[Bug 1904890] 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/1904890

Title:
  [SRU] Please merge flash-kernel 3.103 from Debian unstable

Status in flash-kernel package in Ubuntu:
  New
Status in flash-kernel source package in Focal:
  Fix Released
Status in flash-kernel source package in Groovy:
  Fix Released

Bug description:
  [ Impact ]

  This version includes support for the Pi 400 (which was unavailable at
  Focal's release), and for pattern matching against the machine's model
  in the dtb (e.g. "Raspberry Pi *"). This is necessary for flash-kernel
  to operate successfully on Pi models booted with out of date firmware
  (e.g. older boot firmware marks the Pi 400 as "Raspberry Pi ? Rev
  1.0"). Hence, back-porting this version to Focal is a pre-requisite
  for Pi 400 support.

  [ Test Case ]

  * Flash Ubuntu 20.04 image to an SD card
  * Boot SD card on an older Pi model (e.g. 3B) and run apt update && apt upgrade (this is required as the focal release firmware cannot boot on the 400)
  * Reboot SD card on the Pi 400
  * Attempt flash-kernel; note failure with "unsupported platform"
  * Enable proposed; upgrade flash-kernel to proposed version
  * flash-kernel should run successfully during upgrade (regardless of whether /proc/device-tree/model has "Raspberry Pi 400" or "Raspberry Pi ?", depending on firmware revision)

  [ Regression Potential ]

  Minimal; the diff from 3.100 (groovy current) to 3.103 (sid) is
  minimal (board additions to the database and some new translations),
  whilst the ubuntu changes we're SRUing are already present in groovy
  and have been working happily there since release.

  The diff from 3.98 (focal current) to 3.100 (groovy current) appears
  more substantial but is largely benign. Specifically, a lot of
  definitions in db/all.db are shuffled around as 3.100 imposed an
  alphabetical ordering on the file. Furthermore, two machine
  definitions are dropped (Linksys NSLU2 and Thecus N2100) along with
  their corresponding sub-architectures (ixp4xx and iop32x
  respectively). However, these machines have never been supported in
  Ubuntu (each require an unsupported kernel flavour which only exists
  in Debian).

  [ Original Description ]

  Please merge flash-kernel 3.103 from Debian unstable.

  Updated changelog and diff against Debian unstable to be attached
  shortly.

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