source build/envsetup.sh
lunch sabresd_6dq-user
make -j20

============================================
PLATFORM_VERSION_CODENAME=REL    //平台
PLATFORM_VERSION=6.0.1
TARGET_PRODUCT=sabresd_6dq       //目标信息，也就是开发板上的
TARGET_BUILD_VARIANT=user
TARGET_BUILD_TYPE=release
TARGET_BUILD_APPS=
TARGET_ARCH=arm
TARGET_ARCH_VARIANT=armv7-a-neon
TARGET_CPU_VARIANT=cortex-a9
TARGET_2ND_ARCH=
TARGET_2ND_ARCH_VARIANT=
TARGET_2ND_CPU_VARIANT=
HOST_ARCH=x86_64　　　　　　　　//主机信息，也就是当前编译系统的电脑
HOST_OS=linux
HOST_OS_EXTRA=Linux-3.16.0-30-generic-x86_64-with-Ubuntu-14.04-trusty
HOST_BUILD_TYPE=release
BUILD_ID=2.1.0-ga-rc2
OUT_DIR=out
============================================
including ./abi/cpp/Android.mk ...
including ./art/Android.mk ...
including ./bionic/Android.mk ...
including ./bootable/recovery/Android.mk ...
including ./build/libs/host/Android.mk ...
including ./build/target/board/Android.mk ...
including ./build/target/product/security/Android.mk ...
including ./build/tools/Android.mk ...
。。。
including ./tools/external/fat32lib/Android.mk ...
No private recovery resources for TARGET_DEVICE sabresd_6dq//编译内核的信息，这里可以看出ARCH,CROSS_COMPILE，最后生成的为uImage
make -C kernel_imx -j20 uImage ARCH=arm CROSS_COMPILE=`pwd`/prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.9/bin/arm-linux-androideabi- LOADADDR=0x10008000 KCFLAGS=-mno-android
for ubootplat in imx6q:mx6qsabresdandroid_config imx6dl:mx6dlsabresdandroid_config imx6q-ldo:mx6qsabresdandroid_config imx6qp:mx6qpsabresdandroid_config; do \UBOOT_PLATFORM=`echo $ubootplat | cut -d':' -f1`; \UBOOT_CONFIG=`echo $ubootplat | cut -d':' -f2`; \echo ; \echo ; \　　　　 //清除ubootmake -C bootable/bootloader/uboot-imx/ distclean ARCH=arm CROSS_COMPILE=`pwd`/prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.9/bin/arm-linux-androideabi-; \//配置uboot，就类似于kernel的make menuconfig　　　　 make -C bootable/bootloader/uboot-imx/ $UBOOT_CONFIG ARCH=arm CROSS_COMPILE=`pwd`/prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.9/bin/arm-linux-androideabi-; \//编译uboot　　　　 make -C bootable/bootloader/uboot-imx/ ARCH=arm CROSS_COMPILE=`pwd`/prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.9/bin/arm-linux-androideabi-; \install -D bootable/bootloader/uboot-imx/u-boot.imx out/target/product/sabresd_6dq/u-boot-$UBOOT_PLATFORM.imx; \install -D bootable/bootloader/uboot-imx/u-boot.imx out/target/product/sabresd_6dq/u-boot.imx; \donemake[1]: Entering directory `/home/hejin/myandroid/bootable/bootloader/uboot-imx'
Copy: out/target/product/sabresd_6dq/root/fstab.freescaleCLEAN   examples/standaloneCLEAN   toolsCLEAN   tools/lib tools/commonCLEAN   scripts/basicCLEAN   scripts/kconfigCLEAN   u-boot u-boot.bin u-boot.imx u-boot.lds u-boot.map u-boot.srec System.map
。。。HOSTCC  tools/mkimage.oHOSTCC  tools/proftoolHOSTCC  tools/lib/crc32.oHOSTCC  tools/common/bootm.o
Image Name:   Linux-4.1.15-g419e1f7-dirty
Created:      Tue Feb 13 11:05:45 2018
Image Type:   ARM Linux Kernel Image (uncompressed)
Data Size:    8715592 Bytes = 8511.32 kB = 8.31 MB
Load Address: 10008000
Entry Point:  10008000Image arch/arm/boot/uImage is ready
make[1]: Leaving directory `/home/hejin/myandroid/kernel_imx'
  HOSTCC  tools/lib/fdtdec_common.o//编译设备树，跟上面类似
make -C kernel_imx dtbs ARCH=arm CROSS_COMPILE=`pwd`/prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.9/bin/arm-linux-androideabi- LOADADDR=0x10008000 KCFLAGS=-mno-androidHOSTCC  tools/lib/fdtdec.oHOSTCC  tools/common/image-fit.oHOSTCC  tools/common/image.oHOSTCC  tools/lib/md5.oHOSTCC  tools/lib/sha1.o