So after cloning and building X86/gem5.opt, I started following the "Creating a 
simple configuration script" tutorial. I get the error when I run 
"build/X86/gem5.opt configs/tutorial/simple.py"

gem5 Simulator System.  http://gem5.org
gem5 is copyrighted software; use the --copyright option for details.

gem5 version 20.1.0.2
gem5 compiled Dec  4 2020 14:31:20
gem5 started Dec  4 2020 14:32:24
gem5 executing on ubuntu-bionic, pid 9028
command line: ./gem5/build/X86/gem5.opt simple.py

Here's the output log.

warn: membus.slave is deprecated. `slave` is now called `cpu_side_ports`
warn: membus.slave is deprecated. `slave` is now called `cpu_side_ports`
warn: membus.master is deprecated. `master` is now called `mem_side_ports`
warn: membus.slave is deprecated. `slave` is now called `cpu_side_ports`
warn: interrupts.int_master is deprecated. `int_master` is now called 
`int_requestor`
warn: membus.master is deprecated. `master` is now called `mem_side_ports`
warn: interrupts.int_slave is deprecated. `int_slave` is now called 
`int_responder`
warn: membus.slave is deprecated. `slave` is now called `cpu_side_ports`
warn: membus.master is deprecated. `master` is now called `mem_side_ports`
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "build/X86/python/m5/main.py", line 457, in main
  File "simple.py", line 36, in <module>
    system.mem_ctrl = DDR3_1600_8x8()
  File "build/X86/python/m5/SimObject.py", line 1363, in __setattr__
AttributeError: Class DDR3_1600_8x8 has no parameter port
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