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#
# Build and Setup RPi2 Kernel
#
# Load utility functions
. ./functions.sh
# Fetch and build latest raspberry kernel
if [ "$BUILD_KERNEL" = true ] ; then
# Setup source directory
mkdir -p "$R/usr/src"
# Copy existing kernel sources into chroot directory
if [ -n "$KERNELSRC_DIR" ] && [ -d "$KERNELSRC_DIR" ] ; then
# Copy kernel sources
cp -r "${KERNELSRC_DIR}" "${R}/usr/src"
# Clean the kernel sources
if [ "$KERNELSRC_CLEAN" = true ] && [ "$KERNELSRC_PREBUILT" = false ] ; then
make -C "$R/usr/src/linux" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" mrproper
fi
else # KERNELSRC_DIR=""
# Fetch current raspberrypi kernel sources
git -C "$R/usr/src" clone --depth=1 https://github.com/raspberrypi/linux
fi
# Calculate optimal number of kernel building threads
if [ "$KERNEL_THREADS" = "1" ] && [ -r /proc/cpuinfo ] ; then
KERNEL_THREADS=$(grep -c processor /proc/cpuinfo)
fi
if [ "$KERNELSRC_PREBUILT" = false ] ; then
if [ "$KERNELSRC_CONFIG" = true ] ; then
# Load default raspberry kernel configuration
make -C "$R/usr/src/linux" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" "${KERNEL_DEFCONFIG}"
# Start menu-driven kernel configuration (interactive)
if [ "$KERNEL_MENUCONFIG" = true ] ; then
make -C "$R/usr/src/linux" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" menuconfig
fi
fi
# Cross compile kernel and modules
make -C "$R/usr/src/linux" -j${KERNEL_THREADS} ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" zImage modules dtbs
fi
# Check if kernel compilation was successful
if [ ! -r "$R/usr/src/linux/arch/${KERNEL_ARCH}/boot/zImage" ] ; then
echo "error: kernel compilation failed! (zImage not found)"
cleanup
exit 1
fi
# Install kernel modules
if [ "$ENABLE_REDUCE" = true ] ; then
make -C "$R/usr/src/linux" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" INSTALL_MOD_STRIP=1 INSTALL_MOD_PATH=../../.. modules_install
else
make -C "$R/usr/src/linux" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" INSTALL_MOD_PATH=../../.. modules_install
# Install kernel firmware
make -C "$R/usr/src/linux" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" INSTALL_FW_PATH=../../../lib firmware_install
fi
# Install kernel headers
if [ "$KERNEL_HEADERS" = true ] ; then
make -C "$R/usr/src/linux" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" INSTALL_HDR_PATH=../.. headers_install
fi
# Prepare boot (firmware) directory
mkdir "$R/boot/firmware/"
# Get kernel release version
KERNEL_VERSION=`cat "$R/usr/src/linux/include/config/kernel.release"`
# Copy kernel configuration file to the boot directory
cp "$R/usr/src/linux/.config" "$R/boot/config-${KERNEL_VERSION}"
# Copy dts and dtb device tree sources and binaries
mkdir "$R/boot/firmware/overlays/"
cp "$R/usr/src/linux/arch/${KERNEL_ARCH}/boot/dts/"*.dtb "$R/boot/firmware/"
cp "$R/usr/src/linux/arch/${KERNEL_ARCH}/boot/dts/overlays/"*.dtb* "$R/boot/firmware/overlays/"
cp "$R/usr/src/linux/arch/${KERNEL_ARCH}/boot/dts/overlays/README" "$R/boot/firmware/overlays/"
# Convert kernel zImage and copy it to the boot directory
"$R/usr/src/linux/scripts/mkknlimg" "$R/usr/src/linux/arch/${KERNEL_ARCH}/boot/zImage" "$R/boot/firmware/kernel7.img"
# Remove kernel sources
if [ "$KERNEL_REMOVESRC" = true ] ; then
rm -fr "$R/usr/src/linux"
fi
# Install raspberry bootloader and flash-kernel packages
chroot_exec apt-get -qq -y --no-install-recommends install raspberrypi-bootloader-nokernel
else # BUILD_KERNEL=false
# Kernel installation
chroot_exec apt-get -qq -y --no-install-recommends install linux-image-"${COLLABORA_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
# Setup firmware boot cmdline
if [ "$ENABLE_SPLITFS" = true ] ; then
CMDLINE="dwc_otg.lpm_enable=0 root=/dev/sda1 rootfstype=ext4 rootflags=commit=100,data=writeback elevator=deadline rootwait net.ifnames=1 console=tty1 ${CMDLINE}"
else
CMDLINE="dwc_otg.lpm_enable=0 root=/dev/mmcblk0p2 rootfstype=ext4 rootflags=commit=100,data=writeback elevator=deadline rootwait net.ifnames=1 console=tty1 ${CMDLINE}"
fi
# Add serial console support
if [ "$ENABLE_CONSOLE" = true ] ; then
CMDLINE="${CMDLINE} console=ttyAMA0,115200 kgdboc=ttyAMA0,115200"
fi
# Remove IPv6 networking support
if [ "$ENABLE_IPV6" = false ] ; then
CMDLINE="${CMDLINE} ipv6.disable=1"
fi
# Install firmware boot cmdline
echo "${CMDLINE}" > "$R/boot/firmware/cmdline.txt"
# Install firmware config
install_readonly files/boot/config.txt "$R/boot/firmware/config.txt"
# Setup minimal GPU memory allocation size: 16MB (no X)
if [ "$ENABLE_MINGPU" = true ] ; then
echo "gpu_mem=16" >> "$R/boot/firmware/config.txt"
fi
# Create firmware configuration and cmdline symlinks
ln -sf firmware/config.txt "$R/boot/config.txt"
ln -sf firmware/cmdline.txt "$R/boot/cmdline.txt"
# Install and setup kernel modules to load at boot
mkdir -p "$R/lib/modules-load.d/"
install_readonly files/modules/rpi2.conf "$R/lib/modules-load.d/rpi2.conf"
# Load hardware random module at boot
if [ "$ENABLE_HWRANDOM" = true ] ; then
sed -i "s/^# bcm2708_rng/bcm2708_rng/" "$R/lib/modules-load.d/rpi2.conf"
fi
# Load sound module at boot
if [ "$ENABLE_SOUND" = true ] ; then
sed -i "s/^# snd_bcm2835/snd_bcm2835/" "$R/lib/modules-load.d/rpi2.conf"
fi
# Install kernel modules blacklist
mkdir -p "$R/etc/modprobe.d/"
install_readonly files/modules/raspi-blacklist.conf "$R/etc/modprobe.d/raspi-blacklist.conf"
# Install and setup fstab
install_readonly files/mount/fstab "$R/etc/fstab"
if [ "$ENABLE_SPLITFS" = true ] ; then
sed -i 's/mmcblk0p2/sda1/' "$R/etc/fstab"
fi
# Install sysctl.d configuration files
install_readonly files/sysctl.d/81-rpi-vm.conf "$R/etc/sysctl.d/81-rpi-vm.conf"
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