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The REVIDR provides revision information, additional to that in the MIDR, which identifies minor fixes (errata) which may be present in a specific implementation of the Cortex®-A55 core.
REVIDR is a 32-bit register, and is part of the Identification registers functional group.
This register is Read Only.
AArch32 System register REVIDR is architecturally mapped to AArch64 System register REVIDR_EL1. See B2.92 REVIDR_EL1, Revision ID Register, EL1.
There is one instance of this register that is used in both Secure and Non-secure states.