Enable riscv64 build

Bug #1876620 reported by Ryan Finnie
This bug affects 1 person
Affects Status Importance Assigned to Milestone
grub2 (Ubuntu)
Heinrich Schuchardt

Bug Description

RISC-V EFI support is not yet in the Linux kernel (ca. 5.8: https://lkml.org/lkml/2020/4/20/1800), and while GRUB2 EFI Loader support needs to happen with the kernel (https://lists.gnu.org/archive/html/grub-devel/2020-04/msg00203.html), GRUB2 already has RISC-V EFI support. It can't currently boot anything, but it is a valid UEFI application and displays a pretty menu.

Please see the attached debdiff. Of note:

* grub2 requires efibootmgr and efivar. I've filed Debian bugs to enable riscv64 for them (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=959498 and https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=959499 respectively), but if this is actioned before those end up happening, it's a simple Architecture: update on each.

* riscv-default-platform.patch: Upstreamed, allows `grub-install` to work without --platform.

* riscv-relocation-offset.patch: Upstreamed, fixes "unaligned pointer" failure.

* riscv-ubuntu-linuxefi.patch: Patches ubuntu-linuxefi.patch for riscv support; not sure if this should be integrated into ubuntu-linuxefi.patch.

* Tested on qemu-system-riscv64 focal.

Revision history for this message
Ryan Finnie (fo0bar) wrote :
description: updated
description: updated
Revision history for this message
Ubuntu Foundations Team Bug Bot (crichton) wrote :

The attachment "grub2-riscv64.debdiff" seems to be a debdiff. The ubuntu-sponsors team has been subscribed to the bug report so that they can review and hopefully sponsor the debdiff. If the attachment isn't a patch, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are member of the ~ubuntu-sponsors, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issue please contact him.]

tags: added: patch
Mathew Hodson (mhodson)
Changed in grub2 (Ubuntu):
importance: Undecided → Wishlist
Revision history for this message
Dimitri John Ledkov (xnox) wrote :

Given there is no secureboot support with lockdown for the platform as far as I know, it is premature to sign the grub2 for riscv64.

Also I think we'd want these patches from upstream. By taking 2.06 or like master for the riscv64 build.

Revision history for this message
Heinrich Schuchardt (xypron) wrote :

To enable RISC-V you need GRUB 2.06 plus this series:

[PATCH v2 0/7] Add LoadFile2 and riscv Linux loader

tags: added: riscv64
removed: patch
tags: added: fr-1681
Revision history for this message
Julian Andres Klode (juliank) wrote :

There is nothing to sponsor here; RISC-V support will land with 2.06

Changed in grub2 (Ubuntu):
assignee: nobody → Heinrich Schuchardt (xypron)
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