1 files changed, 97 insertions, 0 deletions
diff --git a/bootstrap.d/13-kernel.sh b/bootstrap.d/13-kernel.sh
new file mode 100644
index 0000000..633d993
--- /dev/null
+++ b/bootstrap.d/13-kernel.sh
@@ -0,0 +1,97 @@
+#
+# Kernel installation
+#
+
+. ./functions.sh
+
+# Fetch and build latest raspberry kernel
+if [ "$BUILD_KERNEL" = true ] ; then
+  # Fetch current raspberrypi kernel sources
+  git -C $R/tmp clone --depth=1 https://github.com/raspberrypi/linux
+
+  # Load default raspberry kernel configuration
+  make -C $R/tmp/linux ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- bcm2709_defconfig
+
+  # Cross compile kernel and modules
+  make -C $R/tmp/linux -j 8 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- zImage modules dtbs
+
+  # Install kernel modules
+  make -C $R/tmp/linux ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- INSTALL_MOD_PATH=../.. modules_install
+
+  # Copy and rename compiled kernel to boot directory
+  mkdir $R/boot/firmware/
+  $R/tmp/linux/scripts/mkknlimg $R/tmp/linux/arch/arm/boot/zImage $R/boot/firmware/kernel7.img
+
+  # Copy dts and dtb device definitions
+  mkdir $R/boot/firmware/overlays/
+  cp $R/tmp/linux/arch/arm/boot/dts/*.dtb $R/boot/firmware/
+  cp $R/tmp/linux/arch/arm/boot/dts/overlays/*.dtb* $R/boot/firmware/overlays/
+  cp $R/tmp/linux/arch/arm/boot/dts/overlays/README $R/boot/firmware/overlays/
+
+  # Install raspberry bootloader and flash-kernel
+  chroot_exec apt-get -qq -y --no-install-recommends install raspberrypi-bootloader-nokernel
+else
+  # Kernel installation
+  chroot_exec apt-get -qq -y --no-install-recommends install linux-image-${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 $R/boot/firmware/kernel7.img
+fi
+
+# Set up firmware boot cmdline
+CMDLINE="dwc_otg.lpm_enable=0 root=/dev/mmcblk0p2 rootfstype=ext4 rootflags=commit=100,data=writeback elevator=deadline rootwait net.ifnames=1 console=tty1"
+
+# Set up serial console support (if requested)
+if [ "$ENABLE_CONSOLE" = true ] ; then
+  CMDLINE="${CMDLINE} console=ttyAMA0,115200 kgdboc=ttyAMA0,115200"
+fi
+
+# Set up IPv6 networking support
+if [ "$ENABLE_IPV6" = false ] ; then
+  CMDLINE="${CMDLINE} ipv6.disable=1"
+fi
+
+echo "${CMDLINE}" >$R/boot/firmware/cmdline.txt
+
+# Set up firmware config
+install -o root -g root -m 644 files/config.txt $R/boot/firmware/config.txt
+
+# Load snd_bcm2835 kernel module at boot time
+if [ "$ENABLE_SOUND" = true ] ; then
+  echo "snd_bcm2835" >>$R/etc/modules
+fi
+
+# Set smallest possible GPU memory allocation size: 16MB (no X)
+if [ "$ENABLE_MINGPU" = true ] ; then
+  echo "gpu_mem=16" >>$R/boot/firmware/config.txt
+fi
+
+# Create symlinks
+ln -sf firmware/config.txt $R/boot/config.txt
+ln -sf firmware/cmdline.txt $R/boot/cmdline.txt
+
+# Prepare modules-load.d directory
+mkdir -p $R/lib/modules-load.d/
+
+# Load random module on boot
+if [ "$ENABLE_HWRANDOM" = true ] ; then
+  cat <<EOM >$R/lib/modules-load.d/rpi2.conf
+bcm2708_rng
+EOM
+fi
+
+# Prepare modprobe.d directory
+mkdir -p $R/etc/modprobe.d/
+
+# Blacklist sound modules
+install -o root -g root -m 644 files/modprobe.d/raspi-blacklist.conf $R/etc/modprobe.d/raspi-blacklist.conf
+
+# Create default fstab
+install -o root -g root -m 644 files/fstab $R/etc/fstab
+
+# Avoid swapping and increase cache sizes
+install -o root -g root -m 644 files/sysctl.d/81-rpi-vm.conf $R/etc/sysctl.d/81-rpi-vm.conf