Why XIP memory for variable storage?

[Meenakshi Aggarwal <meenakshi.aggarwal@nxp.com>]

Hi,


I want to implement Secure Uefi for my SoC and was looking for how keys and database were stored in edk2.

What i understood from the code is:
1.  We are using same memory space for storage of Secure and Non-Secure variables.
2.  We are assuming memory to be of XIP type.


Please help if above statements are correct and 
I want to use different memories for Secure and Non-Secure variables, 
e.g. i want my secure variables to be managed by my software running in EL3 or say a different memory which is not an XIP.


Is something similar exist in edk2 which i can refer?
Is any particular reason behind using XIP memory for variable storage?


Please help.


Thanks & Regards,
Meenakshi