Preferred configurations to Support TrustZone Software
On-SOC
 TrustZone Boot ROM - 8 to 16K Bytes for signature check code
 TrustZone RAM - 64 to 96K Bytes for data
 Tightly Coupled Memory - TrustZone would use 2K in Instruction and 200bytes
Data
 L1 Cache is application dependant
 L2 Cache is application dependant
 AES or 3DES key for signing/ hiding data in external FLASH
 Unique ID (can be part of above key)
 RSA Public key (OR SHA hash of RSA Public Key) to allow checking of signatures
on factory supplied code.