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EDDEVAFF0, External Debug Device Affinity register 0

The EDDEVAFF0 characteristics are:


Copy of the low half of the PE MPIDR_EL1 register that allows a debugger to determine which PE in a multiprocessor system the external debug component relates to.


If ARMv8.3-DoPD is implemented, this register is in the Core power domain. If ARMv8.3-DoPD is not implemented, this register is in the Debug power domain.


EDDEVAFF0 is a 32-bit register.

Field descriptions

The EDDEVAFF0 bit assignments are:


MPIDR_EL1lo, bits [31:0]

MPIDR_EL1 low half. Read-only copy of the low half of MPIDR_EL1, as seen from the highest implemented Exception level.

Accessing the EDDEVAFF0

EDDEVAFF0 can be accessed through the external debug interface:


This interface is accessible as follows:

  • When ARMv8.3-DoPD is not implemented or IsCorePowered() accesses to this register are RO.
  • Otherwise accesses to this register generate an error response.