It seems that setup-storage does not handle /boot/efi in any special way. So the easiest way to get the ESP partition into the yml file is to add a hook (or to add it later into FAI) which does something like this:
esppart=$(df --output=source /boot/efi|grep -v Filesystem) echo $esppart >> ..... What do you think about this? Is the ESP partition always mounted on /boot/efi? -- regards Thomas