Deep Dive into the AOSP
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This document provides an overview of the steps to build and install the Android Open Source Project (AOSP) from source. It discusses initializing a build environment, downloading the AOSP source tree and device drivers, building and installing the AOSP build on a Nexus 5 device. The build process involves initializing a repo client, syncing the source code, choosing a target, and running make. The installed AOSP build can then be used to power an unlocked Nexus 5 device.
Deep Dive into the AOSP
- 1. Deep Dive into the AOSP Android Open Source Project
- 2. Dr. Ketan Parmar Sr. Tech Lead – InfoStretch Solutions Pvt. Ltd. @kpbird +ketanparmar www.kpbird.com
- 3. Understand AOSP Requirement Initializing a Build Environment Download Source Tree Download Device Drivers Build AOSP Install AOSP
- 4. Understand AOSP Requirement Initializing a Build Environment Download Source Tree Download Device Drivers Build AOSP Install AOSP
- 5. Android open source project • Android is an open-source software stack for a wide range of mobile devices and a corresponding open-source project led by Google • It’s commonly referred as AOSP • AOSP has 450+ projects • www.source.android.com • www.b.android.com • https://android-review.googlesource.com/
- 9. Understand AOSP Requirement Initializing a Build Environment Download Source Tree Download Device Drivers Build AOSP Install AOSP
- 10. Requirement • Operating System: Linux (Ubuntu) or Mac • Environment : 64 bit • Disk Space for Source : 40 GB • Disk Space for Build : 100 GB • Software Requirements : • Python 2.6 -- 2.7 • GNU Make 3.81 -- 3.82 • JDK 7 • Git 1.7 or newer
- 11. Repo, Gerrit, Manifest • Repo is a repository management tool that google has built on top of Git. Repo unifies the many Git repositories when necessary, does the uploads to our revision control system. • Gerrit is a web-based code review system for projects that use git. Gerrit encourages more centralized use of Git by allowing all authorized users to submit changes, which are automatically merged if they pass code review • Manifest – A manifest file is an XML file, describing a list of repositories to sync our working directory with.
- 12. Understand AOSP Requirement Initializing a Build Environment Download Source Tree Download Device Drivers Build AOSP Install AOSP
- 13. Initializing a Build Environment • Install JDK-7 $ sudo apt-get update $ sudo apt-get install openjdk-7-jdk • Required package for Ubuntu 14.x $ sudo apt-get install bison g++-multilib git gperf libxml2-utils
- 14. Install Repo • Make sure you have a bin/ directory in your home directory and that it is included in your path: $ mkdir ~/bin $ PATH=~/bin:$PATH • Download the Repo tool and ensure that it is executable: $ curl https://storage.googleapis.com/git-repo- downloads/repo > ~/bin/repo $ chmod a+x ~/bin/repo
- 15. Understand AOSP Requirement Initializing a Build Environment Download Source Tree Download Device Drivers Build AOSP Install AOSP
- 16. Initialization Repo Client • Create an empty directory to hold your working files. If you're using MacOS, this has to be on a case-sensitive filesystem. Give it any name you like: $ mkdir AOSP $ cd AOSP • Run repo “init” to bring down the latest version of Repo with all its most recent bug fixes. $ repo init -u https://android.googlesource.com/platform/manife st
- 17. Download Source Tree • Download Source Tree $ repo sync –j(--jobs) • It will download almost 40 GB.
- 18. Deep Dive into the Source Tree
- 19. Deep Dive into the Source Tree • Bionic - the C-runtime for Android. Note that Android is not using glibc like most Linux distributions. • Bootable - boot and startup related code. • Build - the build system implementation including all the core make file templates. • Cts - the compatability tests. The test suite to ensure that a build complies with the Android specification. • Dalvik - the source code for the implementation of the Dalvik Virtual Machine
- 20. Deep Dive into the Source Tree • Development - projects related to development such as the source code for the sdk and ndk tools • Device - product specific code for different devices. • External - contains source code for all external open source projects such as SQLite, Freetype and webkit. • Frameworks - this folder is essential to Android since it contains the sources for the framework. Here you will find the implementation of key services such as the System Server with the Package- and Activity managers.
- 21. Deep Dive into the Source Tree • Hardware - hardware related source code such as the Android hardware abstraction layer specification and implementation. • Out - the build output will be placed here after you run make. • Packages - contains the source code for the default applications such as contacts, calendar, browser. • Prebuilt - contains files that are distributed in binary form for convenience. • System - source code files for the core Android system. That is the minimal Linux system that is started before the Dalvik VM and any java based services are enabled.
- 22. Understand AOSP Requirement Initializing a Build Environment Download Source Tree Download Device Drivers Build AOSP Install AOSP
- 23. Build for Device
- 24. Download Drivers for the Device https://developers.google.com/android/nexus/drivers
- 25. Extract Drivers for the Device
- 26. Extract Drivers for the Device
- 27. Understand AOSP Requirement Initializing a Build Environment Download Source Tree Download Device Drivers Build AOSP Install AOSP
- 28. Build AOSP • Initialize Build Environment $ source build/envsetup.sh or $ . build/envsetup.sh • Choose Target $ lunch
- 29. Build AOSP
- 30. Build AOSP • Choose Target $ lunch • Press 8 and enter • Start build with make command $ make -j4
- 31. Wait…….
- 32. Output
- 33. Understand AOSP Requirement Initializing a Build Environment Download Source Tree Download Device Drivers Build AOSP Install AOSP
- 34. Install AOSP Build in Nexus 5 fastboot oem unlock fastboot flash recovery recovery.img fastboot flash boot boot.img fastboot flash cache cache.img fastboot flash userdata userdata.img fastboot flash system system.img fastboot reboot
- 35. Enjoy… You own build…
- 37. Helper functions • croot: change directory to the top of the tree • m: execute 'make' from the top of the tree • mm - builds all of the modules in the current directory • mmm <dir1>: build all of the modules in the supplied directories • cgrep <pattern>: grep on all local C/C++ files • jgrep <pattern>: grep on all local Java files • resgrep <pattern>: grep on all local res/*.xml files • godir <filename>: go to the directory containing a file
- 38. Dr. Ketan Parmar Sr. Tech Lead – InfoStretch Solutions Pvt. Ltd. @kpbird +ketanparmar www.kpbird.com Thank You