Hey Mandrita, Some of the common configuration settings can be changed via the command line. Look in configs/common/Options.py in the gem5 directory to see the available options. For instance, adding '--cpu-clock=1GHz' will change the cpu clock frequency to 1 GHz.
However, there are a lot of options not exposed directly, but need to be changed in the relevant configuration scripts in configs/ or in *.py files in the src/ directory. A good place to start would be to simply search for the configuration name from config.ini within configs/ and src/ directories. This tutorial (especially part II) could also help you get started - http://www.lowepower.com/jason/learning_gem5/ Cheers, Swapnil Haria
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