Build Linux 4.9-rc8 with Allwinner H3 EMAC

build.sh

#!/usr/bin/env bash
# build kernel 4.9-rc8 with sun8i-emac for Allwinner H3
# Copyright (C) 2016 Hal Martin

# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

KERNEL_VER="linux-4.9-rc8"
KERNEL_SRC="https://cdn.kernel.org/pub/linux/kernel/v4.x/testing/$KERNEL_VER.tar.xz"
KERNEL_SHA1="ce27213b1028074385eff54e0bb981fe93cb7303"
CONF="linux-4.9rc8_config"
CONF_GZ="$CONF".gz
CONF_SRC="https://watchmysys.com/blog/wp-content/uploads/2016/12/$CONF_GZ"
CONF_SHA1="87e7da01f889879e27bb890707f10825220d600c"
PATCH_GZ="patches.tar.gz"
PATCH_SRC="https://watchmysys.com/blog/wp-content/uploads/2016/12/$PATCH_GZ"
PATCH_DIR="patches"
PATCH_SHA1="9d085f7329b6b8fd35c534c5f3a8392124f46e16"
CPUS="$(cat /proc/cpuinfo | grep processor | wc -l)"

function fetch_kernel {
  if [ ! -f "$KERNEL_VER".tar.xz ]; then
    wget "$KERNEL_SRC"
    if [ $? -ne 0 ]; then
      echo "Error downloading kernel source"
      exit 1
    fi
  fi
  if [ "$(sha1sum "$KERNEL_VER".tar.xz | awk '{print $1}')" != "$KERNEL_SHA1" ]; then
    echo Kernel sha1sum does not match, please check the integrity of "$KERNEL_VER".tar.xz
    exit 1
  else
    echo "Kernel source already downloaded"
  fi

  if [ ! -f "$CONF_GZ" ]; then
    wget "$CONF_SRC"
    if [ $? -ne 0 ]; then
      echo "Error downloading kernel configuration"
      exit 1
    fi
  fi
  if [ "$(sha1sum $CONF_GZ | awk '{print $1}')" != "$CONF_SHA1" ]; then
    echo "Kernel config sha1sum does not match"
    exit 1
  else
    echo "Kernel config already downloaded"
  fi

  if [ ! -f "$PATCH_GZ" ]; then
    wget "$PATCH_SRC"
    if [ $? -ne 0 ]; then
      echo "Error downloading kernel patches"
      exit 1
    fi
  fi
  if [ "$(sha1sum $PATCH_GZ | awk '{print $1}')" != "$PATCH_SHA1" ]; then
    echo "Patch archive sha1sum does not match"
    exit 1
  else
    echo "Patches already downloaded"
  fi
}

function prepare_kernel {
  if [ -d "$KERNEL_VER" ]; then
    echo "Kernel source already extracted"
  else
    echo "Extracting kernel source to $(pwd)/$KERNEL_VER"
    tar -Jxf "$KERNEL_VER".tar.xz
  fi
  if [ ! -d "$PATCH_DIR" ]; then
    tar -zxf "$PATCH_GZ"
  else
    echo "Patches already extracted"
  fi
  gunzip -f -k "$CONF_GZ"
}

function patch_kernel {
  for i in {01..10}; do
    patch --forward -d "$KERNEL_VER" -p1 -i "$(pwd)"/"$PATCH_DIR"/"$i"_10.patch 
    if [ $? -ne 0 ]; then
      echo Failed to apply patch "$i"_10.patch
    fi
  done
}

function build_kernel {
  if [ ! -f "$KERNEL_VER"/.config ]; then
    cp "$CONF" "$KERNEL_VER"/.config
    pushd "$(pwd)"/"$KERNEL_VER"
    make ARCH=arm CROSS_COMPILE=arm-none-eabi- olddefconfig
    if [ $? -ne 0 ]; then
      echo "Error configuring kernel"
      exit 1
    fi
  else
    echo "Kernel already configured"
    pushd "$(pwd)"/"$KERNEL_VER"
  fi
  make ARCH=arm CROSS_COMPILE=arm-none-eabi- -j"$CPUS"
  if [ $? -ne 0 ]; then
    echo "Error building kernel"
    exit 1
  fi
  make ARCH=arm CROSS_COMPILE=arm-none-eabi- uImage LOADADDR=0x40008000
  if [ $? -ne 0 ]; then
    echo "Error building kernel uImage"
    exit 1
  fi
  popd
}

function install_kernel {
  TMPDIR=$(mktemp -d -p "$(pwd)")
  pushd "$(pwd)"/"$KERNEL_VER"
  make ARCH=arm CROSS_COMPILE=arm-none-eabi- INSTALL_MOD_PATH="$TMPDIR" modules_install
  cp arch/arm/boot/uImage "$TMPDIR"
  popd
  echo "====================================="
  echo "Kernel image and modules installed to: $TMPDIR"
  echo "====================================="
}

fetch_kernel
prepare_kernel
patch_kernel
build_kernel
install_kernel