#!/bin/bash

set -e

function usage {

    cat <<EOF

Compile Kernel for MNT Reform
---
This script compile Linux kernel for the MNT Reform2 laptop.

USAGE:
make_kernel.sh <version>

<version> : kernel version to compile. This argument is not require if you
define KERNEL_VERSION environment variable.
EOF

}

function error {
    >&2 printf "\e[31mE\e[0m %s\n" "$1"
}

export ARCH=arm64
#export LOADADDR=0x40480000
export CROSS_COMPILE=aarch64-linux-gnu-
GIT_URL="https://github.com/torvalds/linux/"

if [ ! -z $1 ]
then
    KERNEL_VERSION="$1"
fi

if [ -z "$KERNEL_VERSION" ]
then
    error "You need to define KERNEL_VERSION env variable"
    usage
    exit 10
fi

if [ ! -d linux ]
then
    printf "Cloning Linux...\n"
    # temporary linux 5.11rc7 commit
    if ! git clone --depth 1 --branch=v${KERNEL_VERSION} $GIT_URL
    then
        error "Can't clone Linux, check version"
        exit 11
    fi
fi

cp ./dts/*.dts ./linux/arch/arm64/boot/dts/freescale/
cp ./kernel-config ./linux/.config

cd linux

for PATCHFILE in ../patches/*.patch
do
    printf "Apply patch %s\n" $PATCHFILE
    if git apply --check $PATCHFILE
    then
        git apply $PATCHFILE
    else
        error "Kernel patch already applied or cannot apply: $PATCHFILE"
    fi
done

make -j$(nproc) Image freescale/imx8mq-mnt-reform2.dtb freescale/imx8mq-mnt-reform2-hdmi.dtb
cd ..

exit 0