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Setting up the Network Interface for Yocto

This walks through assigning your LAN9512 an IP address and enabling ssh.

Follow these steps after screen'ing into your Edison from your host Linux machine, as described here (i.e., sudo screen /dev/ttyUSB0 115200).

  1. Create an interfaces file for use with ifup and ifconfig. For a brief description of the ifup command, see here or the man page.

    1. Create the /etc/network directory: mkdir /etc/network.
    2. Create the /etc/network/interfaces file: touch /etc/network/interfaces.

  2. Find the name of the LAN9512 adapter. A very simple way is to use the ifconfig command with the -a flag to show all connected and disconnected interfaces. With the LAN9512 disconnected, run ifconfig -a. Then, connect the adapter and run ifconfig -a again. Note the name of the newly added interface. Mine was enp0s17u1u1.

    • For extra information, use the dmesg tool to view the kernel log and verify that the kernel found the device. You can run dmesg | grep -i network to find when the kernel recognized the network device, and when it gave it a name.

  3. Edit the /etc/network/interfaces file and add the configuration: vi /etc/network/interfaces

    Add the following: (be sure to double check the interface name)

    auto enp0s17u1u1
iface enp0s17u1u1 inet dhcp

  4. Bring the network interface up with ifup and the interface name. Ignore any errors from run-parts about directories not existing.

    Run: ifup enp0s17u1u1 This should tell you something about discovering the network interface and assigning it an IP address (using DHCP).

  5. You can now test that your card is setup properly by running ping xx.xx.xx.xx on the Edison's IP address from your host Linux machine.

  6. You must now either run edison_configure --setup but do not enable wifi. You will be asked to give a root password and name your Edison. If you do not provide a root password, you will have to edit the /lib/systemd/system/sshd.socket file, as shown below:

    Allowing ssh without a root password:

    vi /lib/systemd/system/sshd.socket

    In this file, comment out the line: BindToDevice=usb0 using a #.

    Then reboot by running: reboot.

    (more info here).

  7. You should now be able to ssh into your Edison!

    Bonus: Running edison_configure sets up your Edison to broadcast it's hostname, so instead of ssh'ing into your Edison's IP address, try using <your hostname>.local, e.g., edison.local

    Known Issue: For some reason, the Edison will not switch into USB Host mode except for every other reboot. Try doing a cold restart by unplugging and plugging power back in. (For more info, see here)