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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"
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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
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cp -r "${KERNELSRC_DIR}" "${R}/usr/src"
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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="${CROSS_COMPILE}" mrproper
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fi
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else # KERNELSRC_DIR=""
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# Fetch current raspberrypi kernel sources
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git -C "${R}/usr/src" clone --depth=1 "${KERNEL_URL}"
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fi
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# Calculate optimal number of kernel building threads
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if [ "$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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if [ ! -z "$KERNELSRC_USRCONFIG" ] ; then
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cp $KERNELSRC_USRCONFIG ${KERNEL_DIR}/.config
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fi
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# Start menu-driven kernel configuration (interactive)
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if [ "$KERNEL_MENUCONFIG" = true ] ; then
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make -C "${KERNEL_DIR}" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" menuconfig
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fi
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fi
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# Cross compile kernel and modules
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make -C "${KERNEL_DIR}" -j${KERNEL_THREADS} ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" zImage modules dtbs
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fi
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# Check if kernel compilation was successful
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if [ ! -r "${KERNEL_DIR}/arch/${KERNEL_ARCH}/boot/zImage" ] ; then
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echo "error: kernel compilation failed! (zImage not found)"
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cleanup
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exit 1
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fi
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# Install kernel modules
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if [ "$ENABLE_REDUCE" = true ] ; then
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make -C "${KERNEL_DIR}" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" INSTALL_MOD_STRIP=1 INSTALL_MOD_PATH=../../.. modules_install
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else
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make -C "${KERNEL_DIR}" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" INSTALL_MOD_PATH=../../.. modules_install
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# Install kernel firmware
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make -C "${KERNEL_DIR}" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" INSTALL_FW_PATH=../../../lib firmware_install
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fi
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# Install kernel headers
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if [ "$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-${KERNEL_VERSION}"
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# Copy dts and dtb device tree sources and binaries
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mkdir "${BOOT_DIR}/overlays"
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install_readonly "${KERNEL_DIR}/arch/${KERNEL_ARCH}/boot/dts/"*.dtb "${BOOT_DIR}/"
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install_readonly "${KERNEL_DIR}/arch/${KERNEL_ARCH}/boot/dts/overlays/"*.dtb* "${BOOT_DIR}/overlays/"
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install_readonly "${KERNEL_DIR}/arch/${KERNEL_ARCH}/boot/dts/overlays/README" "${BOOT_DIR}/overlays/README"
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if [ "$ENABLE_UBOOT" = false ] ; then
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# Convert and copy zImage kernel to the boot directory
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"${KERNEL_DIR}/scripts/mkknlimg" "${KERNEL_DIR}/arch/${KERNEL_ARCH}/boot/zImage" "${BOOT_DIR}/${KERNEL_IMAGE}"
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else
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# Copy zImage kernel to the boot directory
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install_readonly "${KERNEL_DIR}/arch/${KERNEL_ARCH}/boot/zImage" "${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 "${KERNEL_DIR}"
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else
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make -C "${KERNEL_DIR}" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" modules_prepare
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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}/${KERNEL_IMAGE}"
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fi
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# Create symlinks for kernel modules
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ln -sf "${KERNEL_DIR}" "${R}/lib/modules/${KERNEL_VERSION}/build"
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ln -sf "${KERNEL_DIR}" "${R}/lib/modules/${KERNEL_VERSION}/source"
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# Install and setup fstab
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install_readonly files/mount/fstab "${ETC_DIR}/fstab"
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# Add usb/sda disk root partition to fstab
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if [ "$ENABLE_SPLITFS" = true ] && [ "$ENABLE_CRYPTFS" = false ] ; then
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sed -i "s/mmcblk0p2/sda1/" "${ETC_DIR}/fstab"
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fi
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# Add encrypted root partition to fstab and crypttab
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if [ "$ENABLE_CRYPTFS" = true ] ; then
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# Replace fstab root partition with encrypted partition mapping
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sed -i "s/mmcblk0p2/mapper\/${CRYPTFS_MAPPING}/" "${ETC_DIR}/fstab"
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# Add encrypted partition to crypttab and fstab
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install_readonly files/mount/crypttab "${ETC_DIR}/crypttab"
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echo "${CRYPTFS_MAPPING} /dev/mmcblk0p2 none luks" >> "${ETC_DIR}/crypttab"
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if [ "$ENABLE_SPLITFS" = true ] ; then
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# Add usb/sda disk to crypttab
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sed -i "s/mmcblk0p2/sda1/" "${ETC_DIR}/crypttab"
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fi
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fi
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# Generate initramfs file
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if [ "$ENABLE_INITRAMFS" = true ] ; then
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if [ "$ENABLE_CRYPTFS" = true ] ; then
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# Include initramfs scripts to auto expand encrypted root partition
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if [ "$EXPANDROOT" = true ] ; then
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install_exec files/initramfs/expand_encrypted_rootfs "${ETC_DIR}/initramfs-tools/scripts/init-premount/expand_encrypted_rootfs"
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install_exec files/initramfs/expand-premount "${ETC_DIR}/initramfs-tools/scripts/local-premount/expand-premount"
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install_exec files/initramfs/expand-tools "${ETC_DIR}/initramfs-tools/hooks/expand-tools"
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fi
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# Disable SSHD inside initramfs
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printf "#\n# DROPBEAR: [ y | n ]\n#\n\nDROPBEAR=n\n" >> "${ETC_DIR}/initramfs-tools/initramfs.conf"
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# Dummy mapping required by mkinitramfs
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echo "0 1 crypt $(echo ${CRYPTFS_CIPHER} | cut -d ':' -f 1) ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff 0 7:0 4096" | chroot_exec dmsetup create "${CRYPTFS_MAPPING}"
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# Generate initramfs with encrypted root partition support
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chroot_exec mkinitramfs -o "/boot/firmware/initramfs-${KERNEL_VERSION}" "${KERNEL_VERSION}"
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# Remove dummy mapping
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chroot_exec cryptsetup close "${CRYPTFS_MAPPING}"
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else
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# Generate initramfs without encrypted root partition support
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chroot_exec mkinitramfs -o "/boot/firmware/initramfs-${KERNEL_VERSION}" "${KERNEL_VERSION}"
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fi
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fi
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