I am not sure of your intent, almost all of the SRAM on these devices has ECC so reading uninitialized SRAM is not reliable as the ECC bits associated to that SRAM block are also uninitialized. You MUST have a write operation to set the ECC on the SRAM before reading it.
Is it necessary to initialize the RAM memory during startup? What if I skip initialization and what is benefit it initialized?
RAMINSEL[21:16] does it possible to initialize all the core RAM initialization simulteneously?