[Bug 1899612] [NEW] linux arm64 efi patches, broke non-sb armhf boot

[Dimitri John Ledkov]

Public bug reported:

linux arm64 efi patches, broke non-sb armhf boot

armhf efi boot uses arm64 efi linux boot.

Unfortunately, it has to perform the previous way of booting to ensure
that firmware is calling start_image on the kernel; as otherwise grub
cannot jump to kernel to execute it from T32->A32 mode.

Thus probably the latest linux-arm64-efi patch, needs to be reworked to
be conditional on arm64 only.

What currently happens is this:

Prefetch Abort Exception PC at 0xB15BB002  CPSR 0x600F0113 
Prefetch Abort Exception PC at 0xB15BB002  CPSR 0x600F0113 

Rebuilding just some arm64 loader functions as A32 with gcc function attribute does not help.
Rebuilding all of grub as A32, results in OVMF failing to start it.
Maybe rebuilding OVMF & grub & kernel all as A32 might work (still a todo).

I feel like maybe going back to original code path for armhf efi might
be best.

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1899612

Title:
  linux arm64 efi patches, broke non-sb armhf boot

Status in grub2 package in Ubuntu:
  New

Bug description:
  linux arm64 efi patches, broke non-sb armhf boot

  armhf efi boot uses arm64 efi linux boot.

  Unfortunately, it has to perform the previous way of booting to ensure
  that firmware is calling start_image on the kernel; as otherwise grub
  cannot jump to kernel to execute it from T32->A32 mode.

  Thus probably the latest linux-arm64-efi patch, needs to be reworked
  to be conditional on arm64 only.

  What currently happens is this:

  Prefetch Abort Exception PC at 0xB15BB002  CPSR 0x600F0113 
  Prefetch Abort Exception PC at 0xB15BB002  CPSR 0x600F0113 

  Rebuilding just some arm64 loader functions as A32 with gcc function attribute does not help.
  Rebuilding all of grub as A32, results in OVMF failing to start it.
  Maybe rebuilding OVMF & grub & kernel all as A32 might work (still a todo).

  I feel like maybe going back to original code path for armhf efi might
  be best.

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