1. Android build
  - Download original android source code ( android-9.0.0_r1 ) from http://source.android.com
  ( $repo init -u https://android.googlesource.com/platform/manifest -b android-9.0.0_r1
    $repo sync -cdq -j12 --no-tags
    $repo start android-8.1.0_r19 --all
  )
  - Untar opensource packages of LMQ910UM2_Android_Pie.tar.gz into downloaded android source directory
       a) tar -xvzf LMQ910UM2_Android_Pie.tar.gz
	   
  - And, merge the source into the android source code
  - Run following scripts to build android
    a) source build/envsetup.sh
    b) lunch 1
    c) make -j4
	
  - When you compile the android source code, you have to add google original prebuilt source(toolchain) into the android directory.
  - After build, you can find output at out/target/product/generic

2. Kernel Build  
  - Uncompress using following command at the android directory

    a) tar -xvzf LMQ910UM2_Kernel_Pie.tar.gz

  - When you compile the kernel source code, you have to add google original "prebuilt" source(toolchain) into the android directory.
  - Run following scripts to build kernel
  
   a) cd kernel/msm-4.4
   b) mkdir -p out
   c) export CROSS_COMPILE=../../../prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/bin/aarch64-linux-android-
   d) make ARCH=arm64 O=./out phoenix_lao_com-perf_defconfig
   e) make ARCH=arm64 O=./out KERNEL_COMPRESSION_SUFFIX=gz -j4

	* "-j4" : The number, 4, is the number of multiple jobs to be invoked simultaneously. 
  - After build, you can find the build image(zImage) at out/arch/arm/boot



