Step Three: Configure the Host Domain - Step Three: Configure the Host Domain - 2026.1 English - UG1186

Set the CPU cluster to match your APU:

domains:
  APU_Linux:
    compatible: openamp,domain-v1
    cpus:
      - cluster: cpus_a78      # cpus_a72 for Versal devices, cpus_a53 for Zynq UltraScale+ MPSoC
        cpumask: 0xff           # all cores
        mode:
          secure: false          # Linux typically runs non-secure
          el: 0x3
    os,type: linux

Add reserved-memory references and list every shared region name:

reserved-memory:
      - vdev0vring0@9860000
      - vdev0vring1@9864000
      - vdev0buffer@9868000
      - ddrboot@9800100
      - rsctbl@9800000