EBC Exercise 02 Out-of-the-Box, Bone
Embedded Linux Class by Mark A. Yoder
These instructions are for the 3.8 and newer kernels. EBC Exercise 02 Out-of-the-Box, Bone 3.2 Kernel has instructions for the 3.2 kernel.
We'll be running the 3.8 kernel, check out these instructions for getting started. Then come back here to get your network set up.
One of the slickest features of the Bone is its ability to access the Internet through the USB (tether) connection. You should have already used it following the instructions above. Below shows how to set up your host and Bone so the bone can access the internet through your host.
host$ ifconfig eth0 Link encap:Ethernet HWaddr 00:18:8b:72:b8:c2 inet addr:126.96.36.199 Bcast:188.8.131.52 Mask:255.255.255.0 inet6 addr: fe80::218:8bff:fe72:b8c2/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:8481193 errors:0 dropped:0 overruns:0 frame:0 TX packets:1871287 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:3172154531 (3.1 GB) TX bytes:203188180 (203.1 MB) Interrupt:19 eth4 Link encap:Ethernet HWaddr d4:94:a1:39:ff:ff inet addr:192.168.7.1 Bcast:192.168.7.3 Mask:255.255.255.252 inet6 addr: fe80::d694:a1ff:fe39:ffff/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:8 errors:0 dropped:0 overruns:0 frame:0 TX packets:6 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:2775 (2.7 KB) TX bytes:1234 (1.2 KB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:37315 errors:0 dropped:0 overruns:0 frame:0 TX packets:37315 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:3665320 (3.6 MB) TX bytes:3665320 (3.6 MB)
You'll see a new network has appeared, eth4 in my case. The IP address of your host is 192.168.7.1. There's a good chance the Bone is at 192.168.7.2. Try connecting to it.
host$ ssh -X firstname.lastname@example.org bone$
You are now logged into the Bone through the network. This is much faster than the serial port (.115M vs. 100M) and supports many interesting network operations. The only problem is, the Beagle doesn't know how to access the Internet through the host. Get back to the host computer:
Set Up Git
We need to run some files that are in the class git repository. We'll learn more about using git later. Here I'll just show you how to get the files. Here we are installing these files on your host computer, later we'll install them on your Beagle.
On my host computer I had to run
host$ apt-get install git
Get the Files
It only takes one command to pull down all the files.
host$ git clone https://github.com/MarkAYoder/BeagleBoard-exercises.git exercises --depth=1
(The whole repo is some 550M. Using --depth=1 you only get the recent history and it only takes 190M.)
This will take a while since it's getting all the course files, including pdf files of the course PowerPoint.
Now that the files are installed, run:
host$ cd exercises/setup host$ ./ipMasquerade.sh eth0
This will give you instructions on how to set up your host. Note: If you are using a wireless connection you should use
host$ ./ipMasquerade.sh wlan0
Once ./ipMasquerade.sh has been run you can:
Now you should have network access on the Bone.
bone$ ping -c2 google.com
You should see Google responding.
Congratulations! Your Beagle is now on the network through your host computer.
If you get an unknown host response when attempting to ping google.com, and you are off campus, try pinging the Google DNS by IP address. Run:
bone$ ping 184.108.40.206
If you are on campus, run:
bone$ ping 220.127.116.11
If you now see responses by pinging a specific IP, it is possible that a firewall on your host computer is blocking the Beagle's access to the DNS when attempting to ping by domain name. On Ubuntu/Mint, run:
host$ sudo ufw disable Firewall stopped and disabled on system startup
You should get a response, such as above, that the firewall will be disabled upon next startup. After saving anything important, restart your host through the start menu or run:
Repeat this exercise and attempt to ping Google by domain name again. If you now receive responses, then the firewall was indeed the issue. Otherwise, the internet is your friend. Use your host computer to try and find a solution. Feel free to add solutions here when you find them
I haven't checked these instructions this year. Please report your results and update if needed.
- go to System Preferences and select Network
- You should see RNDIS/...Gadget. This is the network connection to the Beagle. Select it
- Wait for the IP address 192.168.7.1 to appear
- Click Show All and select Sharing
- Select Internet Sharing
- Select RNDIS/Ethernet Gadget
In a terminal window connect to the serial port
host$ screen /dev/ttyusb*B 115200 bone$ udhcpc -i usb0 bone$ ping google.com
This is all nicely shown here in this silent YouTube movie.
Congratulations, you now have a connection from your BeagleBone to the Internet.
I haven't checked these either. Please report results and update if needed.
There are several ways of running ssh on Windows 7. Below are a couple of tools that you can use.
You can either run ssh from a bash terminal (i.e. C:\Program Files\Git\Git Bash or C:\cygwin\Cygwin.bat), or you can add the bin directories to your path and run from the Windows command prompt (i.e. add C:\Program Files\Git\bin or C:\cygwin\bin to your path).
Note: Be careful adding multiple bin directories to your path
First time setup
- Run regedit
- Navigate to Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Tcpip\Parameters
- Change IPEnableRouter from 0 to 1
- Close regedit
- Run services
- Make sure the following are set to Automatic and are started
- Routing and Remote Access
- Internet Connection Sharing (ICS)
Connecting to the Internet
- Navigate to Control Panel\Network and Internet\Network and Sharing Center\Change adapter settings
- Right click your wired/wireless internet connection and go to Properties
- Go to the Sharing tab
- Check the box to Allow other network users to connect through this computer's Internet connection
- Select your bone's local area connection for the Home networking connection (if you cannot choose the local area connection, turn your internet connection sharing off and then back on)
- Return to Change adapter settings
- Right click your Bone's internet connection and go to Properties
- Select Internet Protocol Version 4 (TCP/IPv4) and choose Properties
- Choose Obtain an IP address automatically and Obtain DNS server address automatically
Open a command prompt or bash terminal and run the following:
host$ ping 192.168.7.2
If this ping times out then disable and re-enable your bone's local area connection and try again. Once it works run the following:
host$ ssh email@example.com
Login as root and run the following:
bone$ echo "nameserver 18.104.22.168" > /etc/resolv.conf bone$ echo "nameserver 22.214.171.124" >> /etc/resolv.conf bone$ /sbin/route add default gw 192.168.7.1 bone$ ping google.com
If 'ping:unknown host google.com' occurs, run this instead:
bone$ echo "nameserver 126.96.36.199" > /etc/resolv.conf bone$ /sbin/route add default gw 192.168.7.1 bone$ ping google.com
Congratulations, you now have a connection from your BeagleBone through your Linux host to the Internet.
Embedded Linux Class by Mark A. Yoder