Updated README

README.md

@@ -9,7 +9,7 @@ Download and build the [Sparta](https://github.com/sparcians/map) framework. Fol
 conda activate sparta
 mkdir release
 cd release
-CC=clang CXX=clang++ cmake .. -DCMAKE_BUILD_TYPE=Release
+cmake .. -DCMAKE_BUILD_TYPE=Release
 make
 ```
 
@@ -18,6 +18,15 @@ make
 make regress
 ```
 
+## Validate
+
+Atlas provides a helper script for running the RISC-V architecture unit tests from [riscv-software-src/riscv-tests](https://github.com/riscv-software-src/riscv-tests) Follow the directions on the [riscv-software-src/riscv-tests README](https://github.com/riscv-software-src/riscv-tests#readme) to build the tests.
+
+From the `sim` subdirectory of your build directory, run the following Python script to run the RV64 tests:
+```
+../../scripts/RunRiscVArchTest.py rv64 $RISCV_TESTS_PATH/isa/
+```
+
 ## Debug
 
 To build Atlas for debugging, Debug and FastDebug build types are available.