[Bug 1997233] [NEW] Support LicheeRV and PolarFire RISC-V platforms in jammy

[Łukasz Zemczak]

Public bug reported:

[Impact]

As part of our HWE story, we want to support two new platforms
(available in kinetic/lunar): the LicheeRV and the PolarFire Icicle Kit.
To do this, we need to backport some of the livecd-rootfs changes for
building those images.

https://code.launchpad.net/~xypron/livecd-rootfs/+git/livecd-
rootfs/+merge/433185 list all the changes needed:

* Add support for the LicheeRV board (SUBARCH=licheerv)
* Add support for the PolarFire Icicle Kit board (SUBARCH=icicle)
* Reduce initrd size for Nezha and LicheeRV boards
* Use efi=debug earlycon on kernel command line

[Test Case]

Build official PROPOSED=1 images for jammy for licheerv and icicle
SUBARCHes.

Additionally to this, make sure existing RISC-V preinstalled images
still build correctly. Reach out to the CPC to check if cloud images for
RISC-V still build correctly with the new livecd-rootfs.

[Regression Potential]

The only regression potential is breaking other RISC-V related images,
but this should be mitigated by the additional testing steps provided in
the Test Case.

** Affects: livecd-rootfs (Ubuntu)
     Importance: High
         Status: New

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https://bugs.launchpad.net/bugs/1997233

Title:
  Support LicheeRV and PolarFire RISC-V platforms in jammy

Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  [Impact]

  As part of our HWE story, we want to support two new platforms
  (available in kinetic/lunar): the LicheeRV and the PolarFire Icicle
  Kit. To do this, we need to backport some of the livecd-rootfs changes
  for building those images.

  https://code.launchpad.net/~xypron/livecd-rootfs/+git/livecd-
  rootfs/+merge/433185 list all the changes needed:

  * Add support for the LicheeRV board (SUBARCH=licheerv)
  * Add support for the PolarFire Icicle Kit board (SUBARCH=icicle)
  * Reduce initrd size for Nezha and LicheeRV boards
  * Use efi=debug earlycon on kernel command line

  [Test Case]

  Build official PROPOSED=1 images for jammy for licheerv and icicle
  SUBARCHes.

  Additionally to this, make sure existing RISC-V preinstalled images
  still build correctly. Reach out to the CPC to check if cloud images
  for RISC-V still build correctly with the new livecd-rootfs.

  [Regression Potential]

  The only regression potential is breaking other RISC-V related images,
  but this should be mitigated by the additional testing steps provided
  in the Test Case.

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