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#
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# Kernel installation
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#
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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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# Fetch current raspberrypi kernel sources
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git -C $R/usr/local/src clone --depth=1 https://github.com/raspberrypi/linux
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# Load default raspberry kernel configuration
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make -C $R/usr/local/src/linux ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- bcm2709_defconfig
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# Cross compile kernel and modules
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make -C $R/usr/local/src/linux -j$(grep -c processor /proc/cpuinfo) ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- zImage modules dtbs
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# Install kernel modules
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make -C $R/usr/local/src/linux ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- INSTALL_MOD_PATH=../.. modules_install
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# Install kernel headers
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if [ "$KERNEL_HEADERS" = true ]; then
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make -C $R/usr/local/src/linux ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- INSTALL_HDR_PATH=../../usr headers_install
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fi
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# Copy and rename compiled kernel to boot directory
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mkdir $R/boot/firmware/
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$R/usr/local/src/linux/scripts/mkknlimg $R/usr/local/src/linux/arch/arm/boot/zImage $R/boot/firmware/kernel7.img
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# Copy dts and dtb device definitions
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mkdir $R/boot/firmware/overlays/
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cp $R/usr/local/src/linux/arch/arm/boot/dts/*.dtb $R/boot/firmware/
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cp $R/usr/local/src/linux/arch/arm/boot/dts/overlays/*.dtb* $R/boot/firmware/overlays/
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cp $R/usr/local/src/linux/arch/arm/boot/dts/overlays/README $R/boot/firmware/overlays/
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# Install raspberry bootloader and flash-kernel
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chroot_exec apt-get -qq -y --no-install-recommends install raspberrypi-bootloader-nokernel
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else
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# Kernel installation
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chroot_exec apt-get -qq -y --no-install-recommends install linux-image-${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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VMLINUZ="$(ls -1 $R/boot/vmlinuz-* | sort | tail -n 1)"
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[ -z "$VMLINUZ" ] && exit 1
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cp $VMLINUZ $R/boot/firmware/kernel7.img
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fi
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# Set up firmware boot cmdline
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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 ${CMDLINE}"
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# Set up serial console support (if requested)
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if [ "$ENABLE_CONSOLE" = true ] ; then
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CMDLINE="${CMDLINE} console=ttyAMA0,115200 kgdboc=ttyAMA0,115200"
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fi
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# Set up IPv6 networking support
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if [ "$ENABLE_IPV6" = false ] ; then
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CMDLINE="${CMDLINE} ipv6.disable=1"
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fi
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echo "${CMDLINE}" >$R/boot/firmware/cmdline.txt
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# Set up firmware config
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install -o root -g root -m 644 files/config.txt $R/boot/firmware/config.txt
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# Load snd_bcm2835 kernel module at boot time
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if [ "$ENABLE_SOUND" = true ] ; then
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echo "snd_bcm2835" >>$R/etc/modules
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fi
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# Set smallest possible GPU memory allocation size: 16MB (no X)
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if [ "$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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# Create 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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# Prepare modules-load.d directory
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mkdir -p $R/lib/modules-load.d/
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# Load random module on boot
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if [ "$ENABLE_HWRANDOM" = true ] ; then
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cat <<EOM >$R/lib/modules-load.d/rpi2.conf
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bcm2708_rng
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EOM
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fi
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# Prepare modprobe.d directory
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mkdir -p $R/etc/modprobe.d/
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# Blacklist sound modules
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install -o root -g root -m 644 files/modprobe.d/raspi-blacklist.conf $R/etc/modprobe.d/raspi-blacklist.conf
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# Create default fstab
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install -o root -g root -m 644 files/fstab $R/etc/fstab
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# Avoid swapping and increase cache sizes
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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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