[Bug 2106728] Re: grub-efi-arm64 fails with out of memory error on some hardware

[Mate Kukri]

** Also affects: grub2-unsigned (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: grub2-signed (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: grub2-signed (Ubuntu Plucky)
    Milestone: None => ubuntu-25.04

** Changed in: grub2-unsigned (Ubuntu Plucky)
    Milestone: None => ubuntu-25.04

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https://bugs.launchpad.net/bugs/2106728

Title:
  grub-efi-arm64 fails with out of memory error on some hardware

Status in grub2 package in Ubuntu:
  Confirmed
Status in grub2-signed package in Ubuntu:
  New
Status in grub2-unsigned package in Ubuntu:
  New
Status in grub2 source package in Plucky:
  Confirmed
Status in grub2-signed source package in Plucky:
  New
Status in grub2-unsigned source package in Plucky:
  New

Bug description:
  A patch we added in 2.12-5ubuntu10 to fix LP: #2103864 caused a
  regression that breaks other hardware. There is no guarantee on arm64
  that any memory under 0xffffffff is available so forcing allocations
  below that address breaks affected machines.

  The responsible patch is d/p/arm64-Limit-memory-allocations-
  to-4GB.patch

  A better solution would be to try allocating in the lower 4GB and fall
  back to GRUB_EFI_MAX_USABLE_ADDRESS if that doesn't work.

  Affected hardware includes anything Apple silicon and apparently AMD
  Seattle.

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