Android porting for dummies @droidconin 2011

Android Porting Amit Pundir Android Engineer, Linaro [email_address] @pundiramit

Agenda For This Session ,[object Object]

Android Open Source Project ,[object Object]

Target Build Configurations ,[object Object]

Android Debugging/Troubleshooting

Applications Applications Application Frameworks Libraries & Runtime Linux Kernel Audio Display Hardware Abstraction Layers Firmware Binaries WiFi Binder Camera Logger ... GPS Radio (RIL) Camera Media NFS Sensors Audio ... Skia Core Libraries Dalvik VM ... SQlite ALSA Freetype Input Webkit System Services Power Manager Activity Manager Content Manager Battery Service Location Manager Audio Service Network Manager Package Manager Window Manager ... Home Settings Media Player Camera Dialer ... Media Server Service Manager ...

Android Open Source Project (AOSP)

Heads up: Preparing Development Machines for AOSP ,[object Object],-> 06GB of download -> 25GB disk space to do single build -> 80GB disk space to build all AOSP configs -> 16GB RAM recommended -> 5+ hours of CPU time for a single build on a 2x quad-core 2.4 GHz HT with 24GB RAM and no SSD. ,[object Object],-> 64bit Ubuntu-10.04. Workarounds available to build AOSP on 32bit machines as well. -> Sun-Java6, git, build-essentials, libgl1-mesa, libc6 ... etc

AOSP Code Access ,[object Object],[object Object],-> No Git web preview and Gerrit available yet. ,[object Object],-> Git Wrapper script to download AOSP. ,[object Object]

AOSP Code Access (contd.) ,[object Object],-> `repo` initialization. ,[object Object],-> Start download or sync-up. Example: $ repo init -u https://android.googlesource.com/platform/manifest -b android-4.0.1_r1 $ repo sync

bionic Android's C library. bootable Legacy Bootloader/Recovery code for reference build AOSP Build framework cts Android's Compatibility Test Suite dalvik Dalvik Virtual Machine development Development tools #tutorials #monkey device Vendor specific configuration files external External projects used in AOSP frameworks Android core application framework hardware Hardware specific libraries/modules #HAL kernel Linux Kernel libcore Apache Harmony. Free Java implementation. Used by Dalvik. ndk Native Development Kit packages AOSP's stock applications prebuilt Prebuilt binaries such as Toolchain sdk Android's Software Development Kit system Android's core system libraries/binaries #init #toolbox #adb

Android Kernel ,[object Object]

Android maintains `android-common` tree -> Android patches on top of Linus's base tree. ,[object Object]

Android Kernel Features ,[object Object],-> Android's IPC mechanism. Inspired from Open Binder project. ,[object Object],-> Shared memory allocator. Discards shared units under memory pressure. ,[object Object],-> Android's driver which logs data from user space. ,[object Object],-> Prevents a system to enter suspend or low power states.

Android Kernel Features (contd.) ,[object Object],-> Aggressive OOM handler. Triggers before Kernel's default implementation. ,[object Object],-> Android's alarm timer implementation on top of Kernel's RTC implementation. ,[object Object],-> Logs last Kernel log. Accessible through /proc/last_kmsg ,[object Object],-> Network administration through uid/pid e.g AID_NET_*

Android Hardware Abstraction Layers ,[object Object],-> Hooked to System at run time using hw_get_module() or dynamic linking, dlopen() ,[object Object]

AOSP Build System ,[object Object],-> . build/envsetup.sh -> Setting up build environment -> lunch -> Choose the TARGET_PRODUCT -> export USE_CCACHE = 1 -> will cache object files generated by the C/C++ compiler which can be used to speed up next build. -> make -jX -> where X = “number of CPU cores in your build machine” + 1. OR -> m , mm or mmm -> make aliases which is handy while building AOSP projects independently.

AOSP Build configuration ,[object Object],[object Object],[object Object]

Target Build/Run time configuration ,[object Object],[object Object],[object Object],[object Object]

Android porting for dummies @droidconin 2011

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