普通步骤是：用来编译整个Android源码
source build/envsetup.shlunch sabresd_6dq-usermake -j20
不过每次这样太繁琐，下面来单独编译kernel分析：在上面make之后的日志中
No private recovery resources for TARGET_DEVICE sabresd_6dqmake -C kernel_imx imx_v7_android_defconfig ARCH=arm CROSS_COMPILE=`pwd`/prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.9/bin/arm-linux-androideabi- LOADADDR=0x10008000 KCFLAGS=-mno-android //编译生成zImagemake[1]: Entering directory `/home/hejin/myandroid/kernel_imx'## configuration written to .config#make[1]: Leaving directory `/home/hejin/myandroid/kernel_imx'install -D kernel_imx/.config out/target/product/sabresd_6dq/.configmake -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 //编译生成uImagemake[1]: Entering directory `/home/hejin/myandroid/kernel_imx'scripts/kconfig/conf --silentoldconfig Kconfigmake[1]: Leaving directory `/home/hejin/myandroid/kernel_imx'make[1]: Entering directory `/home/hejin/myandroid/kernel_imx' CHK include/config/kernel.release CHK include/generated/uapi/linux/version.h CC scripts/mod/empty.o CC scripts/mod/devicetable-offsets.s MKELF scripts/mod/elfconfig.h
编译：
1. 根据上面导出环境变量
export ARCH=arm
export CROSS_COMPILE=~/myandroid/prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.9/bin/arm-linux-androideabi-2. 编译 make savedefconfig //将当前的.config生成defconfigmake imx_v7_android_defconfig //重新生成.configecho $CROSS_COMPILE //make all -j20 >> ~/debug.txt //生成zImage make -j20 uImage LOADADDR=0x10008000 KCFLAGS=-mno-android //生成uImage，暂时不清楚为何
接着编译bootimg (uImagel 和ramdisk)：
source build/envsetup.sh lunch sabresd_6dq-user make bootimage