Change tests submodule branch

Change-Id: I2d6eb67b0f431b41e25c8f37dc087c7fbd54c47e

README

@@ -1,24 +1,23 @@
-This is the gem5 simulator.
+## CAPStone gem5 simulator
 
-The main website can be found at http://www.gem5.org
+This repo contains an out of order CPU model for CAPStone, built on top
+of gem5's O3 CPU model. This design is intended to be used for performance evaluations.
 
-A good starting point is http://www.gem5.org/about, and for
-more information about building the simulator and getting started
-please see http://www.gem5.org/documentation and
-http://www.gem5.org/documentation/learning_gem5/introduction.
+This version of the CAPStone implementation is based on the CAPStone Academic Spec (vxx.xx, link)
 
-To build gem5, you will need the following software: g++ or clang,
-Python (gem5 links in the Python interpreter), SCons, zlib, m4, and lastly
-protobuf if you want trace capture and playback support. Please see
-http://www.gem5.org/documentation/general_docs/building for more details
-concerning the minimum versions of these tools.
+## Dependencies
 
-Once you have all dependencies resolved, type 'scons
-build/<CONFIG>/gem5.opt' where CONFIG is one of the options in build_opts like
-ARM, NULL, MIPS, POWER, SPARC, X86, Garnet_standalone, etc. This will build an
-optimized version of the gem5 binary (gem5.opt) with the the specified
-configuration. See http://www.gem5.org/documentation/general_docs/building for
-more details and options.
+To build, make sure you have apptainer installed.
+Then simply run the following from the project root directory:
+
+```
+   chmod +x run.sh
+   ./run.sh <NUM_THREADS>
+```
+
+This will automatically build an apptainer image with all dependencies
+required to build gem5, and use that image to build gem5 and run Capstone
+functional tests.
 
 The main source tree includes these subdirectories:
    - build_opts: pre-made default configurations for gem5
@@ -31,13 +30,3 @@ The main source tree includes these subdirectories:
    - system: source for some optional system software for simulated systems
    - tests: regression tests
    - util: useful utility programs and files
-
-To run full-system simulations, you may need compiled system firmware, kernel
-binaries and one or more disk images, depending on gem5's configuration and
-what type of workload you're trying to run. Many of those resources can be
-downloaded from http://resources.gem5.org, and/or from the git repository here:
-https://gem5.googlesource.com/public/gem5-resources/
-
-If you have questions, please send mail to [email protected]
-
-Enjoy using gem5 and please share your modifications and extensions.