[Bug 1905274] Re: enable u-boot spl for riscv64

[Dimitri John Ledkov]

** Changed in: u-boot (Ubuntu Focal)
    Milestone: ubuntu-20.04.1 => ubuntu-20.04.2

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Title:
  enable u-boot spl for riscv64

Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in u-boot package in Ubuntu:
  Fix Released
Status in u-boot source package in Focal:
  Fix Committed
Status in livecd-rootfs source package in Groovy:
  Won't Fix
Status in u-boot source package in Groovy:
  Fix Committed

Bug description:
  [Impact]

   * To build bootable uboot-sifive package, it must be built with
  opensbi. Currently those are missbuilt and not packaged.

  [Test Case]

   * Download u-boot buildlog for riscv64

  and Look for:

  /<<PKGBUILDDIR>>/"arch/riscv/lib/mkimage_fit_opensbi.sh" \
  arch/riscv/dts/hifive-unleashed-a00.dtb > u-boot.its
  WARNING: OpenSBI binary "fw_dynamic.bin" not found, resulting binary is not functional.

  * A missbuilt package will have the Warning emitted by
  mkimage_fit_opensbi.sh, whereas fixed u-boot package will not.

  * Check that uboot-sifive riscv64 .deb provides

  ./usr/lib/u-boot/sifive_fu540/u-boot-spl.bin
  ./usr/lib/u-boot/sifive_fu540/u-boot.bin
  ./usr/lib/u-boot/sifive_fu540/u-boot.itb
  ./usr/lib/u-boot/sifive_fu540/uboot.elf

  As those will be consumed by livecd-rootfs when building bootable
  preinstalled images.

  [Where problems could occur]

   * u-boot build embedds FU540 dtb and OpenSBI at a particular
  interface versions. It is unknown if these components will be
  compatible with future board revisions or may require changes and
  rebuilds. Specifically kernel interfaces with opensbi and uboot and
  hardware and has certain dtb expectation. Currently it has been
  verified that the dtb vendored in opensbi u-boot and kernel are all
  identical. But hardware issues may arise when these will change out of
  sync - for example opensbi installed shutdown/reboot handler resulting
  in a reboot hang.

  I expect all of these components needing changes and rebuilds to
  support FU740.

  [Other Info]

   * Groovy will not receive these changes. There will not be a point
  release of groovy to make a new image. Focal images will be provided
  at next point release which will only be supported to upgrade to
  hirsute or next LTS.

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