The difference between dcbf and dccivac arm instructions

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I currently want to flush my descriptor to read the proper status bits. Can someone explain to me if I should be using dcbf or dccivac instruction? I fail to understand the right difference between them.

Thank you in advance :)

I have tried experimenting dcbf and dccivac both. I understand that dcbf flushes my address from cache but dccivac also marks the address as invalid. Please rectify my understanding.

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