[TF-A] security: BL2 at EL3 on v8a based system

Hi, With the RME feature BL2 has to run at EL3 instead of EL1_S. EL3 has a separate PAS not accessible to EL1_S.

Is there any harm in choosing to run BL2 at EL3 instead of BL2 at S_EL1 even for non-RME(v8a) systems? Given that EL3 and EL1_S have access to the same PAS. I am trying to revisit the motivation to run BL2 at EL1_S.

I see there was an old discussion at https://github.com/ARM-software/tf-issues/issues/445 The reasoning was not pointing to any issue in specific but a generic principle of less permissiveness.

Thanks Sandeep