Agilex™ 5 ES Device Errata and User Guidelines

ID 825514
Date 12/09/2024
Public
Document Table of Contents

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