The Deployment Tool allows generation of SEA and SED files form the command line using the following commands:
cd <diamond_installtion_path>/bin/nt64
ddtcmd -oft -sspi -if <xcf file> -ofa <path for .sea> -ofd <path for .sed>
For more information about this, you can refer to Lattice Diamond Help > Reference Guides > Command Line Reference Guide > Command Line Tool Usage > Running the Deployment Tool from the Command Line