Compile android source and kernel for emulator in Debian

　　1、download the android source code

　　Reference from

http://source.android.com/source/downloading.html

　　follow the reference:

　　Create the dir and export the PATH

$ mkdir ~/bin
$ PATH=~/bin:$PATH

　　Download the repo

$ curl https://dl-ssl.google.com/dl/googlesource/git-repo/repo > ~/bin/repo
$ chmod 775 ~/bin/repo

　　Repo init the code version you want

$ repo init -u https://android.googlesource.com/platform/manifest -b android-4.0.1_r1

　　finally sync the codes

$ repo sync
// better way
$ repo sync -j16

　　if try to stop the repo, just try

Ctrl + z   

　　and continue the repo

$ repo sync
// or
$ repo sync -j16

　　after download, must enter "repo sync" to check the code again.

　　2、download the kernel

　　Reference from

https://android.googlesource.com/

　　click the kernel/common, there would be a instruction on the top:

git clone https://android.googlesource.com/kernel/common

　　the version for emulator

git clone https://android.googlesource.com/kernel/goldfish

　　3、Compile the source code

　　1) check the build environment

http://source.android.com/source/initializing.html

　　2) compile

$ cd ~/Android/source_code/
$ make
// or
$ make -j4

　　3) there would be the files in the following dir

$ ls out/host/linux-x86/bin/ | grep emulator
emulator
emulator64-arm
emulator64-mips
emulator64-x86
emulator-arm
emulator-mips
emulator_renderer
emulator-ui
emulator-x86
$ ls out/target/product/generic/ | grep img
ramdisk.img
system.img
userdata.img

　　4、 Compile the kernel

$ cd goldfish/
$ ls

　　but there is no files now.

　　checkout for the real codes.

$ git checkout
android-goldfish-2.6.          master                           origin/linux-goldfish-3.0-wip
android-goldfish-3.4             origin/android-goldfish-2.6.   origin/master
HEAD                             origin/android-goldfish-3.4
linux-goldfish-3.0-wip           origin/HEAD           

　　choose the version you want

$ git checkout android-goldfish-2.6.
Checking out files: % (/), done.
Branch android-goldfish-2.6. set up to track remote branch android-goldfish-2.6. from origin.
切换到一个新分支 'android-goldfish-2.6.29'

　　then

$ ls
arch     CREDITS        drivers   include  Kbuild  MAINTAINERS  net             samples   sound
block    crypto         firmware  init     kernel  Makefile     README          scripts   usr
COPYING  Documentation  fs        ipc      lib     mm           REPORTING-BUGS  security  virt

　　compile the kernel

　　1) crrect the Mafile

$ vim Makefile
//correct the following messenge
#ARCH           ?= $(SUBARCH)
ARCH            ?= arm
CROSS_COMPILE   ?= arm-none-linux-gnueabi-

　　2) make menuconfig

$ make menuconfig
>> Save an Alternate Configuration File       

　　3) make

　　TIPS : there would be error without libnucurses

$ sudo apt-get install libncurses5 libncurses5-dev
// in AMD64
$ sudo apt-get install libncurses5 libncurses5-dev
$ sudo apt-get install ia32-libs
$ sudo apt-get install lib32ncurses5 lib32ncurses5-dev