#!/bin/sh
# Download and build latest version of U-Boot

DEFCONFIG="${1}" # For example "rpi_3_defconfig"
TUPLE="${2}" # For example "aarch64-linux-gnu"

TARBALL="${U_BOOT_TARBALL}"
GIT_REV="${U_BOOT_GIT_REV}"
GIT_URL="${U_BOOT_GIT_URL:-git://git.denx.de/u-boot.git}"

set -e

if [ ! -s "${TARBALL}" ]
then
	if [ -z "${GIT_REV}" ]
	then
		# U-Boot version to build
		GIT_REV=$(git ls-remote --tags \
		                        --refs \
		                        "${GIT_URL}" \
		                        "v????.??" | \
		          cut -f 2 | \
		          grep -o "v....\..." | \
		          tail -n 1)
	fi

	# Download U-Boot
	git clone --branch "${GIT_REV}" \
	          --depth 1 \
	          "${GIT_URL}" u-boot
else
	# Extract U-Boot
	tar -xf "${TARBALL}"

	mv u-boot-????.?? u-boot
fi

# Step into U-Boot directory
cd u-boot

# Setup ARCH
case "${TUPLE}" in
arm-*)
	export ARCH="arm"
	;;
aarch64-*)
	export ARCH="aarch64"
	;;
*)
	echo "Can't decide \$ARCH for tuple \"${TUPLE}\""
	exit 1
	;;
esac

# CROSS_COMPILE must point to a valid compiler path prefix
export CROSS_COMPILE=$(dirname $(which "${TUPLE}-gcc"))/"${TUPLE}-"

# Build U-Boot
make "${DEFCONFIG}" && make