family:
  - name: sifive_freedom
    series:
      - name: fe300
        socs:
          - name: fe310
      - name: fu500
        socs:
          - name: fu540
            cpuclusters:
              - name: e51
              - name: u54
      - name: fu700
        socs:
          - name: fu740
            cpuclusters:
              - name: s7
              - name: u74