The documentation for the Freescale Android builds is not as clear as it could be, and (at the time of this post) is horribly out of date with the recent changes in Android build instructions. I'll attempt to clear up those as run across them.
My build machine is an Ubuntu 11.10 box that I keep pretty up to date. These build instructions will be focused primarily on that environment. YMMV.
Initialize Build Environment
Make sure you use the right Java implementation. On Ubuntu after installing the sun-java-jdk I had to do:
sudo update-alternatives --config jarSelect the sun Java instead of the default one for both options.
sudo update-alternatives --config java
Download Freescale Patches
Download the Freescale Android sources. I used the r10.3.1 (imx-android-r10.3.1) which requires you to download r10.3 and build it first. So, get imx-android-r10.3, and follow the instructions from the documentation bundle.
Freescale Android can be found here:
You need to register with Freescale to download their software bundles. You will need the documentation bundle as well as the source code bundle. The source code bundle I used is imx-android-r10.tar.gz. The documentation bundle that describes building it is Android IMX5X_R10_3_ANDROID_DOCS_BUNDLE.zip.
In order to get things to work I had to merge their instructions from the docs bundle and the instructions from android. Note, the Freescale patches in the r10.3 bundle are all based on Gingerbread.
Setup and Download Android
Note, if you have an older repo (anything more than a few weeks) you may need to delete your .repo directory and get the new repo (see above URL).
I used this repo:
repo init -u https://android.googlesource.com/platform/manifest -b gingerbread
repo syncGet Linux Kernel
You have to use git to download the kernel. You can not just copy it in. Unfortunately, the git command in the documentation no longer works. You have to use this one instead:
git clone git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.gitThen the following will work:
git checkout v220.127.116.11Get uBoot
Since the development board I'm using uses uBoot to boot Linux, I also got the uBoot code. Nothing special here, I just followed the instructions in section 2.1 of the r10.3 Users Guide from Freescale.
Patch Android for Freescale
Follow the Freescale instructions to patch for i.MX (section 2.2 of the r10.3 Users Guide).
The mtd-utils package was missing. This turned out to be a real pain. The sources you get from googlesource.com do not contain the mtd-utils package any more. After a lot of unsuccessful digging on the Internet, I finally just removed the packages from the patch system.
Remove the line from /opt/imx-android-r10.3/code/r10.3/baseversions that references mtd-utils.
Build uBoot and Kernel
Follow the Freescale instructions to build uBoot and the Linux kernel for i.MX (sections 2.3 and 2.4 of the r10.3 Users Guide).
Building Android (Gingerbread)
Follow the Freescale instructions to build Android after the Kernel and uBoot were built (section 2.5 of the r10.3 Users Guide).
For reference, the Android build instructions can be found here:
I am building on Ubuntu 11.10, and the C++ compiler doesn't like something in the base framework. I got the following error:
frameworks/base/libs/utils/RefBase.cpp: In member function ‘void android::RefBase::weakref_type::trackMe(bool, bool)’:And found a resolution here:
frameworks/base/libs/utils/RefBase.cpp:483:67: error: passing ‘const android::RefBase::weakref_impl’ as ‘this’ argument of ‘void android::RefBase::weakref_impl::trackMe(bool, bool)’ discards qualifiers [-fpermissive]
make: *** [out/host/linux-x86/obj/STATIC_LIBRARIES/libutils_intermediates/RefBase.o] Error 1
cd frameworks/base/ git cherry-pick c4fbbe06
The next problem I encountered was this error:
error: "_FORTIFY_SOURCE" redefined [-Werror]I found the resolution here:
-HOST_GLOBAL_CFLAGS += -D_FORTIFY_SOURCE=0The build continued nicely.
+HOST_GLOBAL_CFLAGS += -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0
The final error I ran into was with the CellBroadcastReceiver. It was missing symbols. Since I don't need it for my headless android project, I just deleted the source directory packages/apps/CellBroadcastReceiver.
Tip To Remember
If, after you build the code, you notice in the process list that the boot logo keeps showing up, and that things are restarting over and over, connect up adb and look at the logcat. Usually you will see some Null Pointer exception. What I've found is that, with a proper build, sometimes things will crash with old data in the DATA partition. That partition needs to be wiped clean to get rid of the old data.