi
}

platform_upgrade_ubnt_erx() {
        local factory_mtd=$(find_mtd_part factory)
        if [ -z "$factory_mtd" ]; then
                echo "cannot find factory partition" >&2
                exit 1
        fi

        local kernel_part="$(ubnt_get_target_kernel ${factory_mtd})"
        if [ -z "$kernel_part" ]; then
                echo "cannot find factory partition" >&2
                exit 1
        fi

        # This is a global defined in nand.sh, sets partition kernel will be flashed into
        CI_KERNPART=${kernel_part}

        #Remove volume possibly left over from stock firmware
        local ubidev="$( nand_find_ubi "$CI_UBIPART" )"
        if [ -z "$ubidev" ]; then
                local mtdnum="$( find_mtd_index "$CI_UBIPART" )"
                if [ -z "$mtdnum" ]; then
                        echo "cannot find ubi mtd partition $CI_UBIPART" >&2
                        exit 1
                fi
                ubiattach -m "$mtdnum"
                sync
                ubidev="$( nand_find_ubi "$CI_UBIPART" )"
        fi
        if [ -n "$ubidev" ]; then
                local troot_ubivol="$( nand_find_volume $ubidev troot )"
                [ -n "$troot_ubivol" ] && ubirmvol /dev/$ubidev -N troot || true
        fi

        ubnt_update_target_kernel ${factory_mtd} ${kernel_part} || exit 1
}