android内核剖析6.0,Android6.0内核移植（1）：分析编译日志
============================================PLATFORM_VERSION_CODENAME=REL //平台
PLATFORM_VERSION=6.0.1TARGET_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 ...
Noprivate recovery resources forTARGET_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-androidfor 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uboot
make-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; \
done
make[1]: Entering directory `/home/hejin/myandroid/bootable/bootloader/uboot-imx'Copy: out/target/product/sabresd_6dq/root/fstab.freescale
CLEAN examples/standalone
CLEAN tools
CLEAN tools/lib tools/common
CLEAN scripts/basic
CLEAN scripts/kconfig
CLEAN u-boot u-boot.bin u-boot.imx u-boot.lds u-boot.map u-boot.srec System.map
。。。
HOSTCC tools/mkimage.o
HOSTCC tools/proftool
HOSTCC tools/lib/crc32.o
HOSTCC tools/common/bootm.o
Image Name: Linux-4.1.15-g419e1f7-dirty
Created: Tue Feb13 11:05:45 2018Image Type: ARM Linux Kernel Image (uncompressed)
Data Size:8715592 Bytes = 8511.32 kB = 8.31MB
Load Address:10008000Entry Point:10008000Image arch/arm/boot/uImage isready
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-android
HOSTCC tools/lib/fdtdec.o
HOSTCC tools/common/image-fit.o
HOSTCC tools/common/image.o
HOSTCC tools/lib/md5.o
HOSTCC tools/lib/sha1.o