Ching's blog

First to install:
$ sudo apt-get install git-core gnupg sun-java6-jdk flex bison gperf libsdl-dev libesd0-dev libwxgtk2.6-dev build-essential zip curl libncurses5-dev zlib1g-dev minicom

Download Android SDK:
http://developer.android.com/sdk/1.5_r2/index.html
Extract to ~/

Download ARM compiler Toolchain:
http://www.codesourcery.com/sgpp/lite/arm/releases/2008q3
Please select "ARM GNU/Linux"
Extract to ~/

Setting ~/.bashrc:
export PATH=${PATH}:/home/henry/android-sdk-linux_x861.5_r1/tools:/home/henry/arm-2008q1/bin
export ANDROID_JAVA_HOME=/usr/lib/jvm/java-6-sun/bin

Install repo:
$ sudo apt-get install curl
$ cd ~
$ mkdir bin
$ echo $PATH
$ curl http://android.git.kernel.org/repo > ~/bin/repo
$ chmod a+x ~/bin/repo

Download source code of cupcake:
$ cd ~
$ mkdir myandroid
$ cd myandroid
$ ~/bin/./repo init -u git://android.git.kernel.org/platform/manifest.git -b cupcake
$ ~/bin/./repo sync
P.S. If "repo sync" can not complete, use "git clone git://android.git.kernel.org/ + project path." to get particular project