diff --git a/hw/dv/tools/dvsim/common_sim_cfg.hjson b/hw/dv/tools/dvsim/common_sim_cfg.hjson
index 002fa57..bcc7e0c 100644
--- a/hw/dv/tools/dvsim/common_sim_cfg.hjson
+++ b/hw/dv/tools/dvsim/common_sim_cfg.hjson
@@ -71,6 +71,7 @@
 
   // Default list of things to export to shell
   exports: [
+    { SCRATCH_BASE_PATH: "{scratch_base_path}" },
     { TOOL_SRCS_DIR: "{tool_srcs_dir}" },
     { SIMULATOR: "{tool}" },
     { WAVES: "{waves}" },
@@ -138,6 +139,7 @@
 
   // Project defaults for VCS
   vcs_cov_cfg_file: "{{build_mode}_vcs_cov_cfg_file}"
+  vcs_unr_cfg_file: "{tool_srcs_dir}/unr.cfg"
   vcs_cov_excl_files: ["{tool_srcs_dir}/common_cov_excl.el"]
 
   // Build-specific coverage cfg files for VCS.
diff --git a/hw/dv/tools/dvsim/sim.mk b/hw/dv/tools/dvsim/sim.mk
index 341e966..adceb0b 100644
--- a/hw/dv/tools/dvsim/sim.mk
+++ b/hw/dv/tools/dvsim/sim.mk
@@ -115,6 +115,14 @@
 ############################
 ## coverage rated targets ##
 ############################
+cov_unr_build: gen_sv_flist
+	@echo "[make]: cov_unr_build"
+	cd ${sv_flist_gen_dir} && ${cov_unr_build_cmd} ${cov_unr_build_opts}
+
+cov_unr: cov_unr_build
+	@echo "[make]: cov_unr"
+	cd ${sv_flist_gen_dir} && ${cov_unr_run_cmd} ${cov_unr_run_opts}
+
 # Merge coverage if there are multiple builds.
 cov_merge:
 	@echo "[make]: cov_merge"
diff --git a/hw/dv/tools/dvsim/vcs.hjson b/hw/dv/tools/dvsim/vcs.hjson
index 812eae8..c5d86de 100644
--- a/hw/dv/tools/dvsim/vcs.hjson
+++ b/hw/dv/tools/dvsim/vcs.hjson
@@ -152,6 +152,40 @@
   cov_report_txt:       "{cov_report_dir}/dashboard.txt"
   cov_report_page:      "dashboard.html"
 
+  // UNR related.
+  // All code coverage, assert isn't supported
+  cov_unr_metrics: "line+cond+fsm+tgl+branch"
+  cov_unr_dir:     "{scratch_base_path}/cov_unr"
+
+  cov_unr_common_build_opts: ["-sverilog -full64 -licqueue -ntb_opts uvm-1.2",
+                              "-timescale=1ns/1ps"]
+
+  // Use recommended UUM (Unified usage model) 3 steps flow. The other flow defines macro
+  // "SYNTHESIS", which we have used in design
+  cov_unr_build_cmd: [// Step 1
+                      "{job_prefix} vlogan {cov_unr_common_build_opts} &&",
+                      // Step 2
+                      "{job_prefix} vlogan {cov_unr_common_build_opts}",
+                      // grep all defines from {build_opts} from step 2
+                      '''{eval_cmd} opts=`echo {build_opts}`; defines=; d=; \
+                      for o in $opts; \
+                      do \
+                        d=`echo $o | grep -o '+define+.*'`; \
+                        defines="$defines $d"; \
+                      done; \
+                      echo $defines
+                      ''',
+                      "-f {sv_flist} &&",
+                      // Step 3
+                      "{job_prefix} vcs {cov_unr_common_build_opts}"]
+  cov_unr_build_opts: ["-cm {cov_unr_metrics}",
+                       "{vcs_cov_cfg_file}",
+                       "-unr={vcs_unr_cfg_file}",
+                       "{dut}"]
+
+  cov_unr_run_cmd:   ["{job_prefix} ./unrSimv"]
+  cov_unr_run_opts:  ["-unr"]
+
   // Analyzing coverage - this is done by invoking --cov-analyze switch. It opens up the
   // GUI for visual analysis.
   cov_analyze_dir:  "{scratch_base_path}/cov_analyze"
diff --git a/hw/dv/tools/vcs/unr.cfg b/hw/dv/tools/vcs/unr.cfg
new file mode 100644
index 0000000..1a6711a
--- /dev/null
+++ b/hw/dv/tools/vcs/unr.cfg
@@ -0,0 +1,23 @@
+# Copyright lowRISC contributors.
+# Licensed under the Apache License, Version 2.0, see LICENSE for details.
+# SPDX-License-Identifier: Apache-2.0
+
+-covInput $SCRATCH_BASE_PATH/cov_merge/merged.vdb
+-covDUT $dut_instance
+
+# Provide the clock specification
+-clock clk 100
+# Provide the reset specification: signal_name, active_value, num clk cycles reset to be active
+-reset rst_n 0 20
+
+# Black box some of the modules
+# -blackBoxes -type design *
+
+# Include common el file, so that it doesn't generate reviewed common exclusions
+-covEL $TOOL_SRCS_DIR/common_cov_excl.el
+
+# Name of the generated exclusion file
+-save_exclusion $SCRATCH_BASE_PATH/cov_unr/unr_exclude.el
+
+# Enables verbose reporting in addition to summary reporting.
+-verboseReport
diff --git a/hw/ip/flash_ctrl/dv/flash_ctrl_sim_cfg.hjson b/hw/ip/flash_ctrl/dv/flash_ctrl_sim_cfg.hjson
index aab05cf..82ebe0c 100644
--- a/hw/ip/flash_ctrl/dv/flash_ctrl_sim_cfg.hjson
+++ b/hw/ip/flash_ctrl/dv/flash_ctrl_sim_cfg.hjson
@@ -6,7 +6,7 @@
   name: flash_ctrl
 
   // Top level dut name (sv module).
-  dut: flash_ctrl
+  dut: flash_ctrl_wrapper
 
   // Top level testbench name (sv module).
   tb: tb
diff --git a/hw/top_earlgrey/dv/chip_sim_cfg.hjson b/hw/top_earlgrey/dv/chip_sim_cfg.hjson
index 95bdc4b..b4aae3f 100644
--- a/hw/top_earlgrey/dv/chip_sim_cfg.hjson
+++ b/hw/top_earlgrey/dv/chip_sim_cfg.hjson
@@ -6,7 +6,7 @@
   name: chip
 
   // Top level dut name (sv module).
-  dut: top_earlgrey
+  dut: top_earlgrey_asic
 
   // Top level testbench name (sv module).
   tb: tb
diff --git a/util/dvsim/Deploy.py b/util/dvsim/Deploy.py
index 6cd7eec..91e3ec0 100644
--- a/util/dvsim/Deploy.py
+++ b/util/dvsim/Deploy.py
@@ -843,6 +843,55 @@
         return RunTest.seeds.pop(0)
 
 
+class CovUnr(Deploy):
+    """
+    Abstraction for coverage UNR flow.
+    """
+
+    # Register all builds with the class
+    items = []
+
+    def __init__(self, sim_cfg):
+        # Initialize common vars.
+        super().__init__(sim_cfg)
+
+        self.target = "cov_unr"
+        self.mandatory_cmd_attrs.update({
+            # tool srcs
+            "tool_srcs": False,
+            "tool_srcs_dir": False,
+
+            # Need to generate filelist based on build mode
+            "sv_flist_gen_cmd": False,
+            "sv_flist_gen_dir": False,
+            "sv_flist_gen_opts": False,
+            "build_dir": False,
+            "cov_unr_build_cmd": False,
+            "cov_unr_build_opts": False,
+            "cov_unr_run_cmd": False,
+            "cov_unr_run_opts": False
+        })
+
+        self.mandatory_misc_attrs.update({
+            "cov_unr_dir": False,
+            "build_fail_patterns": False
+        })
+
+        super().parse_dict(sim_cfg.__dict__)
+        self.__post_init__()
+
+        self.pass_patterns = []
+        # Reuse fail_patterns from sim build
+        self.fail_patterns = self.build_fail_patterns
+
+        # Start fail message construction
+        self.fail_msg = "\n**COV_UNR:** {}<br>\n".format(self.name)
+        log_sub_path = self.log.replace(self.sim_cfg.scratch_path + '/', '')
+        self.fail_msg += "**LOG:** $scratch_path/{}<br>\n".format(log_sub_path)
+
+        CovUnr.items.append(self)
+
+
 class CovMerge(Deploy):
     """
     Abstraction for merging coverage databases. An item of this class is created AFTER
diff --git a/util/dvsim/SimCfg.py b/util/dvsim/SimCfg.py
index 05b571e..238359d 100644
--- a/util/dvsim/SimCfg.py
+++ b/util/dvsim/SimCfg.py
@@ -12,13 +12,15 @@
 import sys
 from collections import OrderedDict
 
-from Deploy import CompileSim, CovAnalyze, CovMerge, CovReport, Deploy, RunTest
+from Deploy import (CompileSim, CovAnalyze, CovMerge, CovReport, CovUnr,
+                    Deploy, RunTest)
 from FlowCfg import FlowCfg
 from Modes import BuildModes, Modes, Regressions, RunModes, Tests
 from tabulate import tabulate
-from testplanner import class_defs, testplan_utils
 from utils import VERBOSE, find_and_substitute_wildcards
 
+from testplanner import class_defs, testplan_utils
+
 
 def pick_wave_format(fmts):
     '''Pick a supported wave format from a list.
@@ -508,8 +510,6 @@
         if self.cov:
             self.cov_merge_deploy = CovMerge(self)
             self.cov_report_deploy = CovReport(self)
-            # Generate reports only if merge was successful; add it as a dependency
-            # of merge.
             self.cov_merge_deploy.sub.append(self.cov_report_deploy)
 
         # Create initial set of directories before kicking off the regression.
@@ -542,6 +542,9 @@
         '''Use the last regression coverage data to open up the GUI tool to
         analyze the coverage.
         '''
+        # Create initial set of directories, such as dispatched, passed etc.
+        self._create_dirs()
+
         cov_analyze_deploy = CovAnalyze(self)
         self.deploy = [cov_analyze_deploy]
 
@@ -551,6 +554,26 @@
         for item in self.cfgs:
             item._cov_analyze()
 
+    def _cov_unr(self):
+        '''Use the last regression coverage data to generate unreachable
+        coverage exclusions.
+        '''
+        # TODO, Only support VCS
+        if self.tool != 'vcs':
+            log.error("Currently only support VCS for coverage UNR")
+            sys.exit(1)
+        # Create initial set of directories, such as dispatched, passed etc.
+        self._create_dirs()
+
+        cov_unr_deploy = CovUnr(self)
+        self.deploy = [cov_unr_deploy]
+
+    def cov_unr(self):
+        '''Public facing API for analyzing coverage.
+        '''
+        for item in self.cfgs:
+            item._cov_unr()
+
     def _gen_results(self):
         '''
         The function is called after the regression has completed. It collates the
diff --git a/util/dvsim/dvsim.py b/util/dvsim/dvsim.py
index 53ccc62..f4bef41 100755
--- a/util/dvsim/dvsim.py
+++ b/util/dvsim/dvsim.py
@@ -441,6 +441,11 @@
                             'coverage database directory with the new '
                             'coverage database.'))
 
+    covg.add_argument("--cov-unr",
+                      action='store_true',
+                      help=('Run coverage UNR analysis and generate report. '
+                            'This only supports VCS now.'))
+
     covg.add_argument("--cov-analyze",
                       action='store_true',
                       help=('Rather than building or running any tests, '
@@ -572,6 +577,17 @@
         cfg.print_list()
         sys.exit(0)
 
+    # Purge the scratch path if --purge option is set.
+    if args.purge:
+        cfg.purge()
+
+    # If --cov-unr is passed, run UNR to generate report for unreachable
+    # exclusion file.
+    if args.cov_unr:
+        cfg.cov_unr()
+        cfg.deploy_objects()
+        sys.exit(0)
+
     # In simulation mode: if --cov-analyze switch is passed, then run the GUI
     # tool.
     if args.cov_analyze:
@@ -579,10 +595,6 @@
         cfg.deploy_objects()
         sys.exit(0)
 
-    # Purge the scratch path if --purge option is set.
-    if args.purge:
-        cfg.purge()
-
     # Deploy the builds and runs
     if args.items != []:
         # Create deploy objects.