[Hafnium] How to test Armv8.4 without Hafnium

Hi all,

Sorry for asking this question, but I just want to do some tests about Armv8.4. In my scenario, I wanna boot with ATF, with Armv8.4-enabled FVP, but without Hafnium. I may need to boot a secure OS. I know how to boot it with Hafnium, but how about without Hafnium? Also, I still want some Armv8.4 features to manage my secure OS.

I think I may need (1) shell commands to compile the TF-A, and (2) shell commands to boot the FVP. Could you help me?

Sincerely, WANG Chenxu