unify download/build scripts

move resources/scripts/download/ to:
resources/scripts/update/module/

This: ./download coreboot
Is now: ./update module coreboot

However, running "./download coreboot"
still works, via backwards compatibility.

Signed-off-by: Leah Rowe <leah@libreboot.org>

9 files changed, 795 insertions, 0 deletions

diff --git a/resources/scripts/update/module/bios_extract b/resources/scripts/update/module/bios_extract
new file mode 100755
index 00000000..1688aabe
--- /dev/null
+++ b/resources/scripts/update/module/bios_extract
@@ -0,0 +1,22 @@
+#!/usr/bin/env sh
+#
+#   Copyright (C) 2023 Leah Rowe <info@minifree.org>
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+[ "x${DEBUG+set}" = 'xset' ] && set -v
+set -u -e
+
+./gitclone bios_extract
diff --git a/resources/scripts/update/module/coreboot b/resources/scripts/update/module/coreboot
new file mode 100755
index 00000000..75b61a6f
--- /dev/null
+++ b/resources/scripts/update/module/coreboot
@@ -0,0 +1,182 @@
+#!/usr/bin/env bash
+
+#  helper script: download coreboot
+#
+#	Copyright (C) 2014-2016,2020,2021,2023 Leah Rowe <info@minifree.org>
+#	Copyright (C) 2022 Alper Nebi Yasak <alpernebiyasak@gmail.com>
+#
+#	This program is free software: you can redistribute it and/or modify
+#	it under the terms of the GNU General Public License as published by
+#	the Free Software Foundation, either version 3 of the License, or
+#	(at your option) any later version.
+#
+#	This program is distributed in the hope that it will be useful,
+#	but WITHOUT ANY WARRANTY; without even the implied warranty of
+#	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#	GNU General Public License for more details.
+#
+#	You should have received a copy of the GNU General Public License
+#	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+[ "x${DEBUG+set}" = 'xset' ] && set -v
+set -u -e
+
+_board=""
+cbtree=""
+cbrevision=""
+
+cbcfgsdir="resources/coreboot"
+
+main()
+{
+	rm -f ${cbcfgsdir}/*/seen
+
+	printf "Downloading coreboot and (if available) applying patches\n"
+
+	boards=""
+	if [ $# -gt 0 ]; then
+		boards=$@
+	else
+		for board in "${cbcfgsdir}/"*; do
+			[ ! -d "${board}" ] && continue
+			boards="${boards} ${board##*/}"
+		done
+	fi
+	for board in ${boards}; do
+		rm -f "${cbcfgsdir}"/*/seen
+		download_coreboot_for_board "${board}"
+	done
+
+	rm -f ${cbcfgsdir}/*/seen
+}
+
+download_coreboot_for_board()
+{
+	_board="${1}"
+	cbtree="undefined"
+	cbrevision="undefined"
+
+	fetch_coreboot_config "${_board}" || exit 1
+
+	rm -f "${cbcfgsdir}"/*/seen
+
+	if [ -d "coreboot/${cbtree}" ]; then
+		printf "REMARK: download/coreboot %s: exists. Skipping.\n" \
+				${cbtree}
+		[ "${cbtree}" != "${1}" ] && \
+			printf "(for board: '%s}')\n" ${1}
+		return 0
+	fi
+
+	gitclone_coreboot_from_upstream || exit 1
+
+	prepare_new_coreboot_tree "${1}" "${cbtree}" "${cbrevision}" \
+			|| exit 1
+}
+
+fetch_coreboot_config()
+{
+	_board=${1}
+
+	while true; do
+		cbrevision="undefined"
+		cbtree="undefined"
+
+		check_config_for_board "${_board}" || return 1
+
+		# This is to override $cbrevision and $cbtree
+		source "${cbcfgsdir}/${_board}/board.cfg" || exit 1
+
+		if [ "${_board}" != "${cbtree}" ]; then
+			_board="${cbtree}"
+			continue
+		elif [ "${cbtree}" = "undefined" ]; then
+			printf "ERROR: download/coreboot:"
+			printf " tree name undefined for '%s\n'" \
+					${_board}
+			return 1
+		elif [ "${cbrevision}" = "undefined" ]; then
+			printf "ERROR: download/coreboot:"
+			printf " commit ID undefined for '%s'\n" \
+					${_board}
+			return 1
+		else
+			break
+		fi
+	done
+}
+
+check_config_for_board()
+{
+	_board=${1}
+
+	if [ ! -f "${cbcfgsdir}/${_board}/board.cfg" ]; then
+		printf "ERROR: download/coreboot: board.cfg does not"
+		printf " exist for '%s'\n" ${_board}
+		return 1
+	elif [ -f "${cbcfgsdir}/${_board}/seen" ]; then
+		printf "ERROR: download/coreboot: logical loop:"
+		printf " '%s' board.cfg refers to another tree," ${_board}
+		printf " which ultimately refers back to '%s'." ${_board}
+		return 1
+	fi
+	touch "${cbcfgsdir}/${_board}/seen"
+}
+
+gitclone_coreboot_from_upstream()
+{
+	[ ! -d coreboot ] && \
+		mkdir -p coreboot
+	[ ! -d coreboot ] && \
+		return 1
+	[ -d coreboot/coreboot ] && \
+		return 0
+	./gitclone coreboot || \
+		return 1
+}
+
+prepare_new_coreboot_tree()
+{
+	target=${1}
+	cbtree=${2}
+	cbrevision=${3}
+
+	printf "Preparing coreboot tree: %s\n" ${cbtree}
+	[ "${cbtree}" != "${target}" ] && \
+		printf "(for board: %s)\n" "${target}"
+
+	cp -R coreboot/coreboot "coreboot/${cbtree}" || exit 1
+	(
+	cd "coreboot/${cbtree}" \
+		|| err "cannot cd to coreboot/${cbtree}"
+	git reset --hard ${cbrevision} \
+		|| err "cannot reset coreboot revision for tree, ${cbtree}"
+	git submodule update --init --checkout \
+		|| err "cannot update coreboot submodules for tree, ${cbtree}"
+
+	for patch in ../../"${cbcfgsdir}"/"${cbtree}"/patches/*.patch; do
+		[ ! -f "${patch}" ] && \
+			continue
+		if ! git am "${patch}"; then
+			git am --abort
+			err "cannot patch ${cbtree}"
+		fi
+	done
+
+	# extra.sh can be used for anything
+	# but should *only* be a last resort
+	if [ -f "../../${cbcfgsdir}/${cbtree}/extra.sh" ]; then
+		"../../${cbcfgsdir}/${cbtree}/extra.sh" || \
+			err "${cbtree} extra.sh"
+	fi
+	)
+}
+
+err()
+{
+	printf "ERROR: %s: %s\n" $0 $1 1>&2
+	exit 1
+}
+
+main $@
diff --git a/resources/scripts/update/module/flashrom b/resources/scripts/update/module/flashrom
new file mode 100755
index 00000000..6aa3cab4
--- /dev/null
+++ b/resources/scripts/update/module/flashrom
@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+#  helper script: downloads flashrom and patches it
+#
+#	Copyright (C) 2014, 2015, 2020, 2021 Leah Rowe <info@minifree.org>
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+[ "x${DEBUG+set}" = 'xset' ] && set -v
+set -u -e
+
+./gitclone flashrom
diff --git a/resources/scripts/update/module/grub b/resources/scripts/update/module/grub
new file mode 100755
index 00000000..0620a775
--- /dev/null
+++ b/resources/scripts/update/module/grub
@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+
+#  helper script: Downloads GRUB and patches it.
+#
+#	Copyright (C) 2014,2015,2016,2020,2021,2023 Leah Rowe
+#							<info@minifree.org>
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+[ "x${DEBUG+set}" = 'xset' ] && set -v
+set -u -e
+
+./gitclone grub
+./gitclone gnulib || rm -Rf grub/
+if [ ! -d grub ]; then
+	printf "%s: Could not download grub and gnulib\n" ${0}
+	exit 1
+else
+	exit 0
+fi
diff --git a/resources/scripts/update/module/me_cleaner b/resources/scripts/update/module/me_cleaner
new file mode 100755
index 00000000..7dd52be7
--- /dev/null
+++ b/resources/scripts/update/module/me_cleaner
@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+#
+#   Copyright (C) 2020 Leah Rowe <info@minifree.org>
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+# This script assumes that the working directory is the
+# root of retroboot_src or retroboot git.
+
+[ "x${DEBUG+set}" = 'xset' ] && set -v
+set -u -e
+
+./gitclone me_cleaner
diff --git a/resources/scripts/update/module/memtest86plus b/resources/scripts/update/module/memtest86plus
new file mode 100755
index 00000000..bceadbd9
--- /dev/null
+++ b/resources/scripts/update/module/memtest86plus
@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+
+#  helper script: Downloads MemTest86+ and patches it
+#
+#	Copyright (C) 2014, 2015, 2020, 2021 Leah Rowe <info@minifree.org>
+#	Copyright (C) 2015 Joseph Michael Thompson <jmt@josepht.me>
+#	Copyright (C) 2015 Klemens Nanni <contact@autoboot.org>
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+[ "x${DEBUG+set}" = 'xset' ] && set -v
+set -u -e
+
+# Get the last version of MemTest86+ used, apply patches, build it.
+
+# Remove the old version that may exist
+# ------------------------------------------------------------------------------
+
+printf "Downloading MemTest86+\n"
+./gitclone memtest86plus 
diff --git a/resources/scripts/update/module/mrc b/resources/scripts/update/module/mrc
new file mode 100755
index 00000000..ed0b38f3
--- /dev/null
+++ b/resources/scripts/update/module/mrc
@@ -0,0 +1,188 @@
+#!/usr/bin/env sh
+
+# Download Intel MRC images
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, version 2 of the License.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+[ "x${DEBUG+set}" = 'xset' ] && set -v
+set -u -e
+export PATH="${PATH}:/sbin"
+
+# This file is forked from util/chromeos/crosfirmware.sh in coreboot cfc26ce278
+# Changes to it in *this version* are copyright 2021 and 2023 Leah Rowe, under
+# the same license as above.
+
+# use updated manifest from wayback machine, when updating mrc.bin,
+# and update the other variables below accordingly. current manifest used:
+# https://web.archive.org/web/20210211071412/https://dl.google.com/dl/edgedl/chromeos/recovery/recovery.conf
+
+# the wayback machine is used so that we get the same manifest. google
+# does not seem to version the manifest, but archives are available
+
+# variables taken from that manifest:
+
+_board="peppy"
+_file="chromeos_12239.92.0_peppy_recovery_stable-channel_mp-v3.bin"
+_url="https://dl.google.com/dl/edgedl/chromeos/recovery/chromeos_12239.92.0_peppy_recovery_stable-channel_mp-v3.bin.zip"
+_url2="https://web.archive.org/web/20200516070928/https://dl.google.com/dl/edgedl/chromeos/recovery/chromeos_12239.92.0_peppy_recovery_stable-channel_mp-v3.bin.zip"
+_sha1sum="cd5917cbe7f821ad769bf0fd87046898f9e175c8"
+_mrc_complete_hash="d18de1e3d52c0815b82ea406ca07897c56c65696"
+_mrc_complete="mrc/haswell/mrc.bin"
+
+cbdir="coreboot/default"
+cbfstool="${cbdir}/util/cbfstool/cbfstool"
+
+sname=""
+
+main()
+{
+	sname=${0}
+	printf "Downloading Intel MRC blobs\n"
+
+	check_existing && exit 0
+	build_dependencies || fail "could not build dependencies"
+	fetch_mrc || fail "could not fetch mrc.bin"
+}
+
+check_existing()
+{
+	if [ ! -f ${_mrc_complete} ]; then
+		return 1
+	fi
+	printf 'found existing mrc.bin, checking its hash\n'
+	if [ "$(sha1sum ${_mrc_complete} | awk '{print $1}')" \
+			= "${_mrc_complete_hash}" ]; then
+		printf 'checksums matched, skipping downloading\n'
+		return 0
+	else
+		printf 'hashes did not match, starting over\n'
+		return 1
+	fi
+}
+
+build_dependencies()
+{
+	if [ ! -d "${cbdir}/" ]; then
+	    ./download coreboot default || return 1
+	fi
+	if [ ! -f "${cbfstool}" ]; then
+	    ./build module cbutils default || return 1
+	fi
+	return 0
+}
+
+fetch_mrc()
+{
+	mkdir -p mrc/haswell/ || return 1
+
+	(
+	cd mrc/haswell/
+
+	download_image ${_url} ${_file} ${_sha1sum}
+	if [ ! -f ${_file} ]; then
+		download_image ${_url2} ${_file} ${_sha1sum}
+	fi
+	if [ ! -f $_file ]; then
+		fail "%{_file} not downloaded / verification failed."
+	fi
+
+	extract_partition ROOT-A ${_file} root-a.ext2
+	extract_shellball root-a.ext2 chromeos-firmwareupdate-${_board}
+
+	extract_coreboot chromeos-firmwareupdate-${_board}
+
+	../../${cbfstool} coreboot-*.bin extract -f mrc.bin \
+			-n mrc.bin -r RO_SECTION \
+					|| fail "Could not fetch mrc.bin"
+	rm -f "chromeos-firmwareupdate-${_board}" coreboot-*.bin \
+			"${_file}" "root-a.ext2"
+
+	printf "\n\nmrc.bin saved to ${_mrc_complete}\n\n"
+	)
+
+	return 0
+}
+
+download_image()
+{
+	url=${1}
+	_file=${2}
+	_sha1sum=${3}
+
+	echo "Downloading recovery image"
+	curl "$url" > "$_file.zip"
+	if [ "$(sha1sum ${_file}.zip | awk '{print $1}')" = "${_sha1sum}" ]
+	then
+		unzip -q "${_file}.zip"
+		rm "${_file}.zip"
+		echo "Checksum verification passed for recovery image."
+		return 0
+	else
+		rm "${_file}.zip"
+		echo "Bad checksum. Recovery image deleted."
+		return 1
+	fi
+}
+
+extract_partition()
+{
+	NAME=${1}
+	FILE=${2}
+	ROOTFS=${3}
+	_bs=1024
+
+	echo "Extracting ROOT-A partition"
+	ROOTP=$( printf "unit\nB\nprint\nquit\n" | \
+		 parted ${FILE} 2>/dev/null | grep ${NAME} )
+
+	START=$(( $( echo ${ROOTP} | cut -f2 -d\ | tr -d "B" ) ))
+	SIZE=$(( $( echo ${ROOTP} | cut -f4 -d\ | tr -d "B" ) ))
+
+	dd if=${FILE} of=${ROOTFS} bs=${_bs} skip=$(( ${START} / ${_bs} )) \
+		count=$(( ${SIZE} / ${_bs} ))  > /dev/null
+}
+
+extract_shellball()
+{
+	ROOTFS=${1}
+	SHELLBALL=${2}
+
+	echo "Extracting chromeos-firmwareupdate"
+	printf "cd /usr/sbin\ndump chromeos-firmwareupdate ${SHELLBALL}\nquit" \
+		| debugfs ${ROOTFS} > /dev/null 2>&1
+}
+
+extract_coreboot()
+{
+	_shellball=${1}
+	_unpacked=$( mktemp -d )
+
+	echo "Extracting coreboot image"
+	sh ${_shellball} --unpack ${_unpacked} > /dev/null
+
+	_version=$( cat ${_unpacked}/VERSION | grep BIOS\ version: | \
+			cut -f2 -d: | tr -d \  )
+
+	cp ${_unpacked}/bios.bin coreboot-${_version}.bin
+	rm -r "${_unpacked}"
+}
+
+fail()
+{
+	printf "%s: ERROR: %s\n"
+			${sname} ${1}
+	exit 1
+}
+
+main $@
diff --git a/resources/scripts/update/module/seabios b/resources/scripts/update/module/seabios
new file mode 100755
index 00000000..fd72de65
--- /dev/null
+++ b/resources/scripts/update/module/seabios
@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+#
+#   Copyright (C) 2015, 2016, 2021 Leah Rowe <info@minifree.org>
+#
+#	This program is free software: you can redistribute it and/or modify
+#	it under the terms of the GNU General Public License as published by
+#	the Free Software Foundation, either version 3 of the License, or
+#	(at your option) any later version.
+#
+#	This program is distributed in the hope that it will be useful,
+#	but WITHOUT ANY WARRANTY; without even the implied warranty of
+#	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#	GNU General Public License for more details.
+#
+#	You should have received a copy of the GNU General Public License
+#	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+[ "x${DEBUG+set}" = 'xset' ] && set -v
+set -u -e
+
+# Get SeaBIOS, revert to commit last used and apply patches.
+
+# Remove the old version that may still exist
+# ------------------------------------------------------------------------------
+
+printf "Downloading SeaBIOS\n"
+
+./gitclone seabios
diff --git a/resources/scripts/update/module/u-boot b/resources/scripts/update/module/u-boot
new file mode 100755
index 00000000..1af513a4
--- /dev/null
+++ b/resources/scripts/update/module/u-boot
@@ -0,0 +1,261 @@
+#!/usr/bin/env bash
+
+#  helper script: download u-boot
+#
+#	Copyright (C) 2021 Denis 'GNUtoo' Carikli  <GNUtoo@cyberdimension.org>
+#	Copyright (C) 2022 Alper Nebi Yasak <alpernebiyasak@gmail.com>
+#
+#	This program is free software: you can redistribute it and/or modify
+#	it under the terms of the GNU General Public License as published by
+#	the Free Software Foundation, either version 3 of the License, or
+#	(at your option) any later version.
+#
+#	This program is distributed in the hope that it will be useful,
+#	but WITHOUT ANY WARRANTY; without even the implied warranty of
+#	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#	GNU General Public License for more details.
+#
+#	You should have received a copy of the GNU General Public License
+#	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+[ "x${DEBUG+set}" = 'xset' ] && set -v
+set -u -e
+
+[[ -f build_error ]] && rm -f build_error
+
+list_supported_boards() {
+	for board in resources/u-boot/*; do
+		if [ -d ${board} ]; then
+			echo "${board#resources/u-boot/}"
+		fi
+	done
+}
+
+downloadfor() {
+	board="${1}"
+
+	# The loop will always exit, but this while loop is crafted
+	# such that a tree referencing a tree that references another tree is possible
+	# (and so on)
+	while true; do
+		ubrevision="undefined"
+		ubtree="undefined"
+
+		if [ ! -f "resources/u-boot/${board}/board.cfg" ]; then
+			printf "ERROR: %s: board.cfg does not exist for '%s'\n" \
+				"download/u-boot" "${board}"
+			return 1
+		fi
+
+		if [ -f "resources/u-boot/${board}/seen" ]; then
+			printf "ERROR: %s: logical loop; '%s' board.cfg refers to another tree, which ultimately refers back to '%s'.\n" \
+				"download/u-boot" "${board}" "${board}"
+			return 1
+		fi
+
+		# This is to override $ubrevision and $ubtree
+		source "resources/u-boot/${board}/board.cfg" || touch build_error
+		if [ -f build_error ]; then
+			printf "ERROR: %s: problem sourcing %s/board.cfg\n" \
+				"download/u-boot" "${board}"
+			return 1
+		fi
+		touch "resources/u-boot/${board}/seen"
+
+		if [ "${board}" != "${ubtree}" ]; then
+			board="${ubtree}"
+		else
+			if [ "${ubtree}" = "undefined" ]; then
+				printf "ERROR: %s: tree name undefined for '%s\n'" \
+					"download/u-boot" "${board}"
+				return 1
+			fi
+
+			if [ "${ubrevision}" = "undefined" ]; then
+				printf "ERROR: %s: commit ID undefined for '%s'\n" \
+					"download/u-boot" "${board}"
+				return 1
+			fi
+			break
+		fi
+	done
+
+	rm -f resources/u-boot/*/seen
+
+	ubtree="u-boot/${ubtree}"
+	if [ -d "${ubtree}" ]; then
+	    printf \
+		"REMARK: '%s' directory already exists. Skipping setup.\n" \
+		"${ubtree}"
+		if [ "${ubtree}" != "u-boot/${board}" ]; then
+			printf "(for board: '${board}')\n"
+		fi
+		return 0
+	fi
+
+	if [ ! -d "u-boot" ]; then
+		mkdir -p "u-boot"
+	fi
+
+	if [ ! -d "u-boot" ]; then
+		printf \
+			"ERROR: '%s' directory not created. Check file system permissions\n" \
+			"u-boot"
+		return 1
+	fi
+
+	uboot_dir="u-boot/u-boot"
+	if [ ! -d "${uboot_dir}/.git" ] && [ -d "${uboot_dir}" ]; then
+		rm -Rf "${uboot_dir}"
+	fi
+
+	if [ ! -d "${uboot_dir}" ]; then
+		printf "Download u-boot from upstream:\n"
+		git clone https://source.denx.de/u-boot/u-boot.git \
+		    "${uboot_dir}" || \
+		    rm -Rf "${uboot_dir}"
+		if [ ! -d "${uboot_dir}" ]; then
+			printf "WARNING: Upstream failed. Trying backup github repository:\n"
+			git clone https://github.com/u-boot/u-boot.git \
+				"${uboot_dir}" || \
+				rm -Rf coreboot
+		fi
+		if [ ! -d "${uboot_dir}" ]; then
+		    printf \
+			"ERROR: %s: Problem with git-clone. Network issue?\n" \
+			"download/u-boot"
+			return 1
+		fi
+	fi
+
+	git -C "${uboot_dir}" fetch origin "${ubrevision}" || touch build_error
+	if [ -f build_error ]; then
+	    printf \
+		"ERROR: %s: Problem with git-fetch. Network issue?\n" \
+		"download/u-boot"
+		return 1
+	fi
+
+	cp -R "${uboot_dir}" "${ubtree}" || touch build_error
+	if [ -f build_error ]; then
+		printf "ERROR: %s: Unable to copy directory. Check file system permissions or free space.\n" \
+			"download/u-boot"
+		rm -Rf "${ubtree}/"
+		return 1
+	fi
+
+	git -C "${ubtree}" reset --hard ${ubrevision} || \
+	    touch build_error
+	if [ -f build_error ]; then
+	    printf \
+		"ERROR: %s: Unable to reset to commit ID/tag '%s' for board '%s' on tree '%s'\n" \
+		"download/u-boot" "${ubrevision}" "${board}" "${ubtree}"
+		return 1
+	fi
+
+	git -C "${ubtree}" submodule update --init || touch build_error
+	if [ -f build_error ]; then
+		printf "ERROR: %s: Unable to update submodules for tree '%s'\n" \
+			"${ubtree}"
+		return 1
+	fi
+
+	for patch in resources/u-boot/${board}/patches/*.patch; do
+		if [ ! -f "${patch}" ]; then
+			continue
+		fi
+
+		git -C "${ubtree}" am "$(pwd)/${patch}" || touch build_error
+		if [ -f build_error ]; then
+			printf "ERROR: %s: Unable to apply patch '%s' for board '%s' on tree '%s'" \
+				"download/u-boot" "${patch}" "${board}" "${ubtree}"
+			git -C "${ubtree}" am --abort
+			return 1
+		fi
+	done
+
+	# extra.sh could be used to patch submodules, if you wanted to
+	# It's impossible to predict what submodules will be available, and
+	# it's rare that you'd want to patch them, so this is handled by
+	# extra.sh on a per-board basis
+	# In fact, extra.sh can be used for anything you want.
+	if [ -f "resources/u-boot/${board}/extra.sh" ]; then
+		( cd "${ubtree}" && "../../resources/u-boot/${board}/extra.sh"; ) || touch build_error
+		if [ -f build_error ]; then
+			return 1
+		fi
+		return 0
+	else
+		return 0
+	fi
+}
+
+strip_comments()
+{
+	file="$1"
+	# Remove comments
+	sed 's/#.*//' "${file}" | \
+	    # Remove lines composed of whitespaces only
+	    sed '/^\W\+$/d' | \
+		# Remove empty lines
+		sed '/^$/d'
+}
+
+usage()
+{
+	progname="./download u-boot"
+
+	printf "Usage:\n"
+	printf "\t%s                                # %s\n" \
+	       "${progname}" \
+	       "Download u-boot for all boards"
+	printf "\t%s [board]                        # %s\n" \
+	       "${progname}" \
+	       "Download u-boot for the given board"
+	printf "\t%s --list-boards                  # %s\n" \
+	       "${progname}" \
+	       "List supported boards"
+	printf "\t%s --help                         # %s\n" \
+	       "${progname}" \
+	       "Prints this help"
+}
+
+download_uboot_board()
+{
+	board="${1}"
+	ubtree="u-boot/${board}"
+
+	printf "Downloading u-boot "
+	printf "and (if exist in build system) applying patches\n"
+	downloadfor "${board}"
+
+	rm -f "build_error"
+	printf "\n\n"
+}
+
+if [ $# -eq 0 ] ; then
+	for board in $(list_supported_boards); do
+		download_uboot_board "${board}"
+	done
+	exit 0
+elif [ $# -eq 1 -a "$1" == "--help" ] ; then
+	usage
+	exit 0
+elif [ $# -eq 1 -a "$1" == "--list-boards" ] ; then
+	list_supported_boards
+	exit 0
+elif [ $# -eq 1 ] ; then
+	for board in $(list_supported_boards) ; do
+		if [ "$board" = "$1" ] ; then
+			download_uboot_board "$1"
+			exit 0
+		fi
+	done
+
+	printf "Error: Board '${1}' is not supported\n"
+
+	exit 1
+fi
+
+exit 0