[Bug 2116266] Re: Support tryboot's A/B booting on Raspberry Pi

[Dave Jones]

Experimental implementation present in ppa:waveform/flash-kernel. After
a bit more testing, I intend to upload this to questing, then proceed
with adjusting the Raspberry Pi seeds to pull flash-kernel-piboot into
the images.

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Title:
  Support tryboot's A/B booting on Raspberry Pi

Status in flash-kernel package in Ubuntu:
  Triaged

Bug description:
  The Raspberry Pi's tryboot mechanism [1] permits an A/B booting
  structure that permits fallback in the event of bad boot assets (or a
  bad boot configuration). We already substantially patch flash-kernel
  for the Raspberry Pi (to permit moving an image between boards); we
  should adjust the existing "pi" method (or add a new "pi-something"
  method) to write new boot assets to a temporary location from which
  they can be tested with the "tryboot" mechanism.

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