[Bug 1847587] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for flash-kernel has
completed successfully and the package is now being released to
-updates.  Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1847587

Title:
  [SRU] Add entries for Pi 4

Status in flash-kernel package in Ubuntu:
  Fix Released
Status in flash-kernel source package in Bionic:
  Fix Released

Bug description:
  Impact
  ======

  The current stable release (bionic) does not support booting on the
  Raspberry Pi 4. Several packages need back-porting from devel to
  support this, along with a new kernel.

  Bionic back-port branch:

  https://code.launchpad.net/~waveform/ubuntu/+source/flash-kernel/+git
  /flash-kernel/+ref/bionic-clean-up

  Focal branch:

  https://code.launchpad.net/~waveform/ubuntu/+source/flash-kernel/+git
  /flash-kernel/+ref/focal-clean-up

  Builds of packages for both releases available from the following PPA
  (along with all packages required for testing the bionic back-port):

  https://launchpad.net/~waveform/+archive/ubuntu/pi4

  Test Case
  =========

  * Attempt to boot the latest bionic image (18.04.3) on a pi4; note failure
  * Move the SD card to a pi3 and boot successfully
  * Ensure all packages are up to date (apt update/upgrade)
  * sudo add-apt-repository ppa:waveform/pi4
  * sudo apt upgrade
  * sudo reboot
  * Ensure boot proceeds successfully on the pi3
  * Verify facilities (USB peripherals, USB mass storage, wifi, bluetooth, audio, etc.) work
  * sudo apt install linux-image-raspi2-hwe-18.04-edge
  * sudo reboot
  * Ensure boot proceeds successfully on the pi3
  * Verify facilities (USB peripherals, USB mass storage, wifi, bluetooth, audio, etc.) work
  * Move the SD card back to the pi4
  * Ensure boot proceeds successfully on the pi4
  * Verify facilities (USB peripherals, USB mass storage, wifi, bluetooth, audio, etc.) work
  * Repeat for both archs (armhf and arm64)

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

  Plenty; pi4 support on bionic requires back-ports of flash-kernel,
  u-boot, linux-firmware-raspi2, and the kernel. Furthermore, the
  firmware package needs to support two kernels (the current 4.x series
  and the proposed 5.x series). Verification of boot, and other
  facilities (USB peripherals, mass storage, free memory, wifi, etc.
  etc.) should be performed on both archs and all supported models of pi
  (2, 3, 3A+, 3B+, 4B all memory variants).

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