Create a link /boot -> /<efi>/boot, where <efi> is the mountpoint
of the EFI file system. This makes the EFI partition non-optional.
I don't think that the links are actually correct, given that all
the mount points are under /mnt when sysinstall is run as init.
(ie a non-upgrade). Thus: I think I need to go in once more, but
at least this doesn't get lost...