[Bug 2120177] Re: piboot needs to include watchdog in migration

[Dave Jones]

Note to self: this also needs adjusting in the gadget to ensure the
initial configuration in images is correct.

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https://bugs.launchpad.net/bugs/2120177

Title:
  piboot needs to include watchdog in migration

Status in flash-kernel package in Ubuntu:
  Triaged

Bug description:
  The A/B boot mechanism must enable the hardware watchdog in config.txt
  in order for the fallback mechanism to work automatically. This was
  missed in the initial implementation as the initial tests were done
  with a manual power-off, and later with a setup that happened to
  enable the hardware watchdog anyway.

  The migration routine that edits config.txt should append
  dtparam=watchdog=on to the final [all] section in the file. It must be
  added *after* the os_prefix lines (which the migration is already
  adding at the top). If there is no final [all] section, one must be
  added. If dtparam=watchdog=on is already present (in an "[all]"
  section) in the file, we should not duplicate it.

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