With the eglibc image you can connect through Ethernet using connman. First, start and enable connman using:
systemctl start connman systemctl enable connman
Now, with the Ethernet cable connected run the command connmanctl services, you should see the Ethernet option as AO Wired Ethernet and a number.
You can connect to this interface using connmanctl connect ethernet_########_cable.
Additionally you can configure the IP address of the interface with:
connmanctl config <service> --ipv4 manual <ip address> <netmask> <gateway>. The <> brackets are not needed.
More information of different connman settings in https://wiki.archlinux.org/index.php/Connman