#!/bin/sh 

# https://github.com/LeeKyuHyuk/PiCLFS/blob/raspberry-pi-3/04-build-kernel.sh
# https://intestinate.com/pilfs/beyond.html#kernelbuild

. $BUILDVARS

BUILD=1sml
APP=rpikernel
VERSION=4.19.75
TARBALL="raspberrypi-kernel_1.20190925-1"
PKG=$TMP/package-$APP

rm -rf $PKG
mkdir -p $PKG $PKGDEST

cd $TMP
rm -rf $APP-$VERSION

# keep it quiet, since it's a lonnng list
tar xf $CWD/$TARBALL.tar.?z || exit 1
cd linux-"$TARBALL" || exit 1

# the kernel should appear exactly as the official one
#sed -i 's/EXTRAVERSION =.*/EXTRAVERSION = +/' Makefile

mkdir -p $PKG/{boot,lib}

# for the raspberry pi 1
make ARCH=arm bcmrpi_defconfig
make $jobs ARCH=arm || make $jobs ARCH=arm || exit 1
make $jobs ARCH=arm zImage modules dtbs || exit 1 
cp -v arch/arm/boot/zImage $PKG/boot/kernel.img || exit 1
make ARCH=arm INSTALL_MOD_PATH="$PKG" modules_install || exit 1
#make clean

# for the raspberry pi 2 & 3
make ARCH=arm bcm2709_defconfig
make $jobs ARCH=arm || make $jobs ARCH=arm || exit 1
make $jobs ARCH=arm zImage modules dtbs || exit 1
cp -v arch/arm/boot/zImage $PKG/boot/kernel7.img || exit 1
make ARCH=arm INSTALL_MOD_PATH="$PKG" modules_install || exit 1
#make clean

# for the raspberry pi 4
make ARCH=arm bcm2711_defconfig
make $jobs ARCH=arm || make $jobs ARCH=arm || exit 1
make $jobs ARCH=arm zImage modules dtbs || exit 1
cp -v arch/arm/boot/zImage $PKG/boot/kernel7l.img || exit 1
make ARCH=arm INSTALL_MOD_PATH="$PKG" modules_install || exit 1

# Copy the dtb files into /boot
mkdir -p $PKG/boot/overlays
cp -v arch/arm/boot/dts/*.dtb $PKG/boot/
cp -v arch/arm/boot/dts/overlays/*.dtb* $PKG/boot/overlays

# Copy the headers into /usr
mkdir -p $PKG
make ARCH=arm INSTALL_HDR_PATH="$PKG" headers_install || exit 1

cp -r $CWD/boot/* $PKG/boot/
chmod +x $PKG/boot/* 

cd $PKG/include 
find . -name ".install" | xargs rm -f - 

cd $PKG
/bin/makepkg -l y -c n $PKGDEST/$APP-$VERSION-$ARCH-$BUILD.tgz