Android

Announcing Android4Beagle

Chris Simmonds has been working on ports of Android to the BeagleBone Black for several years, since he posted the first tutorial on running JellyBean 4.3.

Now all of that work has been consolidated into the Android4Beagle project. Android4Beagle aims to provide a vanilla Android build, based on AOSP. Currently, builds are available for KitKat, Lollipop and Marshmallow, with Nougat in the works.

Building Brillo: first impressions

Brillo (https://developers.google.com/brillo/) is Google's operating system for devices that are connected to the IoT. They communicate with each other, with the cloud and with mobile apps using a system called Weave (https://developers.google.com/weave/). Brillo and Weave are still under wraps: you have to request an invite from the two links in order to get access to documentation, sample code, and so on. However, there is enough information publicly available to build and test a device running Brillo, which is what this blog is about. I hope to cover Weave in a later post.

Brillo is actually a cut-down version of Android. Basically, all the Java components have been stripped away leaving a much simpler embedded Linux operating system. When building Brillo, some things pop out immediately, which may give a preview of future Android builds:

  • GNU make is out: the build is run by kati/ninja (same for Android N preview)
  • GCC is out: almost all C/C++ components are compiled using clang (same for Android N preview)
  • Linux kernel source is in: the AOSP tree has vendor kernels in hardware/bsp/kernel. The kernel is built using GCC, as it is not (yet) possible to build it with clang
  • DBUS is in: I have not yet found out why
  • Toybox is in: leading to a much more Linux-like command line experience

Below, I show how to build and run the Brillo emulator

Android 5.1 Lollipop for BeagleBone Black

At last, here is Android Lollipop for BeagleBone Black!

Screenshot of BeagleBone running 5.1 Lollipop

Installing Google apps on BeagleBone

Once you have ported AOSP to your platform, an obvious next step is to install some apps: maybe Gmail or Angry Birds. Ideally, you would want Google Play Store so that you can select apps from the 100,000's available. But, there is a problem. Play Store, like most of the apps on Play Store, requires Google Mobile Services (GMS) to work. GMS extends the Android framework by adding the libraries, configuration files and applications required to support the extended Google APIs that most developers know simply as Google Services. Most of these components are in the system partition so either they have to be included as part of the base AOSP build or installed as root afterwards. There is also a licensing issue: the components that make up GMS and applications like Gmail, Google Maps and Google Now are proprietary to Google and require a license.

Updated images for Android KitKat on BeagleBone Black

I have updated the internal eMMC flash and sdcard images for BeagleBone Black. Most changes are to make U-Boot work better with fastboot, especially to make it possible to enter fastboot without having to type "fastboot" at a U-Boot prompt and so avoid the need to have a serial cable. Also, I have increased the sizes of the system and userdata partitions so that you can install more apps. I am still using Android KitKat 4.4.4 and TI Linux 3.2 kernel with SGX accelerated graphics libraries.

Android sparse image format

Fastboot

Many Android bootloaders implement the fastboot protocol for loading and flashing images to internal memory (there is some background information about how Android boots and boot image formats in these slides: http://www.slideshare.net/chrissimmonds/android-bootslides20). Fastboot is a simple USB protocol using ASCII text strings for commands and responses. In recent versions of the AOSP you can find the specification in system/core/fastboot/fastboot_protocol.txt.

KitKat 4.4 AOSP for BeagleBone Black with accelerated graphics

After a little bit of tweaking I have got my port of Android KitKat up and running on the BeagleBone Black. For some background on why I am doing this, read my previous post about Android on the BeagleBone Black

How Android finds OpenGL libraries, and the death of egl.cfg

Everybody who works on Android platform development knows that the vendor OpenGL libraries are located using information in egl.cfg. As of Android Kit Kat 4.4, they are out of date. Read on to find out why.

Building Jelly Bean 4.3 AOSP for Beaglebone Black v2.0 - with fastboot

A little while ago I wrote Building Jelly Bean 4.3 AOSP for Beaglebone Black which describes how to install Android on a micro SD card and boot the BeagleBone from it. Then I did some research on integrating fastboot into U-Boot and wrote Android fastboot for BeagleBone Black. Now I am bringing the two together.

I did think about editing the first article, but I think it is cleaner to have a new tutoruial that works for the new use case.

Android fastboot for BeagleBone Black

In this article I describe how to install U-Boot with Android fastboot support on a BeagleBone Black, which means that you can install new Android images onto the internal eMMC memory over a USB cable using the normal “fastboot” command-line tool.

Syndicate content