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

[Dave Jones]

Public bug reported:

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.

** Affects: flash-kernel (Ubuntu)
     Importance: High
     Assignee: Dave Jones (waveform)
         Status: Triaged

** Changed in: flash-kernel (Ubuntu)
     Assignee: (unassigned) => Dave Jones (waveform)

** Changed in: flash-kernel (Ubuntu)
    Milestone: None => ubuntu-25.10

** Changed in: flash-kernel (Ubuntu)
       Status: New => Triaged

** Changed in: flash-kernel (Ubuntu)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/2116266

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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