nvm config scripts do not work properly

[ccccrrrr]

Describe the bug
The given script configs/nvm/sweep.py and configs/nvm/sweep_hybrid.py do not work properly.

Affects version
The latest version: Version 23.0.1.0

gem5 Modifications
N/A

To Reproduce
Steps to reproduce the behavior. Please assume starting from a clean repository:

1. Compile gem5 with command /usr/bin/env python3 $(which scons) build/X86/gem5.opt -j32
2. Execute the simulation with build/X86/gem5.opt configs/nvm/sweep.py or build/X86/gem5.opt configs/nvm/sweep_hybrid.py

Terminal Output

command line: build/X86/gem5.opt configs/nvm/sweep.py

AttributeError: object 'HeteroMemCtrl' has no attribute 'dram'
  (C++ object is not yet constructed, so wrapped C++ methods are unavailable.)

At:
  src/python/m5/SimObject.py(847): __getattr__
  configs/nvm/sweep.py(122): <module>
  src/python/m5/main.py(630): main

and

command line: build/X86/gem5.opt configs/nvm/sweep_hybrid.py

fatal: This script assumes the controller is a HeteroMemCtrl subclass

Host Operating System
Ubuntu 20.04.3 LTS

Host ISA
X86

Compiler used
gcc9.4.9, Python 3.8.10

Additional information
I think the problem lies in the memory creation process in configs/common/MemConfig.py does not match the expectations of memory creation in config/nvm. For example, in configs/nvm/sweep.py, line118:

# the following assumes that we are using the native memory
# controller with an NVM interface, check to be sure
if not isinstance(system.mem_ctrls[0], m5.objects.MemCtrl):
    fatal("This script assumes the controller is a MemCtrl subclass")
if not isinstance(system.mem_ctrls[0].dram, m5.objects.NVMInterface):
    fatal("This script assumes the memory is a NVMInterface class")

the script assumes system.mem_ctrl[0].dram will store nvm interface, but in configs/common/MemConfig.py, line256, there is:

                # Create a controller if not sharing a channel with DRAM
                # in which case the controller has already been created
                if not opt_hybrid_channel:
                    mem_ctrl = m5.objects.HeteroMemCtrl()
                    mem_ctrl.nvm = nvm_intf

                    mem_ctrls.append(mem_ctrl)
                else:
                    ...

it just put nvm_intf in nvm. However, simply change the above mem_ctrl.nvm to mem_ctrl.dram does not solve the problem, and will cause other errors.

[BobbyRBruce]

I believe this is fixed by #1114 . Closing.