build-kernel

#!/usr/bin/env bash
# shellcheck disable=SC2199
# shellcheck source=/dev/null
#
# Copyright (C) 2020-22 UtsavBalar1231 <utsavbalar1231@gmail.com>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Enviromental Variables
DATE=$(date +"%d.%m.%y")

OUT_DIR=$(pwd)/out

# Packages required to compile are:
# bc bison flex build-essential gcc libssl-dev libncurses5-dev

#PATH=$HOME/gcc-arm64/bin:$HOME/gcc-arm/bin:$PATH
FILENAME="${OUT_DIR}/boot-${DATE}.img"
KERNEL_IMAGE="${OUT_DIR}/arch/arm64/boot/Image"
DTB_FILE="${OUT_DIR}/arch/arm64/boot/dts/rockchip/rk3399-rockpi4b.dtb"

if [[ "$@" =~ "rockpro"* ]]; then
	DTB_FILE="${OUT_DIR}/arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dtb"
fi

# Pack Image into boot image
function pack_image() {
	mkfs.vfat -n "boot" -S 512 -C $FILENAME $((50 * 1024))

	if [ -d $(pwd)/extlinux ]; then
		cp -r $(pwd)/extlinux/ $OUT_DIR
	else
		echo "Extlinux directory does not exist!"
	fi

	cd $OUT_DIR || exit

	if [ -f $(which mmd) ]; then
		mmd -i $FILENAME ::/extlinux
		mcopy -i $FILENAME -s $EXTLINUX_CONF ::/extlinux/extlinux.conf
		mcopy -i $FILENAME -s $KERNEL_IMAGE ::
		mcopy -i $FILENAME -s $DTB_FILE ::/rk3399-vaaman-rev01.dtb
	else
		echo "install mtools!"
	fi
}

# Cleanup previous build files
function cleanup() {
	if [ -f ${FILENAME} ]; then
		rm -f ${FILENAME}
	fi
	if [ -f ${KERNEL_IMAGE} ]; then
		rm -f ${KERNEL_IMAGE}
	fi
	if [ -f ${DTB_FILE} ]; then
		rm -f ${DTB_FILE}
	fi
	if [ -d ${OUT_DIR}/extlinux ]; then
		rm -rf ${OUT_DIR}/extlinux
	fi
}

ARGS="ARCH=arm64 \
O=${OUT_DIR} \
CROSS_COMPILE=aarch64-linux-gnu- \
-j$(nproc --all)"

if [[ "$@" =~ "debian"* ]]; then
	echo -e "###### USING DEBIAN EXTLINUX CONFIG #####"
	EXTLINUX_CONF=extlinux/rk3399-debian.conf
elif [[ "$@" =~ "debian11"* ]]; then
	echo -e "###### USING DEBIAN 11 EXTLINUX CONFIG #####"
	EXTLINUX_CONF=extlinux/rk3399.conf
elif [[ "$@" =~ "rockpro"* ]]; then
	echo -e "###### USING MANJARO ROCKPRO EXTLINUX CONFIG #####"
	EXTLINUX_CONF=extlinux/rk3399-rockpro.conf
else
	echo -e "###### USING MANJARO EXTLINUX CONFIG #####"
	EXTLINUX_CONF=extlinux/rk3399-manjaro.conf
fi

# Cleanup previous build
cleanup

# Make defconfig
make -j$(nproc --all) ${ARGS} rockchip_linux_defconfig

# Make kernel Image
if [ -f $(which ccache) ]; then
	CROSS_COMPILE="aarch64-linux-gnu-"
	make -j$(nproc --all) ${ARGS} CC="ccache ${CROSS_COMPILE}gcc" 2>&1 | tee build.log
else
	make -j$(nproc --all) ${ARGS} 2>&1 | tee build.log

fi

# Create boot image
pack_image

if [ -f ${FILENAME} ]; then
	echo "Kernel compiled successfully!"
else
	echo "Kernel build failed!"
fi