configs: Add Tarmac tracing option to the simple Arm configs

gem5 supports Tarmac trace generation for Arm simulations, but there
are no examples of how to use this feature.

This patch adds a `--tarmac-gen` option to three of the simple Arm
configs. Tarmac generation is useful for out-of-the-box users, and
this patch also provides an example of how to use the Tarmac
generation feature.

Change-Id: I0d3c523b5c0bb6d94de93bc502e4451622fb635d
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/69684
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>

configs/example/arm/starter_fs.py

@@ -129,7 +129,13 @@ def create(args):
     # Add CPU clusters to the system
     system.cpu_cluster = [
         devices.ArmCpuCluster(
-            system, args.num_cores, args.cpu_freq, "1.0V", *cpu_types[args.cpu]
+            system,
+            args.num_cores,
+            args.cpu_freq,
+            "1.0V",
+            *cpu_types[args.cpu],
+            tarmac_gen=args.tarmac_gen,
+            tarmac_dest=args.tarmac_dest,
         )
     ]
 
@@ -257,6 +263,17 @@ def main():
         default="2GB",
         help="Specify the physical memory size",
     )
+    parser.add_argument(
+        "--tarmac-gen",
+        action="store_true",
+        help="Write a Tarmac trace.",
+    )
+    parser.add_argument(
+        "--tarmac-dest",
+        choices=TarmacDump.vals,
+        default="stdoutput",
+        help="Destination for the Tarmac trace output. [Default: stdoutput]",
+    )
     parser.add_argument("--checkpoint", action="store_true")
     parser.add_argument("--restore", type=str, default=None)