如何下载Android kernel内核源代码,编译烧写验证

1. Download Kernel source
   Study:       
   1. Please refer to the AOSP official kernel download address:
    http://source.android.com/source/building-kernels.html
   2. goto https://android.googlesource.com/kernel/msm.git check which branch your will get,
    for Secure Phone please checkout android-msm-hammerhead-3.4-kitkat-mr1 version
    
   commands:
    $ git clone https://android.googlesource.com/kernel/msm.git hammerhead-kernel
    $ cd hammerhead-kernel
    $ git checkout android-msm-hammerhead-3.4-kitkat-mr1
          
2. Build Kernel
    $ cd $(AOSP_PATH)
    $ . build/envsetup.sh
    $ lunch 12
       $ export ARCH=arm
    $ export SUBARCH=arm
    $ export CROSS_COMPILE=arm-eabi-
    $ cd hammerhead-kernel
    $ make hammerhead_defconfig
    $ make

3. Verify Kernel

   cp $(KERNEL)arch/arm/boot/zImag-dtb (ANDROID_ROOT)out/target/product/hammerhead/kernel

     out/host/linux-x86/bin/mkbootimg  --kernel out/target/product/hammerhead/kernel --ramdisk out/target/product/hammerhead/ramdisk.img --cmdline "console=ttyHSL0,115200,n8 androidboot.hardware=hammerhead user_debug=31 maxcpus=2 msm_watchdog_v2.enable=1" --base 0x00000000 --pagesize 2048 --ramdisk_offset 0x02900000 --tags_offset 0x02700000 --output out/target/product/hammerhead/boot.img

adb shell su 0 reboot bootloader

fastboot flash boot out/target/product/hammerhead/boot.img

fastboot reboot