Memory map for ARMv8-M TrustZone SOC's

Hello,

I was wondering what the memory map of an SOC that includes a ARMv8-M TrustZone enabled system would like. Is it fixed or is it variable ? Based on the ARMv8-M ARM, it appears that things like the SAU, MPU, NVIC etc are all memory mapped and are expected to be at fixed address. Does this mean there is one SAU and one MPU for an entire SOC even if it includes multiple ARMv8-M cores?

section b7.1 of the ARMv8-M ARM has a system address map which defines addresses and the memory properties. If this address map is fixed, why do we need an MPU which has configurable regions with different memory attributes ?

Thanks

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