Bug#916695: grub-efi-arm 2.02+dfsg1-9 fails to boot Debian Buster

[Heinrich Schuchardt]

I have reinstalled grub-efi-arm 2.02+dfsg1-9.

With my current U-Boot and a custom built the 4.18.20 kernel I am able
to boot.

The stock Debian kernel does not boot.

What it takes is a U-Boot v2018.11 with these additional patches:

* Revert "efi_loader: remove efi_exit_caches()"
* efi_loader: Ensure memory allocations are page aligned
* lib: crc32: mark static variable as __efi_runtime_data
  (not relevant for Tinker Board)

and a kernel with Ard's patch

43b2ceb0d4e0147b114cb1d0112a988cbb81ecbc
efi/arm: Revert deferred unmap of early memmap mapping

This patch is available since Linux v4.19.6.

Best regards

Heinrich