[Bug 2038087] Re: [FFe] flash-kernel displays wrong "selected" DTB on various Pi models

[Dave Jones]

@juergh That would be the "proper" way to fix this, but the last time I
tried that it broke several other places in flash-kernel. It might be
easier now, but I don't fancy that invasive a change in an FFe. I ought
to look into it for the next cycle, though (really I ought to look into
completely overhauling the rather hacky "pi" method and stop it spewing
pages of output into the terminal every time it runs, and speed it up
further for that matter).

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Title:
  [FFe] flash-kernel displays wrong "selected" DTB on various Pi models

Status in flash-kernel package in Ubuntu:
  Triaged

Bug description:
  [ Impact ]

  flash-kernel displays a "selected" DTB at the top of its output. On a
  Pi this isn't actually that relevant as it goes on to copy every DTB
  associated with the kernel anyway, but this is still confusing for
  users, especially when they see a completely different board model
  than the one they expected (e.g. at present on the Pi 400 or Pi 5, the
  output will indicate that the rpi-4-b dtb is being used).

  [ Test Plan ]

  * Boot a mantic daily image on an affected model of Pi (400, 5, CM3, CM3+, Zero 2W)
  * Run "sudo flash-kernel" and confirm it outputs "Using DTB: bcm2711-rpi-4-b.dtb" at the top of its messages
  * Enable the -proposed pocket and "sudo apt update"
  * "sudo apt install flash-kernel" to update flash-kernel to the proposed version
  * Run "sudo flash-kernel" and confirm it outputs the correct DTB for the selected model of Pi.

  [ Regression Potential ]

  Low; the existing flash-kernel already copies all DTBs found and the
  proposed one will too (all Pi related entries use "Method: pi", the
  method isn't changing in its behaviour, the only db entries that are
  changing are Pi related). Thus the worst-case scenario is that flash-
  kernel continues to output the "wrong" DTB at the top of its output,
  which is no worse than the present situation.

  [ Original Description ]
  flash-kernel probably shouldn't even be dealing with the DTBs on Pi but it's picking the wrong one for some machine models. For example on a Raspberry Pi 400 Rev 1.0 it uses bcm2711-rpi-4-b.dtb. Same one Compute Module 3 and 3+.

  It's probably because in /usr/share/flash-kernel/db/all.db the catch-
  all

  Machine: Raspberry Pi *

  is listed before these above mentioned models (and others as well).

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