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+## Overview
+
+This is a SV/UVM testbench for the ibex core verification. This testbench
+loads the instruction binary generated from open source random instruction
+generator [riscv-dv](http://https://github.com/google/riscv-dv), runs the
+RTL simulation, and compares the instruction trace against ISS simulation.
+
+### Testbench component
+
+- Random instruction generator : [RISCV-DV](http://https://github.com/google/riscv-dv)
+- [Memory interface agent for instruction fetch and load/store operations](https://github.com/lowRISC/ibex/tree/master/dv/uvm/common/ibex_mem_intf_agent)
+- [Interrupt interface agent](https://github.com/lowRISC/ibex/tree/master/dv/uvm/common/irq_agent)
+- [Memory model](https://github.com/lowRISC/ibex/tree/master/dv/uvm/common/mem_model)
+- [Test and sequence library](https://github.com/lowRISC/ibex/tree/master/dv/uvm/tests)
+
+### Testplan
+
+The goal of this bench is to fully verify the ibex core with 100% coverage. This
+includes all RV32IMC instructions testing, privileged spec compliance, exception
+and interrupt testing, debug mode operations etc. The complete test list can be
+found [here](https://github.com/lowRISC/ibex/blob/master/dv/uvm/riscv_dv_extension/testlist.yaml).
+
+Please note that this work is still working in progress.
+
+## Getting Started
+
+### Prerequisites
+
+- VCS RTL simulator (need to support UVM 1.2)
+- [Setup the RISC-V instruction generator and ISS sim environment](https://github.com/google/riscv-dv#getting-started)
+
+### End-to-end RTL/ISS co-simulation flow
+
+![Flow chart](flow.png)
+
+The flow is controlled by a [Makefile](Makefile), here's the list of frequently
+used commands:
+
+```
+// Run a full regression
+make
+
+// Run a full regression, redirect the output directory
+make OUT=xxx
+
+// Run a single test
+make TEST=riscv_machine_mode_rand_test ITERATIONS=1
+
+// Run a test with a specific seed, dump waveform
+make TEST=riscv_machine_mode_rand_test ITERATIONS=1 SEED=123 WAVES=1
+
+// Verbose logging
+make ... VERBOSE=1
+
+// Run multipe tests in parallel through LSF
+make ... LSF_CMD="bsub -Is"
+
+// Get command reference of the simulation script
+python3 sim.py --help
+
+// Generate the assembly tests only
+make gen
+
+// Pass addtional options to the generator
+make GEN_OPTS="xxxx"  ...
+
+// Compile and run RTL simulation
+make TEST=xxx compile,rtl_sim
+
+// Use a different ISS (default is spike)
+make ... ISS=ovpsim
+
+// Run a full regression with coverage
+make COV=1
+
+```
+
+### Run with a different RTL simulator
+
+You can add the compile/simulation options in [simulator.yaml](yaml/rtl_simulation.yaml).
+
+```
+// Use the new RTL simulator to run
+make ... SIMULATOR=xxx
+
+```
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