[Hafnium] How to allow Hafnium to access a DRAM address space

Hi all,

I try to use Hafnium (deployed in SEL2) to access a DRAM address, e.g. 0xa000_0000, but failed.

I think the TTBR0_EL2 does not map this address space, or something wrong with TZASC.

To solve this problem, I first add the DRAM region in TZASC and TTBR0_EL3 (by modifying TF-A), and EL3 can access this address. But Hafnium cannot read or write it.

So, must I modify the .S files in Hafnium to add a page mapping to the DRAM space? Can I add this page in some C files? Or should I do something else?

Sincerely, Wang Chenxu