Move grub files from /EFI/BOOT/ to /boot/grub/ on ISO 9660

Move the location of GRUB files so that there is boot-platform
(BIOS vs EFI) neutral place for GRUB-specific files (e.g. configuration
files, background images, etc.).

The EFI binaries are obviosly staying in the default/fallback boot path
`/EFI/BOOT/BOOT*.EFI`, otherwise there will be no UEFI booting.

The /boot/grub/ directory will be used to store BIOS (i386-pc) GRUB
bootsector images, if we get to that.

It is also a requirement for implementing `loopback.cfg` support, since
the file's path must be `/boot/grub/loopback.cfg`.

Implements #206

1 files changed, 2 insertions, 0 deletions

diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index e00ebcb..da1c9ea 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -22,6 +22,8 @@ Changed
 - Honor ``SOURCE_DATE_EPOCH`` in the ``date`` command used by ``profiledef.sh`` of the shipped profiles.
 - Do not duplicate ``grub.cfg`` in both ISO 9660 and the EFI system partition / El Torito image. GRUB will search for
   the ISO volume and load the ``grub.cfg`` from there.
+- Moved GRUB files on ISO 9660 from ``/EFI/BOOT/`` to a boot-platform neutral place ``/boot/grub/``. This does not apply
+  to the EFI binaries that remain in the default/fallback boot path.
 
 Removed
 -------