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The TARGET_ISA variable would let you select one ISA from a list of possible ISAs. That has now been replaced with USE_ARM_ISA, USE_X86_ISA, etc, variables which are boolean on or off. That will allow any number of ISAs to be enabled or disabled individually. Enabling something other than exactly one of these will probably prevent you from getting a working gem5 binary, but those problems are being addressed in other, parallel change series. I decided to use the USE_ prefix since it was consistent with most other on/off variables we have in gem5. One noteable exception is the BUILD_GPU setting which, you could convincingly argue, is a better prefix than USE_. Another option would be to use CONFIG_, in anticipation of using a kconfig style config mechanism in gem5. It seemed premature to start using a CONFIG_ prefix here, and if we decide to switch to some other prefix like BUILD_, it should be a purposeful choice and not something somebody just starts using. Change-Id: I90fef2835aa4712782e6c1313fbf564d0ed45538 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/52491 Tested-by: kokoro <noreply+kokoro@google.com> Maintainer: Gabe Black <gabe.black@gmail.com> Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Learning_gem README ------------------- This directory contains the configuration scripts used in the "Learning gem5" book. The scripts contained in these directories are for educational purposes only and should not be used for architectural research as-is. "Learning gem5" is a work-in-progress book that is frequently updated. For the most up-to-date version of the book, see the website. http://gem5.org/documentation/learning_gem5/introduction This directory is broken into one subdirectory per part of the book. If you would like to contribute (please do!) the code for the Learning gem5 book is hosted on GitHub. https://github.com/powerjg/learning_gem5 Goals of these scripts ~~~~~~~~~~~~~~~~~~~~~~ These scripts are not necessarily useful outside the scope of the Learning gem5 book. The goal is to include the learning gem5 scripts, following the book as closely as possible, so that the regression tester will catch any changes that affect the book. For general users, these are *not* good scripts to use for running complex architectural experiments. These scripts *are* a good starting point example of how to write your own scripts for experiments. Feedback ~~~~~~~~ Send mail to jason@lowepower.com to provide feedback.