how to add MMIO peripherals to U500 design

[shirlynan]

Hi everyone,
I'm struggling with adding a custom MMIO peripheral to Freedom U500 design. I'm using a gcd example from the chipyard branch, however, I cant see my custom peripheral in the generated verilog files or memory map. So I think I missed something. What I have done is describe the GCD module under the rocket-chip folder and then instantiate it with the following code in Configs.scala in rocket-chip/src/main/scala/subsystem folder.
class WithGCD(useAXI4: Boolean, useBlackBox: Boolean) extends Config((site, here, up) => {
case GCDKey => Some(GCDParams(useAXI4 = useAXI4, useBlackBox = useBlackBox))
})
and add this config with the code
new WithGCD(useAXI4=false, useBlackBox=true) ++
to the BaseConfig of rocket-chip.
I'm not sure if I did the instantiation in a wrong way... It would be great if someone could give me a clue to solve this problem. Unfortunately, I cant find an tutorial for this purpose.

Thanks for your help.

[JohnsonZ-microe]

Your need to connect your MMIO ports to the top module, or it will be removed by FIRRTL' s optimization. I m struggling with this problem too, I have solved the problem you just met but unfortunately get stuck with the problem of Pins definition.