build/payload: Add helper script to build U-Boot as payload
This enables building U-Boot for boards which have config files in resources/u-boot, and copying built files that could be usable to make coreboot payloads. Right now, there is no such board in this repo. The most important file here is "u-boot.elf", which is a combination of the U-Boot binary and the appropriate device-tree file for the board. Building this needs CONFIG_REMAKE_ELF=y on the U-Boot part, and using this with CONFIG_PAYLOAD_ELF=y on the coreboot build works fine. Note that this isn't enough to make U-Boot-only releases, since low-level prerequisites like arm-trusted-firmware aren't passed in to the U-Boot build system. Coreboot builds its own copy of TF-A and sets it up on the board, so using these U-Boot builds as payloads should still work. Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>
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Alper Nebi Yasak
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GPG Key ID:
5F5DFCC14177E263
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#!/usr/bin/env bash
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# helper script: builds U-Boot source code
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#
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# Copyright (C) 2020, 2021 Leah Rowe <info@minifree.org>
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# Copyright (C) 2021 Vitali64 <vitali64pmemail@protonmail.com>
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# Copyright (C) 2022 Alper Nebi Yasak <alpernebiyasak@gmail.com>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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[ "x${DEBUG+set}" = 'xset' ] && set -v
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set -u -e
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RET=0
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# Build U-Boot
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# ---------------------------------------------------------------------
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printf "Building U-Boot payloads\n"
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# Build for all boards if no argument is given
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if [ "$#" -eq 0 ]; then
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for board_dir in resources/u-boot/*; do
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if [ -d "${board_dir}/config/" ]; then
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set -- "$@" "${board_dir#resources/u-boot/}"
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fi
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done
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fi
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[ ! -d "payload/" ] && mkdir -p payload/
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[ ! -d "payload/u-boot" ] && mkdir -p payload/u-boot/
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# Appends additional version info to U-Boot
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our_version="$(cat version)"
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projectname="$(cat projectname)"
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export LOCALVERSION="-${projectname}-${our_version}"
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for board in "$@"; do
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board_dir="resources/u-boot/${board}"
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rm -rf "payload/u-boot/${board}"
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mkdir -p "payload/u-boot/${board}"
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ubtree="undefined"
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arch="undefined"
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if [ ! -f "${board_dir}/board.cfg" ]; then
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printf "%s: Target %s does not have a board.cfg. Skipping build.\n" \
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"build/payload/u-boot" "${board}"
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RET=1
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continue
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fi
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# Override the above defaults using board.cfg
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source "${board_dir}/board.cfg"
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if [ "${ubtree}" = "undefined" ]; then
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printf "%s: Target %s does not define a U-Boot tree. Skipping build.\n" \
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"build/payload/u-boot" "${board}"
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RET=1
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continue
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fi
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if [ "${arch}" = "undefined" ]; then
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printf "%s: Target %s does not define a CPU type. Skipping build.\n" \
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"build/payload/u-boot" "${board}"
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RET=1
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continue
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fi
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ubdir="u-boot/${board}"
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if [ "${board}" != "${ubtree}" ]; then
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ubdir="u-boot/${ubtree}"
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fi
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if [ ! -d "${ubdir}" ]; then
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./download u-boot "$board"
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fi
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if [ ! -d "${ubdir}" ]; then
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printf "%s: Failed to download U-Boot for target %s. Skipping build.\n" \
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"build/payload/u-boot" "${board}"
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RET=1
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continue
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fi
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if [ "${arch}" = "x86_32" ] || [ "${arch}" = "x86_64" ]; then
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export CROSS_COMPILE=x86_64-linux-
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elif [ "${arch}" = "ARMv7" ]; then
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export CROSS_COMPILE=arm-linux-gnueabi-
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elif [ "${arch}" = "AArch64" ]; then
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export CROSS_COMPILE=aarch64-linux-gnu-
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fi
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for config in "${board_dir}/config"/*; do
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if [ ! -f "${config}" ]; then
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printf "%s: Target %s has no configs to build for. Skipping build.\n" \
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"build/payload/u-boot" "${board}"
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RET=1
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continue
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fi
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config_name="${config#$board_dir/config/}"
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if [ "$config_name" = "default" ]; then
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dest_dir="payload/u-boot/${board}"
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else
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dest_dir="payload/u-boot/${board}/${config_name}"
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fi
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mkdir -p "${dest_dir}"
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printf "%s: Building for target %s (config %s).\n" \
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"build/payload/u-boot" "${board}" "${config_name}"
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make -C "${ubdir}" distclean
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cp "${config}" "${ubdir}/.config"
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make -C "${ubdir}" olddefconfig
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make -C "${ubdir}" -j"$(nproc)" all
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for f in "${ubdir}"/u-boot{,.bin,.dtb,.img,.itb,.elf}; do
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if [ -f "$f" ]; then
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mv "$f" "${dest_dir}/"
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fi
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done
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make -C "${ubdir}" distclean
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printf "%s: Built for target %s (config %s).\n" \
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"build/payload/u-boot" "${board}" "${config_name}"
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done
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done
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printf "Done! U-Boot files are in payload/u-boot/\n\n"
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exit $RET
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# ------------------- DONE ----------------------
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