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

[Heinrich Schuchardt]

Tested livecd-rootfs 2.765.13 on Jammy:

http://cdimage.ubuntu.com/ubuntu-server/jammy/daily-preinstalled/20221129.1/jammy-preinstalled-server-riscv64+licheerv.img.xz built with livecd-rootfs 2.765.13
* boot works
* reboot works
* apt-get update; apt-get install hello; hello works
* snap install hello; hello works

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

Status in livecd-rootfs package in Ubuntu:
  New
Status in livecd-rootfs source package in Jammy:
  Fix Committed

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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