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EDDEVID1, External Debug Device ID register 1

The EDDEVID1 characteristics are:

Purpose

Provides extra information for external debuggers about features of the debug implementation.

Configuration

If FEAT_DoPD is implemented, this register is in the Core power domain.

If FEAT_DoPD is not implemented, this register is in the Debug power domain.

Attributes

EDDEVID1 is a 32-bit register.

Field descriptions

The EDDEVID1 bit assignments are:

313029282726252423222120191817161514131211109876543210
RES0PCSROffset

Bits [31:4]

Reserved, RES0.

PCSROffset, bits [3:0]

This field indicates the offset applied to PC samples returned by reads of EDPCSR. Permitted values of this field in Armv8 are:

PCSROffsetMeaning
0b0000

EDPCSR not implemented.

0b0010

EDPCSR implemented, and samples have no offset applied and do not sample the instruction set state in AArch32 state.

When FEAT_PCSRv8p2 is implemented, the only permitted value is 0b0000.

Note

FEAT_PCSRv8p2 implements the PC Sample-based Profiling Extension in the Performance Monitors register space, as indicated by the value of PMDEVID.PCSample.

Accessing the EDDEVID1

EDDEVID1 can be accessed through the external debug interface:

ComponentOffsetInstance
Debug0xFC4EDDEVID1

This interface is accessible as follows:

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