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, 1 insertions, 0 deletions

diff --git a/tests/configs/o3-timing-mp-ruby.py b/tests/configs/o3-timing-mp-ruby.py
index 126e71ed5..0060689b8 100644
--- a/tests/configs/o3-timing-mp-ruby.py
+++ b/tests/configs/o3-timing-mp-ruby.py
@@ -40,6 +40,7 @@ ruby_memory = ruby_config.generate("TwoLevel_SplitL1UnifiedL2.rb", nb_cores)
 # system simulated
 system = System(cpu = cpus, physmem = ruby_memory, membus = CoherentBus(),
                 mem_mode = "timing")
+system.clock = '1GHz'
 
 for cpu in cpus:
     # create the interrupt controller