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Armv8-R AEM FVP AArch32 mode - Access to IMP_CBAR causes a crash

Refer Cortex R52 TRM, 3.3.17  "Configuration Base Address Register"

"The IMP_CBAR holds the physical base address of the memory-mapped GIC Distributor registers."

However when I try to access this register, it causes a trap as "Undefined instruction".

Can you help me here ?