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#
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# Build and Setup RPi2 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 "$R/usr/src/linux" ARCH="${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 https://github.com/raspberrypi/linux
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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 "$R/usr/src/linux" ARCH="${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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"$R/usr/src/linux/.config"
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fi
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if [ "$KERNELSRC_CONFIG" = true ] ; then
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# Load default raspberry kernel configuration
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make -C "$R/usr/src/linux" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" "${KERNEL_DEFCONFIG}"
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# Start menu-driven kernel configuration (interactive)
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if [ "$KERNEL_MENUCONFIG" = true ] ; then
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make -C "$R/usr/src/linux" 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 "$R/usr/src/linux" -j${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 "$R/usr/src/linux/arch/${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 [ "$ENABLE_REDUCE" = true ] ; then
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make -C "$R/usr/src/linux" 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 "$R/usr/src/linux" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" INSTALL_MOD_PATH=../../.. modules_install
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# Install kernel firmware
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make -C "$R/usr/src/linux" 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 "$R/usr/src/linux" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" INSTALL_HDR_PATH=../.. headers_install
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fi
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# Prepare boot (firmware) directory
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mkdir "$R/boot/firmware/"
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# Get kernel release version
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KERNEL_VERSION=`cat "$R/usr/src/linux/include/config/kernel.release"`
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# Copy kernel configuration file to the boot directory
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install_readonly "$R/usr/src/linux/.config" "$R/boot/config-${KERNEL_VERSION}"
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# Copy dts and dtb device tree sources and binaries
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mkdir "$R/boot/firmware/overlays/"
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install_readonly "$R/usr/src/linux/arch/${KERNEL_ARCH}/boot/dts/"*.dtb "$R/boot/firmware/"
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install_readonly "$R/usr/src/linux/arch/${KERNEL_ARCH}/boot/dts/overlays/"*.dtb* "$R/boot/firmware/overlays/"
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install_readonly "$R/usr/src/linux/arch/${KERNEL_ARCH}/boot/dts/overlays/README" "$R/boot/firmware/overlays/README"
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# Copy zImage kernel to the boot directory
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install_readonly "$R/usr/src/linux/arch/${KERNEL_ARCH}/boot/zImage" "$R/boot/firmware/kernel7.img"
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# Remove kernel sources
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if [ "$KERNEL_REMOVESRC" = true ] ; then
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rm -fr "$R/usr/src/linux"
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fi
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# Install latest boot binaries from raspberry/firmware github
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wget -q -O "$R/boot/firmware/bootcode.bin" https://github.com/raspberrypi/firmware/raw/master/boot/bootcode.bin
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wget -q -O "$R/boot/firmware/fixup_cd.dat" https://github.com/raspberrypi/firmware/raw/master/boot/fixup_cd.dat
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wget -q -O "$R/boot/firmware/fixup.dat" https://github.com/raspberrypi/firmware/raw/master/boot/fixup.dat
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wget -q -O "$R/boot/firmware/fixup_x.dat" https://github.com/raspberrypi/firmware/raw/master/boot/fixup_x.dat
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wget -q -O "$R/boot/firmware/start_cd.elf" https://github.com/raspberrypi/firmware/raw/master/boot/start_cd.elf
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wget -q -O "$R/boot/firmware/start.elf" https://github.com/raspberrypi/firmware/raw/master/boot/start.elf
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wget -q -O "$R/boot/firmware/start_x.elf" https://github.com/raspberrypi/firmware/raw/master/boot/start_x.elf
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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 "$VMLINUZ" "$R/boot/firmware/kernel7.img"
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fi
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# Setup firmware boot cmdline
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if [ "$ENABLE_SPLITFS" = true ] ; then
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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}"
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else
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CMDLINE="dwc_otg.lpm_enable=0 root=/dev/mmcblk0p2 rootfstype=ext4 rootflags=commit=100,data=writeback elevator=deadline rootwait net.ifnames=1 console=tty1 ${CMDLINE}"
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fi
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# Add serial console support
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if [ "$ENABLE_CONSOLE" = true ] ; then
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CMDLINE="${CMDLINE} console=ttyAMA0,115200 kgdboc=ttyAMA0,115200"
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fi
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# Remove IPv6 networking support
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if [ "$ENABLE_IPV6" = false ] ; then
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CMDLINE="${CMDLINE} ipv6.disable=1"
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fi
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# Install firmware boot cmdline
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echo "${CMDLINE}" > "$R/boot/firmware/cmdline.txt"
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# Add encrypted root partition to cmdline.txt
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if [ "$ENABLE_CRYPTFS" = true ] ; then
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sed -i "s/mmcblk0p2/mapper\/${CRYPTFS_MAPPING} cryptdevice=\/dev\/mmcblk0p2:${CRYPTFS_MAPPING}/" "$R/boot/firmware/cmdline.txt"
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fi
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# Install firmware config
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install_readonly files/boot/config.txt "$R/boot/firmware/config.txt"
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# Setup minimal GPU memory allocation size: 16MB (no X)
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if [ "$ENABLE_MINGPU" = true ] ; then
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echo "gpu_mem=16" >> "$R/boot/firmware/config.txt"
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fi
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# Setup boot with initramfs
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if [ "$ENABLE_INITRAMFS" = true ] ; then
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echo "initramfs initramfs-${KERNEL_VERSION} followkernel" >> "$R/boot/firmware/config.txt"
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fi
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# Create firmware configuration and cmdline symlinks
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ln -sf firmware/config.txt "$R/boot/config.txt"
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ln -sf firmware/cmdline.txt "$R/boot/cmdline.txt"
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# Install and setup kernel modules to load at boot
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mkdir -p "$R/lib/modules-load.d/"
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install_readonly files/modules/rpi2.conf "$R/lib/modules-load.d/rpi2.conf"
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# Load hardware random module at boot
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if [ "$ENABLE_HWRANDOM" = true ] ; then
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sed -i "s/^# bcm2708_rng/bcm2708_rng/" "$R/lib/modules-load.d/rpi2.conf"
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fi
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# Load sound module at boot
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if [ "$ENABLE_SOUND" = true ] ; then
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sed -i "s/^# snd_bcm2835/snd_bcm2835/" "$R/lib/modules-load.d/rpi2.conf"
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fi
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# Install kernel modules blacklist
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mkdir -p "$R/etc/modprobe.d/"
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install_readonly files/modules/raspi-blacklist.conf "$R/etc/modprobe.d/raspi-blacklist.conf"
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# Install and setup fstab
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install_readonly files/mount/fstab "$R/etc/fstab"
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# Add usb/sda disk root partition to fstab
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if [ "$ENABLE_SPLITFS" = true ] ; then
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sed -i "s/mmcblk0p2/sda1/" "$R/etc/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}/" "$R/etc/fstab"
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# Add encrypted partition to crypttab and fstab
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install_readonly files/mount/crypttab "$R/etc/crypttab"
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echo "${CRYPTFS_MAPPING} /dev/mmcblk0p2 none luks" >> "$R/etc/crypttab"
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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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# 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}" "${KERNEL_VERSION}"
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fi
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fi
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# Install sysctl.d configuration files
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install_readonly files/sysctl.d/81-rpi-vm.conf "$R/etc/sysctl.d/81-rpi-vm.conf"
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