[Bug 1936370] Re: u-boot-sifive does not upgrade u-boot on disk

[Dimitri John Ledkov]

NB! postinst must be executable

** Patch added: "impish.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/u-boot/+bug/1936370/+attachment/5511152/+files/impish.debdiff

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https://bugs.launchpad.net/bugs/1936370

Title:
  u-boot-sifive does not upgrade u-boot on disk

Status in u-boot package in Ubuntu:
  New
Status in u-boot source package in Focal:
  New
Status in u-boot source package in Hirsute:
  New
Status in u-boot source package in Impish:
  New

Bug description:
  [Impact]

   * u-boot-sifive package currently does not upgrade bootloader on loader1/loader2 partitions.
   
   * there have now been bugs identified, meaning that upgrading u-boot is required to upgrade from v5.8 kernel to v5.11 (i.e. either in-focal, or from focal to hirsute).

   * Add maintainer script that identifies if the machine one is running
  on is unleashed or unamtched, and appropriately upgrades the
  bootloader on loader1/loader2 partitions.

  [Test Plan]

   * Boot older unleashed or unmatched image

   * Upgrade u-boot-sifive to latest package

   * Reboot, and observe on the serial console that u-boot version
  number is incremented to the latest one.

   * Repeat the test twice, once with unleashed board, once with
  unmatched board

   * Upgrade the package under qemu VM and observe no side-effects / no
  attempts to upgrade anything.

  [Where problems could occur]

   * It is not possible to atomically upgrade loader1 and loader2 simultaniously.
   * A backup of loader1 and loader2 partitions is not stored anywhere.
   * Thus in case of errors rollback of older u-boot is not performed.
   * However if dd of one or the other partition fails, it is unlikely that one can restore the backup.

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