misc: revert riscvmatched-fs.py due to a bug

- link to issue https://github.com/gem5/gem5/issues/1554

Change-Id: Ic9cf6e5166eeee2226b6022e6f7c971d4e7caaeb

configs/example/gem5_library/riscvmatched-fs.py

@@ -43,7 +43,6 @@ import argparse
 from gem5.isas import ISA
 from gem5.prebuilt.riscvmatched.riscvmatched_board import RISCVMatchedBoard
 from gem5.resources.resource import obtain_resource
-from gem5.simulate.exit_event import ExitEvent
 from gem5.simulate.simulator import Simulator
 from gem5.utils.requires import requires
 
@@ -77,33 +76,12 @@ board = RISCVMatchedBoard(
 # In the case where the `-i` flag is passed, we add the kernel argument
 # `init=/root/exit.sh`. This means the simulation will exit after the Linux
 # Kernel has booted.
-workload = obtain_resource("riscv-ubuntu-24.04-boot", resource_version="1.0.0")
+workload = obtain_resource("riscv-ubuntu-20.04-boot", resource_version="3.0.0")
 kernel_args = board.get_default_kernel_args()
 if args.to_init:
     kernel_args.append("init=/root/exit.sh")
 workload.set_parameter("kernel_args", kernel_args)
 board.set_workload(workload)
 
-
-def exit_event_handler():
-    print("First exit: kernel booted")
-    yield False  # gem5 is now executing systemd startup
-    print("Second exit: Started `after_boot.sh` script")
-    # The after_boot.sh script is executed after the kernel and systemd have
-    # booted.
-    yield False  # gem5 is now executing the `after_boot.sh` script
-    print("Third exit: Finished `after_boot.sh` script")
-    # The after_boot.sh script will run a script if it is passed via
-    # m5 readfile. This is the last exit event before the simulation exits.
-    yield True
-
-
-simulator = Simulator(
-    board=board,
-    on_exit_event={
-        # Here we want override the default behavior for the first m5 exit
-        # exit event.
-        ExitEvent.EXIT: exit_event_handler()
-    },
-)
+simulator = Simulator(board=board)
 simulator.run()