EDDEVID1, External Debug Device ID register 1
The EDDEVID1 characteristics are:
Provides extra information for external debuggers about features of the debug implementation.
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.
EDDEVID1 is a 32-bit register.
The EDDEVID1 bit assignments are:
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:
EDPCSR not implemented.
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.
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:
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.