2.5.1. Internal programmers view

With the exception of the PMU registers, the programmers view defaults to Secure access only, as follows:

Note

Some accesses might receive a response before they reach the CCI-400 registers and so do not receive a DECERR response nor affect the register values. An example of this is a cache maintenance operation that incorrectly addresses the CCI-400 register space.

You can override these security settings in the Secure Access Register. At reset, you can only access this using Secure requests, but if you write to it, this enables Non-secure access to all registers in the CCI-400 except for the Control Override Register and Secure Access Register. See Control Override Register and Secure Access Register.

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