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Unit Test Flow

This flow contains simple sanity checks for specific pieces of functionality.

It is not a complete verification flow. It is only used to make sure a change hasn't done something catastrophic.

The unit tests are split into two main catagories:

  • The core unit tests use the core-level testbench, and are designed to probe features contained within the CPU core only.

  • The Core Complex (ccx) tests use the ccx-level testbench, which instantiates the core with some embedded SRAM, a ROM and a simple interconnect. These tests probe interractions within the CCX like memory mappings, bus errors and external memory port accesses.

Running the flow:

Build all of the unit tests:

make build-unit-tests-core  # Build all core level tests.
make build-unit-tests-ccx   # "     "   ccx  "     "

Run all of the unit tests:

make run-unit-tests-core    # Run all core level tests.
make run-unit-tests-ccx     # "   "   ccx  "     "

Build/run a specific test:

make build-unit-core-[TEST NAME]
make build-unit-ccx-[TEST NAME]
make run-unit-core-[TEST NAME]
make run-unit-ccx-[TEST NAME]

Flow outputs:

Outputs from each unit test simulation are put in

  • work/core/unit/[test name] for core-level tests.
  • work/ccx/unit/[test name] for ccx-level tests.

Each such directory contains:

  • A .vcd wave dump file.

  • The .elf file corresponding to the unit test program.

  • A disassembly of the .elf file.

  • A .srec of the .elf file. This is the format used to load the program into the simulator memory.

  • A .gtlwl file. This is derived from the disassembly, and can be used by GTKWave's translation function to display disassembled instructions in the wave form viewer.

Relevant files.

  • verif/share/unit - Contains Makefile and common code infrastructure used across the core and ccx unit tests.

  • verif/core/unit- Contains all unit tests for the core.

    • verif/core/unit/share - shared core level test code.

    • Each test lives in its own sub-directory.

  • verif/core/unit- Contains all unit tests for the ccx .

    • verif/ccx/unit/share - shared ccx level test code.

    • Each test lives in its own sub-directory.