Public bug reported:

Impact
======

Updated firmware is required to support booting the Raspberry Pi 4,
primarily by providing Pi 4 specific variants of start*.elf and
fixup*.dat.

The updated package has been built in the following PPA:
https://launchpad.net/~waveform/+archive/ubuntu/ubpi4/+packages


Test Case
=========

* Flash a current eoan daily image to an SD card
* Verify the card doesn't boot on a Pi4
* Boot the card on a Pi3/3+
* Upgrade the u-boot-rpi and linux-firmware-raspi2 packages from the PPA
* Boot the card on a Pi4


Regression Potential
====================

The proposed package is being tested on all supported Pi variants (2, 3,
3+, CM3, CM3+, and 4) with all supported archs (armhf done, arm64
underway) with no failures thus far. Only the Pi uses this package so,
unlike with the u-boot upgrade, no other platforms can be affected.

Beyond the firmware version bump, I did take the opportunity to clean up
some mistakes in the postinst, primarily removing the incorrect device-
tree address hack. The boot config isn't under the control of this
package, which shouldn't be fiddling with it, especially when the
device-tree address it's using is different to that used in our boot
scripts. However, given the base image includes device_tree_address in
its configs, that part of the postinst was effectively redundant anyway
(unless users modified their config.txt, but if they do they almost
certainly don't want a package to arbitrarily mess with their changes).

** Affects: linux-firmware-raspi2 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1847163

Title:
  [FFe] Firmware bump for Pi 4 boot support

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