Hi all!
We've some custom boards with i486 processor, some RAM, some dual port ram and other stuff (interrupt controller, buffers, I/O transceiver and so on). I'm investigating the opportunity to replace all of those discrete ICs with soft/hard IP (cycle accurate), and syntesize the system in an FPGA (Altera or Xilinx).
Actually I don't care about costs and efforts that are involved in this approach. The goal is to get a replacement for that processor without re-writing the operating system and any other kernel routines.
Any suggestions?