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1. Remove the existing YAC subdirectory from ${TOP}/yaml, or arrange to use new subdirectory name.
2. Untar the YAC file under ${TOP}/yaml.
3. In the IOC startup script st.cmd, update the 2nd parameter of YCPSWASYNConfig() to point to the 000TopLevel.yaml file within the YAC.
   For example, "yaml/AmcCarrierBcm_project.yaml/000TopLevel.yaml".

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Before installing a YDC file a couple of fixups are typically required.

1. Insert a new top-level hierarchy, "mmio", above "AmcCarrierCore".
2. Change the value of mmio:AmcCarrierCore:AxiVersion:ScratchPad to 0xfc067333.

Excerpt from an example YDC file with fixups applied:

# Config File Generated: 2017-03-07.13:29:59
- mmio:
  - AmcCarrierCore:
      - AxiVersion:
          - MasterReset: !<value> 0x0
          - FpgaReloadAddress: !<value> 0x00000000
          - FpgaReload: !<value> 0x0
          - FpgaReloadHalt: !<value> 0x0
          - ScratchPad: !<value> 0xfc067333

To install a new YDC:

1. Copy the YDC file to the ${TOP}/yaml directory.
2. In in IOC startup script st.cmd, update the LOAD_FILE macro of the dbLoadRecords(dv/saveLoadConfig.db) command to point to the YDF file. For example, "LOAD_FILE=yaml/defaults_bcm.yaml".

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