EBC Exercise 05 Getting Exercise Support Materials
Embedded Linux Class by Mark A. Yoder
You need to download some reference manuals and set up your Beagle with some extra files. Here's what to do.
Download Reference Manuals
There are two important hardware reference manuals you need to have, the System Reference Manual (SRM) and the Technical Reference Manual (TRM) for the ARM processor. Here's where to find them.
- CircuitCo has the official reference materials for the Bone. Click on the link for the Bone Black and then click on the Hardware Files link. Here you will find a link to a pdf file with the SRM. Download it.
- Finding the TRM is a bit trickier. Open the SRM you found in the previous step and find what processor it is using. (Hint: page 52) You'll find a link to a TI site that has the manual. Be sure you have the right one, it's some 18M and 4,100+ pages long.
Keep both of these in an easy to find place, we'll reference them now and then.
Set Up Git
Many of the following exercises require some extra files on the BeagleBoard. These files are stored in a git repository. We'll learn more about using git later. Here I'll just show you how to get the files.
I suggest you do this for both your host computer and your Beagle. On the Beagle use
beagle$ opkg update beagle$ opkg install git beagle$ opkg install openssh-keygen
The last opkg installs
ssh-keygen which is needed to work with github. If
opkg can't find it try:
beagle$ wget http://www.rose-hulman.edu/~yoder/Beagle/ssh-keygen beagle$ chmod +x ssh-keygen
On my host computer I had to run
host$ apt-get install git host$ ssh-add id_rsa
Now go to github and generating-ssh-keys and follow the directions for installing and setting up git using the ssh-keys method. Note: The versions of git installed by opkg (1.7.7) and apt-get (188.8.131.52) aren't new enough to use the credential helper so (you need git 1.7.10 or newer) so you need to use the 2nd link above and use the ssh-keys method.
No need to set up your own repository right now (unless you want to).
Once you've followed the instructions on github check your setup with
beagle$ ssh -T firstname.lastname@example.org Warning: untrusted X11 forwarding setup failed: xauth key data not generated Warning: No xauth data; using fake authentication data for X11 forwarding. X11 forwarding request failed on channel 0 Hi MarkAYoder! You've successfully authenticated, but GitHub does not provide shell access.
Now you are ready to use github.
Get the Files
It only takes one command to pull down all the files.
beagle$ git clone git://github.com/MarkAYoder/BeagleBoard-exercises.git exercises
This will take a while since it's getting all the course files, including pdf files of the course PowerPoint. You only have to clone once for each computer. I suggest you do the same on your host computer.
host$ git clone git://github.com/MarkAYoder/BeagleBoard-exercises.git exercises
Now take a look at what you got.
beagle$ cd exercises beagle$ ls beagle$ cd pptx beagle$ ls
Later exercises will tell you which files to use from here.
If it's been a while since you did the clone it's a good idea to do a pull. This will make sure all the files are up to date.
beagle$ git pull
P8 and P9 Header Files
The BeagleBone Black has two headers, P8 and P9, that have lots of IO. There are two pdf files that have lots of information about the headers in this git repository. Here's how to get them
host$ git clone git://github.com/derekmolloy/boneDeviceTree.git host$ cd boneDeviceTree/docs host$ ls BeagleboneBlackP8HeaderTable.pdf BeagleboneBlackP9HeaderTable.pdf
Put these where you can find them again.
Materials for later
Some later exercises will need the following additional git repositories. You don't have to load them now, the exercises will tell you when to do it.
This will load Big Buck Bunny and some other media.
beagle$ cd ~/exercises/gstreamer beagle$ git clone git://github.com/MarkAYoder/esc-media.git
This load the things needed for using the DSP.
beagle$ cd ~/exercises/audioThru/lab06d_audio_c6run beagle$ git clone git://github.com/MarkAYoder/c6run_build.git
Embedded Linux Class by Mark A. Yoder