sd-card-images/scripts/build-u_boot

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#!/bin/sh
# Download and build latest version of U-Boot
DEFCONFIG="${1}" # For example "rpi_3_defconfig"
TUPLE="${2}" # For example "aarch64-linux-gnu"
set -ex
U_BOOT_GIT_URL_DEFAULT="https://source.denx.de/u-boot/u-boot.git/"
if [ ! -z "${U_BOOT_GIT_REV}" ]
then
git clone --depth 1 \
--reference-if-able "${WORKDIR}/u-boot" \
--branch "${U_BOOT_GIT_REV}" \
"${U_BOOT_GIT_URL:-${U_BOOT_GIT_URL_DEFAULT}}" u-boot
else
git clone --depth 1 \
--reference-if-able "${WORKDIR}/u-boot" \
"${U_BOOT_GIT_URL:-${U_BOOT_GIT_URL_DEFAULT}}" u-boot
fi
# Collect version of U-Boot
(echo -n u-boot,; git -C u-boot describe --tags --always --abbrev=10) >> versions.csv
# Step into U-Boot directory
cd u-boot
# Apply patches
if [ -d "${U_BOOT_PATCHES_DIR}" ]; then
git apply "${U_BOOT_PATCHES_DIR}"/*.patch || :
fi
# Set localversion
export LOCALVERSION="johang"
# CROSS_COMPILE must point to a valid compiler path prefix
export CROSS_COMPILE=$(dirname $(which "${TUPLE}-gcc"))/"${TUPLE}-"
# Build U-Boot
make ${MAKEFLAGS} "${DEFCONFIG}" && make ${MAKEFLAGS:--j$(nproc)}