upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
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u-boot/scripts/get_default_envs.sh

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#! /bin/bash
#
# Copyright (C) 2016, Lukasz Majewski <l.majewski@majess.pl>
#
# SPDX-License-Identifier: GPL-2.0+
#
# This file extracts default envs from built u-boot
# usage: get_default_envs.sh > u-boot-env-default.txt
set -ue
ENV_OBJ_FILE="env_common.o"
ENV_OBJ_FILE_COPY="copy_${ENV_OBJ_FILE}"
echoerr() { echo "$@" 1>&2; }
path=$(readlink -f $0)
env_obj_file_path=$(find ${path%/scripts*} -not -path "*/spl/*" \
-name "${ENV_OBJ_FILE}")
[ -z "${env_obj_file_path}" ] && \
{ echoerr "File '${ENV_OBJ_FILE}' not found!"; exit 1; }
cp ${env_obj_file_path} ${ENV_OBJ_FILE_COPY}
# NOTE: objcopy saves its output to file passed in
# (copy_env_common.o in this case)
objcopy -O binary -j ".rodata.default_environment" ${ENV_OBJ_FILE_COPY}
# Replace default '\0' with '\n' and sort entries
tr '\0' '\n' < ${ENV_OBJ_FILE_COPY} | sort -u
rm ${ENV_OBJ_FILE_COPY}
exit 0