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I found where was my issue. After using different GRUBX64.efi and
BOOTX64.efi binaries (this time from
https://vault.centos.org/8.3.2011/BaseOS/x86_64/kickstart/EFI/BOOT/
instead from Ubuntu Bionic LiveCD) everything worked normally and the
large initrd was successfully loaded.  It seems that used EFI binaries
from Ubuntu had that issue.

Advice in such case is: check with another bootloader variant/version
if the problem persists.

 Thanks!

-Vuk


On Mon, May 17, 2021 at 4:14 PM Dmitry Tantsur <dtantsur at redhat.com> wrote:
>
> Hi,
>
> I'm not sure. We have never hit this problem with DIB-built images before. I know that TripleO uses an even larger image than one we publish on tarballs.o.o.