Build Android

Get and patch the Android source code

Download the Android patch file

$ cd <ANDROID_WORKING_DIR>/device

then download the patch file from following link into the folder：

Description	Resource URL	Features
Android source code patch	Android-2.3.7_r1.tar.gz (~ 4 MB)	Stagefright plugin for hardware video decoder in sam9m10 chips Use H&D SDIO WIFI driver Add camera application Add the touchscreen calibration application to Android Add IP configure application to Android Add configuration files for Android system initialization and ALSA system

Extract the patch file in vendor folder:

$ tar -zxvf Android-2.3.7_r1.tar.gz

Now you can see a new folder < ANDROID_WORKING_DIR >/device/atmel.

Configure and Build Android

Configure compiling environment, take SAM9M10 MCU as an example:

      $ cd <ANDROID_WORKING_DIR>
      $ make clean
      $ source build/envsetup.sh
      $ partner_setup sam9m10
      $ choosecombo Device release sam9m10 eng

build/envsetup.sh

This is to setup Android build environment.

choosecombo

This is used to configure the building environment

• Syntax:
  

  choosecombo [Device|Simulator] [release|debug] [device_name] [variants]

• Parameters of choosecombo
  • Device, used for real device, not simulator
  • Simulator, used for simulator
  • release, used for release version
  • debug, used for debug version
  • variants, three options: user | userdebug | eng. For detailed information, please goto http://source.android.com/source/building.html and have a look at section "Choose a Target".

More about partner_setup

partner_setup is a method to copy the modified code from device/atmel to its original space. This command just changes the space to location. Therefore, if you modify the code under device/atmel, you need to run partner_setup before rebuild the your code.
For SAM9G45 MCU, please execute

      $ partner_setup sam9g45 
      $ choosecombo Device release sam9g45 eng

For SAM9X5 MCU, please execute

      $ partner_setup sam9x5
      $ choosecombo Device release sam9x5 eng

When the configuration is finished, the messages will be similar as following:

      PLATFORM_VERSION_CODENAME=REL
      PLATFORM_VERSION=2.3.7
      TARGET_PRODUCT=sam9m10
      TARGET_BUILD_VARIANT=eng
      TARGET_SIMULATOR=false
      TARGET_BUILD_TYPE=release
      TARGET_BUILD_APPS=
      TARGET_ARCH=arm
      HOST_ARCH=x86
      HOST_OS=linux
      HOST_BUILD_TYPE=release
      BUILD_ID=GWK74

• Run make

        $ make
  

• Note that if your host machine has multiple CPU cores, you can use

        $ make -j2
  

  or

        $ make -j4
  

  to speed up the building process.
• If all goes well, a new folder “out” under the current directory will be newly created. You will see message as follows.

  Generated: (out/target/product/sam9m10/android-info.txt)
  Target system fs image: out/target/product/sam9m10/obj/PACKAGING/systemimage_intermediates/system.img
  Install system fs image: out/target/product/sam9m10/system.img
  Target ram disk: out/target/product/sam9m10/ramdisk.img
  Target userdata fs image: out/target/product/sam9m10/userdata.img
  Installed file list: out/target/product/sam9m10/installed-files.txt
  

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For more information, you can refer to Android web site: http://source.android.com/porting/build_system.html

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See also: GenerateAndroidImage, AndroidRootfs, GetAndroid