EPCS Controller & Altera development board

To read EPCS (for boot) you need some code.

This code is included the the quartos EPCS block - probably so that the address of the registers can determined (a fixed offset from the program counter).

So only the reset vector needs to point into the EPCS controller memory. Apart from that you should ignore the fact that it contains memory.

That memory block is actually a PITA. You get it even if you don't want to boot from EPCS.

It also forces you to allocate an instruction cache - which you might otherwise not need if all your code is in tightly coupled instruction memory.