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CC3220S-LAUNCHXL: How to build our own a chain of trust such as dummy-root-ca-cert • dummy-trusted-ca-cert • dummy-trusted-cert?

Part Number: CC3220S-LAUNCHXL

 dummy-root-ca-cert • dummy-trusted-ca-cert • dummy-trusted-cert these certs only just for create a security mucimg.bin ?

How to build them by us? Is there any introduce or guide for them?