[Bug 1805668] Re: Building armhf and arm64 Raspberry Pi 3 images

[CodeExecution]

I don't see the need for separate images for the Pi 2 and 3. I think
that there should only be one image that should work on both the Pi 2
and 3. u-boot works on the Pi 3 if setup with rpi_3_defconfig (for
64-bit) or rpi_3_32b_config (for 32-bit). You can enable BCM2836 support
(if setup with rpi_3_32b_config) and then compile. This results in one
u-boot binary that works on both the Pi 2 and 3).

raspi3-firmware is a script that gets run on every kernel update. It
creates a new config.txt file so that the Pi will boot from the new
kernel and initramfs. The problem is that it overwrites the existing
config.txt instead of just overwriting the kernel and initramfs settings
in config.txt.

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Title:
  Building armhf and arm64 Raspberry Pi 3 images

Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in raspi3-firmware package in Ubuntu:
  Fix Released
Status in u-boot package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Bionic:
  Fix Committed
Status in raspi3-firmware source package in Bionic:
  Fix Committed
Status in u-boot source package in Bionic:
  Fix Committed
Status in livecd-rootfs source package in Cosmic:
  Won't Fix
Status in raspi3-firmware source package in Cosmic:
  Confirmed
Status in u-boot source package in Cosmic:
  Fix Committed

Bug description:
  [Impact]

  One of our long-term goals is to support the same set of platforms for both classical Ubuntu and ubuntu-core. We currently provide official images for the Raspberry Pi 3 for both the core16 and core18 bases but do not provide the same for Ubuntu classic.
  Since it's a 'feature' we're essentially lacking since long, we want to have the new device also supported in our current LTS (bionic).

  [Fix]

  For the classic raspi3 support we will be using the ubuntu-image classic image building tool which is specifically designed for creating preinstalled images. The support for that has already been SRUed in the latest ubuntu-image.
  For the full image build support to be complete, the following list of changes need to be backported (SRUed) into the respective stable series:

   * livecd-rootfs - all the changes regarding classic image build, gadget tree selection and raspi3 rootfs generation.
   * u-boot - bionic will need to be updated to at least 2018.03+dfsg1-2ubuntu2.
   * raspi3-firmware (bionic only) - needs to be updated to at least the version we have in cosmic. Without this change, the console is flooded with firmware error messages every 2 seconds.
   (vorlon) this should be updated specifically to the version of raspi3-firmware that we are using in the gadget snap - currently 1.20180919 - and not to another.

  [Test Case]

   * Run a bionic livefs build of raspi3+armhf with proposed enabled (IMAGEFORMAT=ubuntu-image and PROJECT=ubuntu-cpc), make sure the build succeeds and that the resulting image boots on a raspi3.
   * Run a bionic livefs build of raspi3+arm64 with proposed enabled (IMAGEFORMAT=ubuntu-image and PROJECT=ubuntu-cpc), make sure the build succeeds and that the resulting image boots on a raspi3.
   * Make sure that none of the other bionic daily images fail to build

  [Regression Potential]

  There is some potential that an invalid backport of livecd-rootfs
  functionality could result in the inability to create new ubuntu-core
  images or any of the other existing flavors. But in case of such a
  regression we would see it instantly after the package lands in
  bionic-proposed as we are building daily images with -proposed
  enabled. As for the other packages, there probably is some regression
  potential, but since the versions are backports from disco/cosmic, the
  risk is probably very small.

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