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#
# Kernel installation
#
. ./functions.sh
# Fetch and build latest raspberry kernel
if [ "$BUILD_KERNEL" = true ] ; then
# Fetch current raspberrypi kernel sources
git -C $R/usr/local/src clone --depth=1 https://github.com/raspberrypi/linux
# Load default raspberry kernel configuration
make -C $R/usr/local/src/linux ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- bcm2709_defconfig
# Cross compile kernel and modules
make -C $R/usr/local/src/linux -j$(grep -c processor /proc/cpuinfo) ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- zImage modules dtbs
# Install kernel modules
make -C $R/usr/local/src/linux ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- INSTALL_MOD_PATH=../.. modules_install
# Install kernel headers
if [ "$KERNEL_HEADERS" = true ]; then
make -C $R/usr/local/src/linux ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- INSTALL_HDR_PATH=../../usr headers_install
fi
# Copy and rename compiled kernel to boot directory
mkdir $R/boot/firmware/
$R/usr/local/src/linux/scripts/mkknlimg $R/usr/local/src/linux/arch/arm/boot/zImage $R/boot/firmware/kernel7.img
# Copy dts and dtb device definitions
mkdir $R/boot/firmware/overlays/
cp $R/usr/local/src/linux/arch/arm/boot/dts/*.dtb $R/boot/firmware/
cp $R/usr/local/src/linux/arch/arm/boot/dts/overlays/*.dtb* $R/boot/firmware/overlays/
cp $R/usr/local/src/linux/arch/arm/boot/dts/overlays/README $R/boot/firmware/overlays/
# Install raspberry bootloader and flash-kernel
chroot_exec apt-get -qq -y --no-install-recommends install raspberrypi-bootloader-nokernel
else
# Kernel installation
chroot_exec apt-get -qq -y --no-install-recommends install linux-image-${KERNEL} raspberrypi-bootloader-nokernel
# Install flash-kernel last so it doesn't try (and fail) to detect the platform in the chroot
chroot_exec apt-get -qq -y install flash-kernel
VMLINUZ="$(ls -1 $R/boot/vmlinuz-* | sort | tail -n 1)"
[ -z "$VMLINUZ" ] && exit 1
cp $VMLINUZ $R/boot/firmware/kernel7.img
fi
# Set up firmware boot cmdline
CMDLINE="dwc_otg.lpm_enable=0 root=/dev/mmcblk0p2 rootfstype=ext4 rootflags=commit=100,data=writeback elevator=deadline rootwait net.ifnames=1 console=tty1"
# Set up serial console support (if requested)
if [ "$ENABLE_CONSOLE" = true ] ; then
CMDLINE="${CMDLINE} console=ttyAMA0,115200 kgdboc=ttyAMA0,115200"
fi
# Set up IPv6 networking support
if [ "$ENABLE_IPV6" = false ] ; then
CMDLINE="${CMDLINE} ipv6.disable=1"
fi
echo "${CMDLINE}" >$R/boot/firmware/cmdline.txt
# Set up firmware config
install -o root -g root -m 644 files/config.txt $R/boot/firmware/config.txt
# Load snd_bcm2835 kernel module at boot time
if [ "$ENABLE_SOUND" = true ] ; then
echo "snd_bcm2835" >>$R/etc/modules
fi
# Set smallest possible GPU memory allocation size: 16MB (no X)
if [ "$ENABLE_MINGPU" = true ] ; then
echo "gpu_mem=16" >>$R/boot/firmware/config.txt
fi
# Create symlinks
ln -sf firmware/config.txt $R/boot/config.txt
ln -sf firmware/cmdline.txt $R/boot/cmdline.txt
# Prepare modules-load.d directory
mkdir -p $R/lib/modules-load.d/
# Load random module on boot
if [ "$ENABLE_HWRANDOM" = true ] ; then
cat <<EOM >$R/lib/modules-load.d/rpi2.conf
bcm2708_rng
EOM
fi
# Prepare modprobe.d directory
mkdir -p $R/etc/modprobe.d/
# Blacklist sound modules
install -o root -g root -m 644 files/modprobe.d/raspi-blacklist.conf $R/etc/modprobe.d/raspi-blacklist.conf
# Create default fstab
install -o root -g root -m 644 files/fstab $R/etc/fstab
# Avoid swapping and increase cache sizes
install -o root -g root -m 644 files/sysctl.d/81-rpi-vm.conf $R/etc/sysctl.d/81-rpi-vm.conf
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