如何編譯 A688 手機的 Kernel

以下編譯環境為 Ubuntu 10.10 X64

1. 先安裝必要套件

$ sudo apt-get install git-core gnupg

 sun-java5-jdk flex bison gperf libsdl-dev

 libesd0-dev libwxgtk2.6-dev build-essential

 zip curl libncurses5-dev zlib1g-dev

2. 建立資料夾並下載相關 source code 及編譯工具

$ mkdir ~/A688

$ cd A688

$ git clone git://android.git.kernel.org/platform/frameworks/base.git
$ git clone git://android.git.kernel.org/platform/hardware/libhardware.git
$ git clone git://android.git.kernel.org/platform/hardware/libhardware_legacy.git
$ git clone git://android.git.kernel.org/platform/hardware/msm7k.git
$ git clone git://android.git.kernel.org/platform/prebuilt.git

3. 下載 Motorola Xt5 source code 並放到 ~/A688

https://opensource.motorola.com/sf/frs/do/viewRelease/projects.quenchxt/frs.xt5.xt502

4. 解開 source code

$ cd A688

$ tar –zxvf bionic.tar.gz

$ tar –zxvf dalvik.tar.gz

$ tar –zxvf external.tar.gz

$ tar –zxvf kernel.tar.gz

5. 從手機取出目前 kernel.gz 的 config 並放到 ~/A688/Kernel/

(1) 將手機連到電腦

(2) cd ~/A688/Kernel/

(3) adb pull /proc/config.gz config.gz

(4) gunzip config.gz 

(5) mv config .config

6. 設定環境變數

$ export PLATFORM_DIR=~/A688
$ export ARCH=arm
$ export CROSS_COMPILE=arm-eabi-
$ export PATH=~/A688/prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/bin:$PATH

7. 修改 Makefile

找到

KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \

                     -fno-strict-aliasing -fno-common \


                     -Werror \


                     -Werror-implicit-function-declaration

修改成

KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \

                     -fno-strict-aliasing -fno-common


  #                  -Werror \


  #                  -Werror-implicit-function-declaration

8. 開始編譯

$ make ANDROID_BUILD_TOP=
編好的 kernel 會在

 ~/A688/kernel/arch/arm/boot/zImage

9. 解開 boot.img 換成新的 kernel

$ cd ~/RomRepackTools_Linux

$ cp ~/A688/kernel/arch/arm/boot/zImage .

$ ./unpack-bootimg.pl boot.img

$ ./repack-bootimg.pl zImage boot.img-ramdisk boot_newkernel.img

10. 更新手機的 kernel

$ fastboot flash boot boot_newkernel.img