I'd like to modify and build my own Android for my Samsung Galaxy Note I've downloaded Android 4.1.2 from http://source.android.com and Samsung open source for my Samsung Galaxy Note.

After extract Samsung open source, I get 2 folders: Kernel and Platform, and 2 README text file

README_Kernel.txt

1. How to Build
- get Toolchain
    From android git server , codesourcery and etc ..
     - arm-eabi-4.6

- edit build_kernel.sh
    edit "CROSS_COMPILE" to right toolchain path(You downloaded).
      EX)  CROSS_COMPILE= $(android platform directory you download)/android/prebuilts/gcc/linux-x86/arm/arm-eabi-4.6/bin/arm-eabi-
  Ex)  CROSS_COMPILE=/usr/local/toolchain/arm-eabi-4.6/bin/arm-eabi-         // check the location of toolchain

- execute Kernel script 
$ ./build_kernel.sh

2. Output files
- Kernel : arch/arm/boot/zImage
- module : drivers/*/*.ko

3. How to Clean 
    $ make clean

README_Platform.txt

[Step to build]
1. Get android open source.
: version info - Android 4.1
( Download site : http://source.android.com )

2. Copy module that you want to build - to original android open source
If same module exist in android open source, you should replace it. (no overwrite)

# It is possible to build all modules at once.


3. You should add module name to 'PRODUCT_PACKAGES' in 'build\target\product\core.mk' as following case.
case 1) bluetooth : should add 'audio.a2dp.default' to PRODUCT_PACKAGES
case 2) e2fsprog : should add 'e2fsck' to PRODUCT_PACKAGES
case 3) libexifa : should add 'libexifa' to PRODUCT_PACKAGES
case 4) libjpega : should add 'libjpega' to PRODUCT_PACKAGES
case 5) KeyUtils : should add 'libkeyutils' to PRODUCT_PACKAGES
case 6) bluetoothtest\bcm_dut : should add 'bcm_dut' to PRODUCT_PACKAGES

ex.) [build\target\product\core.mk] - add all module name for case 1 ~ 6 at once

    PRODUCT_PACKAGES += \
        e2fsck \
        libexifa \
        libjpega \
        libkeyutils \
        bcm_dut \
        audio.a2dp.default

4. In case of 'bluetooth', you should add following text in 'build\target\board\generic\BoardConfig.mk'

BOARD_HAVE_BLUETOOTH := true
BOARD_HAVE_BLUETOOTH_BCM := true

5. excute build command
./build.sh user

What I need to do after followed 2 above files