Comment # 9 on bug 921221 from Neil Rickert

Opensuse does have "grub2-i386-efi" in its repos.  That can probably boot
opensuse on your system.  However, it is not part of a standard install, and is
not on the install media.

I don't have an atom based system for experimenting.  There is probably a way
of using the mint grub2-efi to boot the live opensuse USB, and install from
there.  And then use the mint grub2-efi to boot opensuse, until you can get
opensuse's grub2-i386-efi installed and configured.

It might be easier to stick with mint for the present.

There is a openFATE request asking opensuse to add better support for 32-bit
UEFI, but it has not yet been done.  Maybe you can add your vote for that
request.