[Bug 1933093] Re: Drop old UC20 boot args

[Dimitri John Ledkov]

Triggered builds of
https://launchpad.net/~canonical-foundations/+snap/pi-armhf-20/+build/1456832
https://launchpad.net/~canonical-foundations/+snap/pi-arm64-20/+build/1456831

They both currently build with proposed by default, and both have been
built with the new flash-kernel 3.103ubuntu1~20.04.2

The revisions for them are 104 and 105 published in 20/edge channel.

Will wait for tomorrow's daily pi dangerous edge images and will test
boot them over testflinger to verify this sru.

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https://bugs.launchpad.net/bugs/1933093

Title:
  Drop old UC20 boot args

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

Bug description:
  [Impact]

   * During early development of uc20 core-initrd additional kernel
  command-line arguments were required. These were dropped on 20th of
  April 2020 in the pc gadget.

   * They made it into flash-kernel, and were not dropped at the same
  time.

   * They are now redundant and mostly harmless during normal mode of
  operation. However, they get in the way when trying to debug pi
  initrd.

  [Test Plan]

   * Rebuild pi gadget with this update

   * Boot UC20 on pi-armhf or pi-arm64

   * Check that kernel command does not have "systemd.gpt_auto=0
  rd.systemd.unit=basic.target"

  [Where problems could occur]

   * snapd now has new functionality to append or replace kernel command
  line. The remain argument that remains is "panic=-1". I am not too
  sure if the flash-kernel uboot script actually is compatible with the
  snapd's cmdline full / extra functionality.

  [Other Info]

   * Reported at https://github.com/snapcore/core-initrd/pull/28

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