Visible to Intel only — GUID: ovo1685984430842
Ixiasoft
Visible to Intel only — GUID: ovo1685984430842
Ixiasoft
3.4.4. 1580900: Incorrect EDPFR value
Description
The EDPFR register is an external debug register that provides information about implemented PE features. When the DSU is used with a core that implements the Armv8.4-A architecture, the EDPFR.GIC field will indicate that the GICv4 system register interface is supported even when the GICv4.1 system register interface is supported.
Conditions
The external debugger reads the EDPFR register and uses the contents of the GIC field (bits [27:24]).
Impact
Arm does not expect the external debugger will need to use the contents of the GIC field. If it does, then it might incorrectly decide that GICv4.1 features are not supported by the core. The system register ID_AA64PFR0_EL1 is unaffected and provides the correct information about the GIC system register interface support implemented.
Workaround
No workaround is necessary.
Category
Category C