coachz-update-kernel.sh

#!/bin/sh

export ARCH=arm64

if [ $(whoami) != root ]; then

  echo "You should probably be running me as root!"

  export RUN_AS_ROOT=sudo

  echo "You now are:" $(${RUN_AS_ROOT} whoami)

  echo

fi

## Cleanup if set

if [ ! -z ${CLEAN_BUILD} ]; then

  rm -f Image Image.lz4 bootloader.bin kernel.itb vmlinux.kpart
  make clean
  make mrproper
  
  cd tools/perf
  make clean
  cd ../power/cpupower
  make clean
  cd ../../..

fi

## Update the .config

if [ ! -e .config ]; then

  echo ".config not present... exiting."
  exit 0

fi

if [ ! -e cmdline ]; then

  echo "cmdline not present... exiting."
  exit 0

fi

make olddefconfig

## Set our device tree blobs

DT_BLOBS="-b arch/arm64/boot/dts/qcom/sc7180-trogdor-coachz-r1-lte.dtb -b arch/arm64/boot/dts/qcom/sc7180-trogdor-coachz-r1.dtb -b arch/arm64/boot/dts/qcom/sc7180-trogdor-coachz-r3.dtb -b arch/arm64/boot/dts/qcom/sc7180-trogdor-coachz-r3-lte.dtb -b arch/arm64/boot/dts/qcom/sc7180-trogdor-r1.dtb -b arch/arm64/boot/dts/qcom/sc7180-trogdor-r1-lte.dtb"

## Build Image dtbs and modules

make -j 8 Image dtbs modules

## Build misc components

cd tools/perf
make -j 8
cd ../power/cpupower
make -j 8
cd ../../..

## Get the kernel version

export kver=`make kernelrelease`
echo ${kver}

## Install kernel modules and components to disk

${RUN_AS_ROOT} make modules_install
${RUN_AS_ROOT} mkdir -p /lib/modules/${kver}/tools
${RUN_AS_ROOT} cp -v tools/perf/perf /lib/modules/${kver}/tools
${RUN_AS_ROOT} cp -v tools/power/cpupower/cpupower /lib/modules/${kver}/tools
${RUN_AS_ROOT} cp -v tools/power/cpupower/libcpupower.so.0.0.1 /lib/modules/${kver}/tools/libcpupower.so.0

## Update /boot components

${RUN_AS_ROOT} cp -v .config /boot/config-${kver}
${RUN_AS_ROOT} cp -v arch/arm64/boot/Image /boot/Image-${kver}
${RUN_AS_ROOT} mkdir -p /boot/dtb-${kver}
${RUN_AS_ROOT} cp -v arch/arm64/boot/dts/qcom/sc7180-trogdor*.dtb /boot/dtb-${kver}
${RUN_AS_ROOT} cp -v System.map /boot/System.map-${kver}

## Build chromebook compatible image

cp arch/arm64/boot/Image Image
lz4 -f Image Image.lz4
dd if=/dev/zero of=bootloader.bin bs=512 count=1

mkimage -D "-I dts -O dtb -p 2048" -f auto -A arm64 -O linux -T kernel -C lz4 -a 0 -d Image.lz4 ${DT_BLOBS} kernel.itb kernel.itb

vbutil_kernel --pack vmlinux.kpart --keyblock /usr/share/vboot/devkeys/kernel.keyblock --signprivate /usr/share/vboot/devkeys/kernel_data_key.vbprivk --version 1 --config cmdline --bootloader bootloader.bin --vmlinuz kernel.itb --arch arm

${RUN_AS_ROOT} cp -v vmlinux.kpart /boot/vmlinux.kpart-${kver}

## Write vmlinux to kernel partition

${RUN_AS_ROOT} dd if=vmlinux.kpart of=/dev/mmcblk1p1

## Update initramfs

cd /boot

${RUN_AS_ROOT} update-initramfs -c -k ${kver}

cd -

exit 0