old_contents: from m5 import *
  
  class HelloWorld(AlphaLiveProcess):
      executable = '../configs/test/hello'
      cmd = 'hello'
  
  mem = PhysicalMemory()
  cpu = SimpleCPU(workload=HelloWorld(), mem=mem)
  system = System(physmem=mem, cpu=cpu)
  root = Root(system=system)
  
new_contents: from m5 import *
  
  class HelloWorld(AlphaLiveProcess):
      executable = '../configs/test/hello'
      cmd = 'hello'
  
  magicbus = Bus()
  mem = PhysicalMemory(bus=magicbus)
  cpu = SimpleCPU(workload=HelloWorld(), mem=magicbus)
  system = System(physmem=mem, cpu=cpu)
  root = Root(system=system)
  
subject: update for objects having a bus