rpi3 to rpi4 project upgrade failure

[jsimmonds2]

Environment

• Elixir version (elixir -v):

Erlang/OTP 22 [erts-10.4.3] [source] [64-bit] [smp:2:2] [ds:2:2:10] [async-threads:1] [hipe]

Elixir 1.9.0 (compiled with Erlang/OTP 22)

• Nerves environment: (mix nerves.env --info)
  |nerves_bootstrap| Environment Package List

  Pkg: nerves_system_br
  Vsn: 1.8.5
  Type: system_platform
  BuildRunner: {nil, []}

  Pkg: nerves_system_rpi4
  Vsn: 1.8.2
  Type: system
  BuildRunner: {Nerves.Artifact.BuildRunners.Local, []}

  Pkg: nerves_toolchain_arm_unknown_linux_gnueabihf
  Vsn: 1.2.0
  Type: toolchain
  BuildRunner: {Nerves.Artifact.BuildRunners.Local, []}

  Pkg: nerves_toolchain_ctng
  Vsn: 1.6.0
  Type: toolchain_platform
  BuildRunner: {nil, []}

|nerves_bootstrap| Loadpaths Start

Nerves environment
MIX_TARGET: rpi4
MIX_ENV: dev

|nerves_bootstrap| Environment Variable List
target: rpi4
toolchain: /home/jhs/.nerves/artifacts/nerves_toolchain_arm_unknown_linux_gnueabihf-linux_x86_64-1.2.0
system: /home/jhs/.nerves/artifacts/nerves_system_rpi4-portable-1.8.2
app: /home/jhs/src/RasPi3BPlus/Blinkers/Nerves/fb2

|nerves_bootstrap| Loadpaths End

• Additional information about your host, target hardware or environment that
  may help

Just taking a simple project that makes working firmware for rpi3 and changing target to rpi4 with this git diff

Current behavior

Include errors, stacktraces, screenshots or code that may help us reproduce the
issue.

Expected behavior

Nice firmware file that I can try out in my shiny new RPi4 :)

[fhunleth]

Is the project overriding the fwup.conf file? The reason I ask is that fixup.dat isn't used on the RPi4. It got renamed to fixup4.dat. There's a similar change with start.elf going to start4.elf. The config.txt and device tree overlay files also changed.

I think it would be useful to compare the fwup.conf file that you have with https://github.com/nerves-project/nerves_system_rpi4/blob/master/fwup.conf. If I remember right, it should a be a bunch of renames and the device tree file.

[jsimmonds2]

Many thanks for the help !
Yes, my little project is indeed overriding fwup.conf . . simply to install the spi1-3cs overlay.
Happy now :)

[jsimmonds2]

( don't know whether comments on Closed Issues reach anyone . . but, for the record, . . )
Thanks to the Nerves core team for providing Raspberry Pi 4 Model B support in Nerves so quickly !

I'm now busy fixing code with silly blind time-delays in initializing an I2C device 😮 because of the extra speed of the RPi4B vs the RPi3B+

[fhunleth]

We get an email, but they're real easy to miss since we're not being reminded by an open issue.

Thanks for letting us know. The RPi4 port took me longer than I was expecting, and it makes me happy that it's working. After ElixirConf US, I hope to start upgrading my Raspberry Pi projects too.