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[Launchpad Bug Tracker <1900774@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package grub2 - 2.04-1ubuntu26.7

---------------
grub2 (2.04-1ubuntu26.7) focal; urgency=medium

  * Avoid "EFI stub: FIRMWARE BUG" message when booting >= 5.7 kernels
    on arm64 by setting the image base address before jumping to the
    PE/COFF entry point LP: #1900774
  * Fix tftp timeouts when fetching large files. LP: #1900773

 -- dann frazier <dannf@xxxxxxxxxx>  Thu, 12 Nov 2020 16:15:13 -0700

** Changed in: grub2 (Ubuntu Focal)
       Status: Fix Committed => Fix Released

** Changed in: grub2 (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1900774

Title:
  [arm64] EFI stub: ERROR: FIRMWARE BUG: efi_loaded_image_t::image_base
  has bogus value

Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2 source package in Xenial:
  Fix Committed
Status in grub2 source package in Bionic:
  Fix Released
Status in grub2 source package in Focal:
  Fix Released
Status in grub2 source package in Groovy:
  Fix Released
Status in grub2 source package in Hirsute:
  Fix Released

Bug description:
  [Impact]
  When booting a kernel >= 5.7 via GRUB on an arm64 server, the EFI stub falsely reports a firmware bug:

  EFI stub: Booting Linux Kernel...
  EFI stub: EFI_RNG_PROTOCOL unavailable, no randomness supplied
  EFI stub: ERROR: FIRMWARE BUG: efi_loaded_image_t::image_base has bogus value
  EFI stub: Using DTB from configuration table
  EFI stub: Exiting boot services and installing virtual address map...
  [    0.000000] Booting Linux on physical CPU 0x0000000000 [0x431f0a10]

  [Test Case]
  Boot the arm64 groovy kernel, or any other kernel >= 5.7.
  Regression test on an EFI based x86 system (e.g. lxc --vm)

  [Fix]
  https://github.com/rhboot/grub2/commit/1d5ef08216edec4d31d0e10cfdb30b5ebfef7a45

  [Where Problems Could Occur]
  The fix is in GRUB's EFI loader, so problems would likely appear early in the boot of the kernel (during EFI stub processing).

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