trustzone memory configuration for cortex-A57

Hello,

I am using jetson tx2 development board which has arm cortex a57 processor which uses arm trusted firmware(atf) to boot. Trusty is the secure world operating system provided by atf.

Following are my questions:

1) How to configure how much ram both secure and normal world should use?

2) How does the boot-loader figure out how much ram is available in the system?

3) How can secure world access memory from the normal world? 

I tried looking for documentation but couldn't find any relevant documents. If you can answer my questions or point me to some manual, it will be very helpful.

thanks.

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