[Bug 2069802] Re: [SRU] flash-kernel to support xilinx kria platforms with noble kernel

[Dave Jones]

Some quick clarifications to Loic's excellent notes:

> ... it should probably also run when f-k gets updated but I think it
doesn't right now ...

It should indeed be running when f-k is updated. That's something I
fixed a while ago (LP: #1667742), and then fixed the fix (LP: #2007827).
As you noted, it's complex :)

> ... I haven't looked at how the two would get sorted; would the
highest version win, or would the name be preponderant?

This depends on the implementation of "linux-version sort", which it
turns out is just doing Debian version comparison on the kernel version
*including the suffix*. So if two versions are otherwise identical the
suffix which sorts alphabetically later will be "latest". For example:

  $ cat versions
  6.8.0-1005-raspi
  6.8.0-1005-generic
  $ linux-version sort < versions
  6.8.0-1005-generic
  6.8.0-1005-raspi

Worth bearing in mind when "moving flavours".

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https://bugs.launchpad.net/bugs/2069802

Title:
  [SRU] flash-kernel to support xilinx kria platforms with noble kernel

Status in flash-kernel package in Ubuntu:
  In Progress

Bug description:
  [ Impact ]

   * With the current version of flash-kernel, users wont be able to
  boot into xilinx devices using optimised noble kernel because of the
  renaming of device-trees in kernel and cma configuration changes.

   * We need to fix this issue to keep support for xilinx devices in
  noble as well. This must not be back-ported into jammy since the
  kernel in jammy keeps the old names for device-trees and cma
  configuration in there didn't change

   * Patch will fix the issue by updating bootscript and `its` file to
  point correct device-tree files.

  [ Test Plan ]

   * Flash the new image generated with new flash-kernel that has this fix
   * Try booting with new image
   * You should be able to reach the login prompt and be able to login using default username and password
   * This must work for all Kria devices listed below:
    - KV260
    - KR260
    - KD240

  [ Where problems could occur ]
   * This change could only impact Xilinx Kria devices since it will only touch the files used by Xilinx Kria platforms including the ones listed above in test plan
   * Since this is an enablement patch for Ubuntu Noble image on Xilinx Kria platforms, there shouldnt be an impact to devices in the field.
   * If the patch is broken then the devices listed above will still continue to not work.

  [ Other Info ]
   
   * This is based on changes in new optimised kernel: https://code.launchpad.net/~canonical-kernel/ubuntu/+source/linux-xilinx/+git/noble

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