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1. How to Build
    - get Toolchain
        From android git server , codesourcery and etc ..
         - aarch64-linux-android-4.9

    - make output folder
        EX)OUTPUT_DIR=out
        $ mkdir out

    - edit Makefile
        edit "CROSS_COMPILE" to right toolchain path(You downloaded).
          EX)  CROSS_COMPILE= $(android platform directory you download)/android/prebuilt/linux-x86/aarch64/aarch64-linux-android-4.9/bin/aarch64-linux-android-
          Ex)  CROSS_COMPILE=/usr/local/toolchain/aarch64-linux-android-4.9/bin/aarch64-linux-android-          // check the location of toolchain

        $ export ARCH=arm64
        $ make -C $(pwd) O=out msm8976_sec_defconfig VARIANT_DEFCONFIG=msm8976_sec_a9xlte_chn_defconfig SELINUX_DEFCONFIG=selinux_defconfig SELINUX_LOG_DEFCONFIG=selinux_log_defconfig TIMA_DEFCONFIG=tima8976_defconfig
        $ make -C $(pwd) O=out

2. Output files
    - Kernel : out/arch/arm64/boot/Image
    - module : out/drivers/*/*.ko

3. How to Clean    
        Change to OUTPUT_DIR folder
        EX) $(pwd)/out
        $ make clean

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