config: Add a system clock command-line option

This patch adds a 'sys_clock' command-line option and use it to assign
clocks to the system during instantiation.

As part of this change, the default clock in the System class is
removed and whenever a system is instantiated a system clock value
must be set. A default value is provided for the command-line option.

The configs and tests are updated accordingly.

1 files changed, 4 insertions, 0 deletions

diff --git a/configs/example/fs.py b/configs/example/fs.py
index 31106cba7..cbcacd6d4 100644
--- a/configs/example/fs.py
+++ b/configs/example/fs.py
@@ -120,6 +120,8 @@ elif buildEnv['TARGET_ISA'] == "arm":
 else:
     fatal("Incapable of building %s full system!", buildEnv['TARGET_ISA'])
 
+test_sys.clock = options.sys_clock
+
 if options.kernel is not None:
     test_sys.kernel = binary(options.kernel)
 
@@ -172,6 +174,8 @@ if len(bm) == 2:
         drive_sys = makeArmSystem(drive_mem_mode, options.machine_type,
                                   DriveMemClass, bm[1])
 
+    drive_sys.clock = options.sys_clock
+
     drive_sys.cpu = DriveCPUClass(cpu_id=0)
     drive_sys.cpu.createThreads()
     drive_sys.cpu.createInterruptController()