rpi-kernel-copy

#!/bin/bash 
set -e   # fail on error

###
# #%L
# **********************************************************************
# PROJECT       :  rpi-scripts
# FILENAME      :  rpi-kernel-copy
# **********************************************************************
# 
# Copyright (C) 2015 Robert Savage
# 
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# 
#      http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# 
###

echo 
echo
echo "******************************************************"
echo "******************************************************"
echo "**                                                  **"
echo "**  THIS IS A CUSTOM BUILD SCRIPT FOR COPYING A     **"
echo "**  CUSTOM BUILD OF THE RASPBERRY PI LINUX KERNEL   **"
echo "**  TO AN EXISTING RASPIAN SDCARD or uSDCARD        **"
echo "**                                                  **"
echo "******************************************************"
echo "******************************************************"
echo 
echo " Please note that you must have the Raspberry Pi" 
echo " cross-compiler tool chain available on your local"
echo " build machine and also have the cross compiler"
echo " path in your environment variables.  It may look"
echo " something like the example below, however you will"
echo " need to modify to account for your filesystem location"
echo " and your local machine architecture x86/x64."
echo 
echo " > export PATH=\$PATH:\$HOME/rpi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin"
echo 
echo
echo
echo " In addition to the compiler tools, you will also need"
echo " the linux kernel that you with to build against."
echo " The path to kernel that you want to build against must"
echo " defined in the environment variable: KERNELDIR"
echo
echo " > export KERNELDIR=$HOME/dev/rpi/linux"
echo

# validate that a kernel director environment variable exists
if [ -z $KERNELDIR ]
  then
	echo "-------------------------------"
	echo " MISSING KERNELDIR ENV VAR"
	echo "-------------------------------"
	echo
	exit
fi

# navigate to the kernel directory to build from
cd $KERNELDIR

# determine compiler tools path for RPI/ARM
ARM_GCC=$(eval which arm-linux-gnueabihf-gcc)
CCPATH=$(dirname "${ARM_GCC}")

echo
echo "-------------------------------"
echo " KERNEL PATH"
echo "-------------------------------"
echo " BUILDING KERNEL IN   : $KERNELDIR"
echo " CROSS_COMPILER TOOLS : $CCPATH"

echo
echo "------------------------------"
echo " GCC COMPILER VERSION"
echo "------------------------------"
sudo $CCPATH/arm-linux-gnueabihf-gcc --version

echo
echo "------------------------------"
echo " RASPBERRY PI PLATFORM"
echo "------------------------------"
echo " (1) Raspberry Pi Models A, B, A+, B+, Compute Module"
echo " (2) Raspberry Pi Model 2B <DEFAULT>"
read -p "Which hardware platform do you wish to build the kernel for <1|2>? (2) " rpi_platform

case $rpi_platform in
  [1]* ) 
         echo "----------------------------------------"
         echo " COPY KERNEL FOR RASPBERRY PI A,B,A+,B+"
         echo "----------------------------------------"
         KERNEL=kernel         
         ;;
  * ) 
         echo "---------------------------------"
         echo " COPY KERNEL7 FOR RASPBERRY PI 2B"
         echo "---------------------------------"
         KERNEL=kernel7
         ;;
esac

echo
echo "------------------------------"
echo " SDCARD MOUNTS"
echo "------------------------------"
lsblk
echo
echo "Provide SDCARD mount path for the FAT32 boot partition :"
read -p " > " FAT32
if [ -z $FAT32 ]
  then exit
fi

echo
echo "Provide SDCARD mount path for the EXT4 data partition :"
read -p " > " EXT4
if [ -z $EXT4 ]
  then exit
fi

echo
echo "You selected:"
echo " [FAT32 BOOT] : $FAT32"
echo " [EXT4 DATA]  : $EXT4"
echo
read -p "Are these mount paths correct (!! DO NOT SCREW THIS UP !!) <y|n>? (y) " yn
case $yn in
  [nN]* ) exit;;
  *     ) ;;
esac

echo
echo "------------------------------"
echo " COPY MODULES TO SDCARD"
echo "------------------------------"
set -x
sudo -E make ARCH=arm CROSS_COMPILE=$CCPATH/arm-linux-gnueabihf- INSTALL_MOD_PATH=$EXT4 modules_install
set +x

echo
echo "------------------------------"
echo " BACKUP EXISTING KERNEL IMAGE"
echo "------------------------------"
set -x
sudo -E cp $FAT32/$KERNEL.img $FAT32/$KERNEL-backup.img
set +x

echo
echo "------------------------------"
echo " COPY NEW KERNEL IMAGE"
echo "------------------------------"
set -x
sudo -E scripts/mkknlimg arch/arm/boot/zImage $FAT32/$KERNEL.img
set +x

echo
echo "------------------------------"
echo " COPY DEVICE TREE & OVERLAYS"
echo "------------------------------"
set -x
sudo -E cp arch/arm/boot/dts/*.dtb $FAT32
sudo -E cp arch/arm/boot/dts/overlays/*.dtb* $FAT32/overlays/
sudo -E cp arch/arm/boot/dts/overlays/README $FAT32/overlays/
set +x

echo
echo "------------------------------"
echo " SYNCING DATA TO SDCARD"
echo "------------------------------"
echo " ... please wait ... "
sync

echo
echo "------------------------------"
echo " UN-MOUNTING SDCARD"
echo "------------------------------"
echo " ... please wait ... "
echo
sudo -E umount $FAT32
sudo -E umount $EXT4

echo
echo "------------------------------"
echo " KERNEL COPIED TO SDCARD"
echo "------------------------------"
echo " You may now remove your SDCARD and boot your Raspberry Pi!"
echo

exit 0