[Bug 1854347] 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/1854347

Title:
  Boot hang on Pi3B+ arm64 images with the latest boot.scr

Status in flash-kernel package in Ubuntu:
  Invalid
Status in flash-kernel source package in Eoan:
  Fix Released

Bug description:
  [Impact]

  We still don't know exactly what causes the boot hang to happen on
  this device, but latest eoan arm64 test images hang on the Pi3B+ when
  a regular USB keyboard is attached. As we're continuing to find the
  root cause, for now we decided that we'll be reverting the boot.scr
  changes to not block further work.

  The bug itself might be related to how ubuntu-image populates the boot
  partition. Still, the boot.scr changes were not needed in eoan, so
  it's safe to revert anyway.

  [Test Case]

  Build a test raspi3 image (armhf, arm64), flash various Pi devices and
  make sure they still boot. This change will be extensively tested by
  certification as well.

  [Regression Potential]

  As with any bootscript change, there might be subtle regressions
  regarding boot-ability in various edge scenarios. We will be
  performing extensive testing to make sure it does not regress. Also,
  this boot.scr that we're reverting to was already in use on the eoan
  original images, so it got a lot of testing on its own.

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