Loading SRAM,SDRAM or FLASH on DE1, using Linux, without Qsys, SOPC or NIOS

Dave,

I am (slowly) recreating an 8-bit computer from the late 80s.

As I can't post links yet, Google for "nyangau" and "memotech", and follow the link to REMEMOTECH.

I need quite a lot of ROM data persisted somewhere, so I am thinking Flash.

I need much more RAM than will fit on-chip, so I am thinking SRAM.

I am also thinking of using SDRAM as "Silicon disc".

As the flash has 70ns access time, I may need to add wait states to the CPU,

and perhaps arrange that the bootstrap code copy from flash to SRAM, make it read-only, so as to speed up future accesses.

In the interim before working out the above paragraph, I was planning to pre-load SRAM directly.

Being able to preload SDRAM is for bonus points really, as it would give me a way to preload much larger "disc" content.

But I'm actually wondering how practical this might be, due to the need for continual refresh.

{{{ Andy