Hi,

I want to build up a SoC based on OR1200 and the memory controller
and conmax core written by Rudolf Usselmann.
Now I have the following problem: If I connect the memory controller to
slave port 2 (so its address space is 0x20000000-0x2FFFFFFF),
everything works fine. If I connect a Wishbone-only-wired version of
this controller (that means: only Wishbone wires wired, no external
memory attached) to slave port 0, I can access the registers, too. But
if I connect the controller with external wiring to slave port 0 (so its
address space is 0x00000000-0x0FFFFFFF), I can't access neither the
memory nor the registers.

My question is: What could cause this problem? Does anyone have a
hint for me how to solve this? Or (as a possible work around): Can
anyone give me a hint how to set the power-on value of the program
counter to an address other than 0x0?

Thank you!

Danny