Nerves 1.5, Octavo OSD3358-SM-RED (BBB variant), eth0 not working

Nerves Forum Nerves Questions / Help
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I am new to Nerves/Elixir and have inherited a Nerves project running on the Beaglebone Black. I have been tasked with bringing up our software, including Nerves, on the Octavo OSD3358-SM-RED eval board which is an SoC variant of the BBB.

I have built the nerves_examples/hello_network example and burned it to a SD card; when booted on a true BBB eth0 comes up and works as expected (gets DHCP addr, is pingable); when booted on the Octavo board eth0 does not work. I found, and worked around, an issue where the Octavo’s EEPROM incorrectly identifies the board - but fixing this did not help eth0. I have also tried setting a static IP via Nerves console commands but this does not help.

The Octavo board has a version of Debian Linux on its EMMC that is able to correctly bring up eth0; I noticed that this Linux uses kernel version 4.9.45-ti-r57 and tried in vain to get a local copy of the nerves_system_bbb repo to build with 4.9.45-ti-r57 (patching errors). I was successful at getting nerves_system_bbb built with a kernel later than the “default” version of the 4.19.50 kernel but this did not help either.

Wondering if anybody has a specific experience or can offer some advice?
Thanks!
Greg

I followed the Nerves install/getting started tutorial (MacOS) and am using the following:
Erlang/OTP 22 [erts-10.4.4] [source] [64-bit] [smp:6:6] [ds:6:6:10] [async-threads:1] [hipe]
Elixir 1.9.1 (compiled with Erlang/OTP 22)

Mix.exs

defmodule HelloNetwork.MixProject do
  use Mix.Project

  @app :hello_network
  @version "0.1.0"
  @all_targets [:rpi, :rpi0, :rpi2, :rpi3, :rpi3a, :rpi4, :bbb, :x86_64]

  def project do
    [
      app: @app,
      version: @version,
      elixir: "~> 1.9",
      archives: [nerves_bootstrap: "~> 1.6"],
      start_permanent: Mix.env() == :prod,
      build_embedded: true,
      aliases: [loadconfig: [&bootstrap/1]],
      deps: deps(),
      releases: [{@app, release()}],
      preferred_cli_target: [run: :host, test: :host]
    ]
  end

  # Starting nerves_bootstrap adds the required aliases to Mix.Project.config()
  # Aliases are only added if MIX_TARGET is set.
  def bootstrap(args) do
    Application.start(:nerves_bootstrap)
    Mix.Task.run("loadconfig", args)
  end

  # Run "mix help compile.app" to learn about applications.
  def application do
    [
      mod: {HelloNetwork, []},
      extra_applications: [:logger, :runtime_tools]
    ]
  end

  # Run "mix help deps" to learn about dependencies.
  defp deps do
    [
      # Dependencies for all targets
      {:nerves, "~> 1.5.0", runtime: false},
      {:shoehorn, "~> 0.6"},
      {:ring_logger, "~> 0.6"},
      {:toolshed, "~> 0.2"},

      # Dependencies for all targets except :host
      {:nerves_runtime, "~> 0.6", targets: @all_targets},
      {:nerves_init_gadget, "~> 0.4", targets: @all_targets},

      # Dependencies for specific targets
      #{:nerves_system_bbb, "~> 2.3", runtime: false, targets: :bbb},
      #{:nerves_system_bbb, "~> 2.4.0", nerves: [compile: true], targets: :bbb},
      #{:nerves_system_bbb, path: "../../nerves_system_bbb", runtime: false, targets: :bbb},
      {:nerves_system_bbb, path: "../../nerves_system_bbb", nerves: [compile: true], targets: :bbb},
      {:nerves_system_x86_64, "~> 1.8", runtime: false, targets: :x86_64},
    ]
  end

  def release do
    [
      overwrite: true,
      cookie: "#{@app}_cookie",
      include_erts: &Nerves.Release.erts/0,
      steps: [&Nerves.Release.init/1, :assemble],
      strip_beams: Mix.env() == :prod
    ]
  end
end