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

UBOOTDIR="${1}" # For example "u-boot"
DEFCONFIG="${2}" # For example "rpi_3_defconfig"
TUPLE="${3}" # For example "aarch64-linux-gnu"

set -e

# U-Boot version to build
VERSION=$(git ls-remote --tags --refs "git://git.denx.de/u-boot.git" "v????.??" | \
          cut -f 2 | \
          grep -o "v....\..." | \
          tail -n 1)

# Download U-Boot
git clone --branch "$VERSION" \
          --depth 1 \
          --reference-if-able "/tmp/debimg/u-boot.git" \
          --dissociate \
          "git://git.denx.de/u-boot.git" "${UBOOTDIR}"

# Step into U-Boot directory
cd "${UBOOTDIR}"

# 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