There is no self-enforced ratchet check available for OEM owned software components.
The loader enforced ratchet check is performed by the corresponding loader of the binaries.
Apart from MB1-BCT, all OEM owned firmware ratchet levels are set in MB1-BCT and in the Binary Component Header (BCH) while flashing the target or generating binaries offline.
The loader for the binaries compares the ratchet value of the binary in BCH too see whether it is lower or equal to its ratchet value in MB1-BCT.
MB1-BCT is the only OEM owned firmware that is hardware ratcheted using hardware fuses dedicated for MB1-BCT.