1. Android build
	- Download original android source code ( Jelly Bean 4.1 ) from http://source.android.com
	- Unzip opensource packages of LU6200_Android_JB_LU620187_00_Android.tar.gz into downloaded android source directory
	- And, merge the source into the android source code(Jelly Bean)
	- Run following scripts to build android
	  a) . build/envsetup.sh
	  b) lunch 1
	  c) make -j4
	- When you compile the android source code, you have to add google original prebuilt source(toolchain) into the android folder 
	- After build, you can find output at out/target/product/generic

2. Kernel build
	- Install Sourcery G++ Lite 2009q3-68 toolchain for ARM EABI.
	  Visit http://www.codesourcery.com/, download and install the toolchain. 
	- Untar the kernel source using following command at the android folder
	  tar zxvf LU6200_Android_JB_LU620187_00_Kernel.tar.gz
	- Execute the following build scripts in the kernel root folder.
	  make ARCH=arm CROSS_COMPILE=arm-eabi- ijb_lgu_defconfig
	  make ARCH=arm CROSS_COMPILE=arm-eabi- zImage -j4
	- If the kernel is built successfully, you can find the build image at arch/arm/boot
