Android/Building

How to build an Android and OLPC OS dual-boot image for XO-4.

Ingredients

set up a build environment, see Initializing a Build Environment,
install Repo, by following only the Installing Repo section of the Downloading the Source guide,
use Repo to download the Android source from OLPC repositories,

$ repo init -u git://dev.laptop.org/users/ben/android_manifest -b android-4.3.1-xo4
$ repo sync

if you would like to include google services, download developer package from here gapps. See also Google Apps

$ tar -zxvf gapps.tar.gz
$ mv gapps vendor/olpc/xo4/

$ . build/envsetup.sh
$ lunch 14
$ make installclean && make -j8 && make userdatatarball

(the 14 means to build engineer version ... use command "lunch" to list all the build options, Android/Building/Variants Build Variants)
(the -j8 means to run eight concurrent threads of build ... the number of threads should be chosen according to how many CPU cores your build environment has access to.)

install the android-tools-fsutils package or ensure you have simg2img tools in your /usr/bin/ simg2img
create zd file:

$ cd vendor/olpc/xo4/mkzd
$ sudo ./mkzd.sh

ensure you have a copy of the OLPC OS Linux, Sugar and Gnome build file, e.g. 32014o4.zd,

$ cd vendor/olpc/xo4/sugar-combiner
$ make
$ sudo ./mkzd.sh

To merge an already published Android build with an already published OLPC OS derived build:

download the system.img, ramdisk.img, and kernel files from the Android build directory,
download the build derived from OLPC OS, e.g. 32014xx4.zd or 4_0b125.zd,
download the mkzd.sh tool (from http://dev.laptop.org/git/users/quozl/mkzd/ or http://dev.laptop.org/git/users/ben/android_vendor_olpc_xo4/ ), and edit it to match file names,
run mkzd.sh

source code for building Android is a combination of 4 parts.

You can also download kernel image form device/olpc/xo4-kernel git repository if you don't want to change kernel

source code from google AOSP project branch "android-4.3.1_r1". "Downloading the Source" guide
OLPC patches for AOSP project.

frameworks/av	git repository
frameworks/base	git repository
frameworks/native	git repository
system/core	git repository
hardware/libhardware	git repository
hardware/libhardware_legacy	git repository
hardware/marvell	git repository
build	git repository
bionic	git repository
external/bluetooth/bluedroid	git repository
external/kernel-headers	git repository
external/webkit	git repository
packages/apps/Calendar	git repository
packages/apps/Gallery2	git repository
packages/apps/Launcher2	git repository
packages/providers/CalendarProvider	git repository