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#
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# Build and Setup RPi2/3 Kernel
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#
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# Load utility functions
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. ./functions.sh
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# Fetch and build latest raspberry kernel
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if [ "$BUILD_KERNEL" = true ] ; then
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# Setup source directory
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mkdir -p "${R}/usr/src/linux"
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# Copy existing kernel sources into chroot directory
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if [ -n "$KERNELSRC_DIR" ] && [ -d "$KERNELSRC_DIR" ] ; then
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# Copy kernel sources and include hidden files
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cp -r "${KERNELSRC_DIR}/". "${R}/usr/src/linux"
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# Clean the kernel sources
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if [ "$KERNELSRC_CLEAN" = true ] && [ "$KERNELSRC_PREBUILT" = false ] ; then
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make -C "${KERNEL_DIR}" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" mrproper
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fi
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else # KERNELSRC_DIR=""
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# Create temporary directory for kernel sources
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temp_dir=$(as_nobody mktemp -d)
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# Fetch current RPi2/3 kernel sources
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if [ -z "${KERNEL_BRANCH}" ] ; then
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as_nobody -H git -C "${temp_dir}" clone --depth=1 "${KERNEL_URL}" linux
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else
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as_nobody -H git -C "${temp_dir}" clone --depth=1 --branch "${KERNEL_BRANCH}" "${KERNEL_URL}" linux
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fi
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# Copy downloaded kernel sources
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cp -r "${temp_dir}/linux/"* "${R}/usr/src/linux/"
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# Remove temporary directory for kernel sources
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rm -fr "${temp_dir}"
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# Set permissions of the kernel sources
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chown -R root:root "${R}/usr/src"
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fi
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# Calculate optimal number of kernel building threads
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if [ "$KERNEL_THREADS" = "1" ] && [ -r /proc/cpuinfo ] ; then
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KERNEL_THREADS=$(grep -c processor /proc/cpuinfo)
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fi
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# Configure and build kernel
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if [ "$KERNELSRC_PREBUILT" = false ] ; then
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# Remove device, network and filesystem drivers from kernel configuration
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if [ "$KERNEL_REDUCE" = true ] ; then
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make -C "${KERNEL_DIR}" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" "${KERNEL_DEFCONFIG}"
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sed -i\
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-e "s/\(^CONFIG_SND.*\=\).*/\1n/"\
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-e "s/\(^CONFIG_SOUND.*\=\).*/\1n/"\
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-e "s/\(^CONFIG_AC97.*\=\).*/\1n/"\
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-e "s/\(^CONFIG_VIDEO_.*\=\).*/\1n/"\
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-e "s/\(^CONFIG_MEDIA_TUNER.*\=\).*/\1n/"\
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-e "s/\(^CONFIG_DVB.*\=\)[ym]/\1n/"\
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-e "s/\(^CONFIG_REISERFS.*\=\).*/\1n/"\
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-e "s/\(^CONFIG_JFS.*\=\).*/\1n/"\
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-e "s/\(^CONFIG_XFS.*\=\).*/\1n/"\
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-e "s/\(^CONFIG_GFS2.*\=\).*/\1n/"\
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-e "s/\(^CONFIG_OCFS2.*\=\).*/\1n/"\
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-e "s/\(^CONFIG_BTRFS.*\=\).*/\1n/"\
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-e "s/\(^CONFIG_HFS.*\=\).*/\1n/"\
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-e "s/\(^CONFIG_JFFS2.*\=\)[ym]/\1n/"\
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-e "s/\(^CONFIG_UBIFS.*\=\).*/\1n/"\
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-e "s/\(^CONFIG_SQUASHFS.*\=\)[ym]/\1n/"\
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-e "s/\(^CONFIG_W1.*\=\)[ym]/\1n/"\
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-e "s/\(^CONFIG_HAMRADIO.*\=\).*/\1n/"\
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-e "s/\(^CONFIG_CAN.*\=\).*/\1n/"\
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-e "s/\(^CONFIG_IRDA.*\=\).*/\1n/"\
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-e "s/\(^CONFIG_BT_.*\=\).*/\1n/"\
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-e "s/\(^CONFIG_WIMAX.*\=\)[ym]/\1n/"\
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-e "s/\(^CONFIG_6LOWPAN.*\=\).*/\1n/"\
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-e "s/\(^CONFIG_IEEE802154.*\=\).*/\1n/"\
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-e "s/\(^CONFIG_NFC.*\=\).*/\1n/"\
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-e "s/\(^CONFIG_FB_TFT=.*\=\).*/\1n/"\
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-e "s/\(^CONFIG_TOUCHSCREEN.*\=\).*/\1n/"\
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-e "s/\(^CONFIG_USB_GSPCA_.*\=\).*/\1n/"\
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-e "s/\(^CONFIG_DRM.*\=\).*/\1n/"\
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"${KERNEL_DIR}/.config"
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fi
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if [ "$KERNELSRC_CONFIG" = true ] ; then
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# Load default raspberry kernel configuration
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make -C "${KERNEL_DIR}" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" "${KERNEL_DEFCONFIG}"
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# Set kernel configuration parameters to enable qemu emulation
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if [ "$ENABLE_QEMU" = true ] ; then
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echo "CONFIG_FHANDLE=y" >> ${KERNEL_DIR}/.config
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echo "CONFIG_LBDAF=y" >> ${KERNEL_DIR}/.config
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if [ "$ENABLE_CRYPTFS" = true ] ; then
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echo "CONFIG_EMBEDDED=y" >> ${KERNEL_DIR}/.config
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echo "CONFIG_EXPERT=y" >> ${KERNEL_DIR}/.config
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echo "CONFIG_DAX=y" >> ${KERNEL_DIR}/.config
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echo "CONFIG_MD=y" >> ${KERNEL_DIR}/.config
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echo "CONFIG_BLK_DEV_MD=y" >> ${KERNEL_DIR}/.config
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echo "CONFIG_MD_AUTODETECT=y" >> ${KERNEL_DIR}/.config
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echo "CONFIG_BLK_DEV_DM=y" >> ${KERNEL_DIR}/.config
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echo "CONFIG_BLK_DEV_DM_BUILTIN=y" >> ${KERNEL_DIR}/.config
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echo "CONFIG_DM_CRYPT=y" >> ${KERNEL_DIR}/.config
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echo "CONFIG_CRYPTO_BLKCIPHER=y" >> ${KERNEL_DIR}/.config
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echo "CONFIG_CRYPTO_CBC=y" >> ${KERNEL_DIR}/.config
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echo "CONFIG_CRYPTO_XTS=y" >> ${KERNEL_DIR}/.config
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echo "CONFIG_CRYPTO_SHA512=y" >> ${KERNEL_DIR}/.config
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echo "CONFIG_CRYPTO_MANAGER=y" >> ${KERNEL_DIR}/.config
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fi
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fi
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# Copy custom kernel configuration file
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if [ ! -z "$KERNELSRC_USRCONFIG" ] ; then
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cp $KERNELSRC_USRCONFIG ${KERNEL_DIR}/.config
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fi
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# Set kernel configuration parameters to their default values
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if [ "$KERNEL_OLDDEFCONFIG" = true ] ; then
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make -C "${KERNEL_DIR}" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" olddefconfig
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fi
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# Start menu-driven kernel configuration (interactive)
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if [ "$KERNEL_MENUCONFIG" = true ] ; then
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make -C "${KERNEL_DIR}" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" menuconfig
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fi
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fi
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# Use ccache to cross compile the kernel
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if [ "$KERNEL_CCACHE" = true ] ; then
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cc="ccache ${CROSS_COMPILE}gcc"
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else
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cc="${CROSS_COMPILE}gcc"
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fi
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# Cross compile kernel and dtbs
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make -C "${KERNEL_DIR}" -j${KERNEL_THREADS} ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" CC="${cc}" "${KERNEL_BIN_IMAGE}" dtbs
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# Cross compile kernel modules
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if [ $(grep "CONFIG_MODULES=y" "${KERNEL_DIR}/.config") ] ; then
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make -C "${KERNEL_DIR}" -j${KERNEL_THREADS} ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" CC="${cc}" modules
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fi
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fi
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# Check if kernel compilation was successful
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if [ ! -r "${KERNEL_DIR}/arch/${KERNEL_ARCH}/boot/${KERNEL_BIN_IMAGE}" ] ; then
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echo "error: kernel compilation failed! (kernel image not found)"
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cleanup
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exit 1
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fi
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# Install kernel modules
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if [ "$ENABLE_REDUCE" = true ] ; then
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if [ $(grep "CONFIG_MODULES=y" "${KERNEL_DIR}/.config") ] ; then
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make -C "${KERNEL_DIR}" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" INSTALL_MOD_STRIP=1 INSTALL_MOD_PATH=../../.. modules_install
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fi
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else
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if [ $(grep "CONFIG_MODULES=y" "${KERNEL_DIR}/.config") ] ; then
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make -C "${KERNEL_DIR}" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" INSTALL_MOD_PATH=../../.. modules_install
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fi
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# Install kernel firmware
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if [ $(grep "^firmware_install:" "${KERNEL_DIR}/Makefile") ] ; then
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make -C "${KERNEL_DIR}" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" INSTALL_FW_PATH=../../../lib firmware_install
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fi
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fi
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# Install kernel headers
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if [ "$KERNEL_HEADERS" = true ] && [ "$KERNEL_REDUCE" = false ] ; then
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make -C "${KERNEL_DIR}" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" INSTALL_HDR_PATH=../.. headers_install
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fi
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# Prepare boot (firmware) directory
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mkdir "${BOOT_DIR}"
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# Get kernel release version
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KERNEL_VERSION=`cat "${KERNEL_DIR}/include/config/kernel.release"`
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# Copy kernel configuration file to the boot directory
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install_readonly "${KERNEL_DIR}/.config" "${R}/boot/config-${KERNEL_VERSION}"
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# Prepare device tree directory
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mkdir "${BOOT_DIR}/overlays"
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# Ensure the proper .dtb is located
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if [ "$KERNEL_ARCH" = "arm" ] ; then
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for dtb in "${KERNEL_DIR}/arch/${KERNEL_ARCH}/boot/dts/"*.dtb ; do
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if [ -f "${dtb}" ] ; then
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install_readonly "${dtb}" "${BOOT_DIR}/"
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fi
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done
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else
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for dtb in "${KERNEL_DIR}/arch/${KERNEL_ARCH}/boot/dts/broadcom/"*.dtb ; do
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if [ -f "${dtb}" ] ; then
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install_readonly "${dtb}" "${BOOT_DIR}/"
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fi
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done
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fi
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# Copy compiled dtb device tree files
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if [ -d "${KERNEL_DIR}/arch/${KERNEL_ARCH}/boot/dts/overlays" ] ; then
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for dtb in "${KERNEL_DIR}/arch/${KERNEL_ARCH}/boot/dts/overlays/"*.dtb ; do
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if [ -f "${dtb}" ] ; then
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install_readonly "${dtb}" "${BOOT_DIR}/overlays/"
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fi
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done
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if [ -f "${KERNEL_DIR}/arch/${KERNEL_ARCH}/boot/dts/overlays/README" ] ; then
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install_readonly "${KERNEL_DIR}/arch/${KERNEL_ARCH}/boot/dts/overlays/README" "${BOOT_DIR}/overlays/README"
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fi
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fi
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if [ "$ENABLE_UBOOT" = false ] ; then
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# Convert and copy kernel image to the boot directory
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"${KERNEL_DIR}/scripts/mkknlimg" "${KERNEL_DIR}/arch/${KERNEL_ARCH}/boot/${KERNEL_BIN_IMAGE}" "${BOOT_DIR}/${KERNEL_IMAGE}"
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else
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# Copy kernel image to the boot directory
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install_readonly "${KERNEL_DIR}/arch/${KERNEL_ARCH}/boot/${KERNEL_BIN_IMAGE}" "${BOOT_DIR}/${KERNEL_IMAGE}"
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fi
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# Remove kernel sources
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if [ "$KERNEL_REMOVESRC" = true ] ; then
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rm -fr "${KERNEL_DIR}"
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else
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# Prepare compiled kernel modules
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if [ $(grep "CONFIG_MODULES=y" "${KERNEL_DIR}/.config") ] ; then
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if [ $(grep "^modules_prepare:" "${KERNEL_DIR}/Makefile") ] ; then
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make -C "${KERNEL_DIR}" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" modules_prepare
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fi
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# Create symlinks for kernel modules
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chroot_exec ln -sf /usr/src/linux "/lib/modules/${KERNEL_VERSION}/build"
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chroot_exec ln -sf /usr/src/linux "/lib/modules/${KERNEL_VERSION}/source"
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fi
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fi
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else # BUILD_KERNEL=false
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# Kernel installation
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chroot_exec apt-get -qq -y --no-install-recommends install linux-image-"${COLLABORA_KERNEL}" raspberrypi-bootloader-nokernel
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# Install flash-kernel last so it doesn't try (and fail) to detect the platform in the chroot
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chroot_exec apt-get -qq -y install flash-kernel
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# Check if kernel installation was successful
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VMLINUZ="$(ls -1 ${R}/boot/vmlinuz-* | sort | tail -n 1)"
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if [ -z "$VMLINUZ" ] ; then
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echo "error: kernel installation failed! (/boot/vmlinuz-* not found)"
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cleanup
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exit 1
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fi
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# Copy vmlinuz kernel to the boot directory
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install_readonly "${VMLINUZ}" "${BOOT_DIR}/${KERNEL_IMAGE}"
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fi
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