If using the agend-based installer installing on s390x LPAR (Classic or DPM) only rootfs, kernel and initrd are provided after 

./openshift-install --dir ./ABI/installer/bin/ agent create image

is being executed.

# ls -lart 

total 1023784 
rw-rr-. 1 root root 974301696 Jun 10 10:40 agent.s390x-rootfs.img 
rw-rr-. 1 root root 9257445 Jun 10 10:40 agent.s390x-kernel.img 
rw-rr-. 1 root root 64774443 Jun 10 10:40 agent.s390x-initrd.img 
drwxr-x---. 2 root root 162 Jun 10 10:40 . 
drwxr-xr-x. 5 root root 4096 Jun 10 10:40 ..    

Get openshift 4.16 installer
Create agent-config.yaml and install-config.yaml (see attached files)
Create the image   

    1.
    2.
    3.
    

    Initrd.addrsize and generic.ins files are missing and only rootfs, kernel and initrd files are present

    # ls -lart 

total 1023784 
rw-rr-. 1 root root 974301696 Jun 10 10:41 agent.s390x-rootfs.img 
rw-rr-. 1 root root 9257445 Jun 10 10:41 agent.s390x-kernel.img 
rw-rr-. 1 root root 64774443 Jun 10 10:41 agent.s390x-initrd.img 
rw-rr-. 1 root root 16 Jun 10 10:41 agent.s390x-initrd.addrsize 
rw-rr-. 1 root root 149 Jun 10 10:41 agent.s390x-generic.ins 
drwxr-x---. 2 root root 162 Jun 10 10:41 . 
drwxr-xr-x. 5 root root 4096 Jun 10 10:41 ..