This anomaly applies to Revision 2, build codes QFAA-C00, CAAA-C00, QDAA-C00, QGAA-C00.
It was inherited from the previous SoC revision Revision 1.
Symptoms
Peripheral security settings cannot be locked for the peripherals with split security features. User-selectable Arm® TrustZone® map cannot be locked for peripherals with split security features. When lock bit is set, secure code can change the peripheral and split security settings.
Conditions
PERM lock bit is set for configurable security peripherals. FEATURE lock bits are set for split security peripherals.
Consequences
The security settings cannot be locked.
Workaround
None. Ensure software running in a secure environment does not change the PERM or FEATURE registers.