OP-TEE build.git

Contents

1. Introduction
2. Why repo?
3. Here is bunch of other stuff in this git to, why?
4. How do I build using AOSP / OpenEmbedded?
5. Platforms supported by build.git
6. Manifests
7. Get and build the solution
8. FAQ

1. Introduction

Why this particular git? Well, as it turns out it's totally possible to put together everything on your own. You can build all the individual components, os, client, xtest, Linux kernel, ARM-TF, TianoCore, QEMU, BusyBox etc and put all the binaries at correct locations and write your own command lines, Makefiles, shell-scripts etc that will work nicely on the devices you are interested in. If you know how to do that, fine, please go a head. But for newcomers it's way to much behind the scenes to be able to setup a working environment. Also, if you for some reason want to run something in an automated way, then you need something else wrapping it up for you.

With this particular git built.git our goal is to:
Make it easy for newcomers to get started with OP-TEE using the devices we've listed in this document.

2. Why repo?

We discussed alternatives, initially we started out with having a simple shell-script, that worked to start with, but after getting more gits in use and support for more devices it started to be difficult to maintain. In the end we ended up choosing between repo from the Google AOSP project and git submodules. No matter which you choose, there will always be some person arguing that one is better than the other. For us we decided to use repo. Not directly for the features itself from repo, but for the ability to simply work with different manifests containing both stable and non-stable release. Using some tips and tricks you can also speed up setup time significantly. For day to day work with commits, branches etc we tend to use git commands directly.

3. Here is bunch of other stuff in this git to, why?

If we count the number of gits used in for example a QEMU based OP-TEE setup we have 14 different gits in use. Either we document tiny bits in each git or we try to combine as much as possible in a common place. We believe it's better to combine as much as possible, so that it should be easy for the user of OP-TEE to know where to look for information. We've discussed the option of having some information at optee.org, but we concluded that it's quite nice to have it in some of our source code gits, so that the documentation is accurate for a certain version of OP-TEE. I.e, step back to an older stable release and the documentation in the git will reflect the current state at that point in time. So, this particular git, will contain information about how to build, deploy and test OP-TEE on some devices that we have in our possession. The builds that we cover here are as small as possible and is based on an initramfs based filesystem (using BusyBox) and the least amount of gits needed to boot up and run xtest. Since we are using repo, we will also list and describe the manifests we are using here.

Besides that, this git also contains information that are device specific, it could be as simple as some tips and tricks or for example how to run JTAG on a certain device. We've also put the entire FAQ in this git.

4. How do I build using AOSP / OpenEmbedded?

It's possible, we have teams in Linaro doing that and we even have some limited experience doing such builds in the OP-TEE team. But, both of those builds are rather big and is a bit too much for us on daily basis. AOSP easily ends up with +80GB builds which takes hours and OE builds we've tried ends up with 15-20GB and also takes quite some time. Eventually we will point to some guide in the future or we will include it as a subsection or something in this git.

5. Platforms supported by build.git

Below is a table showing the platforms supported by build.git. OP-TEE as such supports many more platforms, but since quite a few of the other platforms are maintained by people outside Linaro or are using a special setup, we encourage you to talk to the maintainer of that platform directly if you have build related questions etc. Please see the MAINTAINERS.md file for contact information.

Platform	Composite PLATFORM flag	Publicly available?
ARM Juno Board	PLATFORM=vexpress-juno	Yes
ARM Foundation FVP	PLATFORM=vexpress-fvp	Yes
HiKey Board (HiSilicon Kirin 620)	PLATFORM=hikey	Yes
MediaTek MT8173 EVB Board	PLATFORM=mediatek-mt8173	No
QEMU	PLATFORM=vexpress-qemu_virt	Yes
QEMUv8	PLATFORM=vexpress-qemu_armv8a	Yes
Raspberry Pi 3	PLATFORM=rpi3	Yes
Texas Instruments DRA7xx	PLATFORM=ti-dra7xx	Yes
Texas Instruments AM57xx	PLATFORM=ti-am57xx	Yes
Texas Instruments AM43xx	PLATFORM=ti-am43xx	Yes

6. Manifests

Here is a list of manifests for the devices currently supported.

Target	Latest (non-stable)	Stable	Device doc
QEMU	default.xml	default_stable.xml	qemu.md
QEMUv8	qemu_v8.xml	qemu_v8_stable.xml
FVP	fvp.xml	fvp_stable.xml	fvp.md
HiKey	hikey.xml	hikey_stable.xml	hikey.md
HiKey Debian	hikey_debian.xml	hikey_debian_stable.xml	hikey.md
MediaTek MT8173 EVB Board	mt8173-evb.xml	mt8173-evb_stable.xml	mtk8173.md
ARM Juno board	juno.xml	juno_stable.xml	juno.md
Raspberry Pi 3	rpi3.xml	rpi3_stable.xml	rpi3.md
DRA7xx	dra7xx.xml	dra7xx_stable.xml	ti.md
AM57xx	am57xx.xml	am57xx_stable.xml	ti.md
AM43xx	am43xx.xml	am43xx_stable.xml	ti.md

7. Get and build the solution

Below we will describe the general way of getting the source, building the solution and how to run xtest on the device. For device specific instructions, see the respective device.md file in the docs folder.

7.1 Prerequisites

We believe that you can use any Linux distribution to build OP-TEE, but as maintainers of OP-TEE we are mainly using Ubuntu-based distributions and to be able to build and run OP-TEE there are a few packages that needs to be installed to start with. Therefore install the following packages regardless of what target you will use in the end.

$ sudo apt-get install android-tools-adb android-tools-fastboot autoconf \
	automake bc bison build-essential cscope curl device-tree-compiler flex \
	ftp-upload gdisk iasl libattr1-dev libc6:i386 libcap-dev libfdt-dev \
	libftdi-dev libglib2.0-dev libhidapi-dev libncurses5-dev \
	libpixman-1-dev libssl-dev libstdc++6:i386 libtool libz1:i386 make \
	mtools netcat python-crypto python-serial python-wand unzip uuid-dev \
	xdg-utils xterm xz-utils zlib1g-dev

7.2 Install Android repo

Note that here you don't install a huge SDK, it's simply a Python script that you download and put in your $PATH, that's it. Exactly how to "install" repo, could be found in the Google repo pages, so follow those instructions before continuing.

7.3 Get the source code

Choose the manifest corresponding to the platform you intend to use. For example, if you intend to use Raspberry Pi3, then ${TARGET}.xml should be rpi3.xml. The repo sync step will take some time if you aren't referencing an existing tree (see Tips and Tricks below).

$ mkdir -p $HOME/devel/optee
$ cd $HOME/devel/optee
$ repo init -u https://github.com/OP-TEE/manifest.git -m ${TARGET}.xml [-b ${BRANCH}]
$ repo sync

7.4 Get the toolchains

In OP-TEE we're using different toolchains for different targets (depends on ARMv7-A ARMv8-A 64/32bit solutions). In any case start by downloading the toolchains by:

$ cd build
$ make toolchains

7.5 Build the solution

We've configured our repo manifests, so that repo will always automatically symlink the Makefile to the correct device specific makefile, that means that you simply start the build by running:

$ make

This step will also take some time, but you can speed up subsequent builds by enabling ccache (again see Tips and Tricks).

7.6 Flash the device

On non-emulated solutions, you will need to flash the software in some way. We've tried to "hide" that under the following make target:

$ make flash

But, since some devices are trickier to flash than others, please see the device specific files. See this just as a general instruction.

7.7 Boot up the device

This is device specific.

7.8 Load tee-supplicant

On some solutions tee-supplicant is already loaded ($ ps aux | grep tee-supplicant) on other not. If it's not loaded, then start it by running:

$ tee-supplicant &

If you've built using our manifest you should not need to modprobe any OP-TEE/TEE kernel driver since it's built into the kernel in all our setups.

7.9 Run xtest

The entire xtest test suite has been deployed when you we're running $ make run in previous step, i.e, in general there is no need to copy any binaries manually. Everything has been put into the root FS automatically. So, to run xtest, you simply type:

$ xtest

If there are no regressions / issues found, xtest should end with something like this:

+-----------------------------------------------------
23476 subtests of which 0 failed
67 test cases of which 0 failed
0 test case was skipped
TEE test application done!

7.10 Tips and Tricks

7.10.1 Reference existing project to speed up repo sync

Doing a repo init, repo sync from scratch can take a fair amount of time. The main reason for that is simply because of the size of some of the gits we are using, like for the Linux kernel and EDK2. With repo you can reference an existing forest and by doing so you can speed up repo sync to taking 20 seconds instead of an hour. The way to do this are as follows.

1. Start by setup a clean forest that you will not touch, in this example, let us call that optee-ref and put that under for $HOME/devel/optee-ref. This step will take roughly an hour.
2. Then setup a cronjob (crontab -e) that does a repo sync in this folder particular folder once a night (that is more than enough).
3. Now you should setup your actual tree which you are going to use as your working tree. The way to do this is almost the same as stated in the instructions above, the only difference is that you reference the other local forest when running repo init, like this

   repo init -u https://github.com/OP-TEE/manifest.git --reference /home/jbech/devel/optee-ref
   

4. The rest is the same above, but now it will only take a couple of seconds to clone a forest.

Normally step 1 and 2 above is something you will only do once. Also if you ignore step 2, then you will still get the latest from official git trees, since repo will also check for updates that aren't at the local reference.

7.10.2 Use ccache

ccache isfaqa tool that caches build object-files etc locally on the disc and can speed up build time significantly in subsequent builds. On Debian-based systems (Ubuntu, Mint etc) you simply install it by running:

$ sudo apt-get install ccache

The makefiles in build.git are configured to automatically find and use ccache if ccache is installed on your system, so other than having it installed you don't have to think about anything.

8. FAQ

Please have a look at out FAQ file for a list of questions commonly asked.