Android Kernel save defalut config

/*********************************************************************************
 *                    Android Kernel save defalut config
 * 说明：
 *     一个没注意设置环境变量，把默认的配置文件给操作没了。
 *
 *                                       2017-11-13 深圳 南山平山村 曾剑锋
 ********************************************************************************/

一、获取config文件名
    including ./system/netd/server/Android.mk ...
    including ./system/security/keystore-engine/Android.mk ...
    including ./system/security/keystore/Android.mk ...
    including ./system/security/softkeymaster/Android.mk ...
    including ./system/vold/Android.mk ...
    including ./tools/external/fat32lib/Android.mk ...
    No private recovery resources for TARGET_DEVICE sabresd_6dq
    make -C kernel_imx imx_v7_android_defconfig ARCH=arm CROSS_COMPILE=`pwd`/prebuilts/gcc/linux-x86/arm/arm-eabi-4.6/bin/arm-eabi- LOADADDR=0x10008000
    make[1]: Entering directory `/home/desk/myandroid/kernel_imx'
    #
    # configuration written to .config
    #
    make[1]: Leaving directory `/home/desk/myandroid/kernel_imx'
    install -D kernel_imx/.config out/target/product/sabresd_6dq/.config
    make -C kernel_imx -j20 uImage ARCH=arm CROSS_COMPILE=`pwd`/prebuilts/gcc/linux-x86/arm/arm-eabi-4.6/bin/arm-eabi- LOADADDR=0x10008000
    make[1]: Entering directory `/home/desk/myandroid/kernel_imx'
    scripts/kconfig/conf --silentoldconfig Kconfig
    make[1]: Leaving directory `/home/desk/myandroid/kernel_imx'
    make[1]: Entering directory `/home/desk/myandroid/kernel_imx'
      CHK     include/config/kernel.release
      CHK     include/generated/uapi/linux/version.h
    ^Cmake[1]: *** [include/config/kernel.release] Interrupt
    make: *** [out/target/product/sabresd_6dq/kernel] Interrupt

二、找出文件位置
    desk@desk-ubuntu:~/myandroid/kernel_imx$ find * -iname imx_v7_android_defconfig
    arch/arm/configs/imx_v7_android_defconfig

三、操作过程
    1. 设置ARM环境变量，否者会进入x86内核状态：
        export ARCH=arm
        export CROSS_COMPILE=~/myandroid/prebuilts/gcc/linux-x86/arm/arm-eabi-4.6/bin/arm-eabi-
    2. make menuconfig
    3. make savedefconfig 
    4. cp defconfig arch/arm/configs/imx_v7_android_defconfig