diff --git a/sim/imperas.ic b/sim/imperas.ic
index ad19aaf68..8ac8dd64e 100644
--- a/sim/imperas.ic
+++ b/sim/imperas.ic
@@ -14,6 +14,9 @@
 --override cpu/add_implicit_Extensions=B 
 --override cpu/bitmanip_version=1.0.0
 
+# ????
+--override cpu/Zicbom=T
+
 #  clarify
 #--override refRoot/cpu/mtvec_sext=F
 
diff --git a/sim/wally-imperas.do b/sim/wally-imperas.do
index e4cd75f38..6a24b653d 100644
--- a/sim/wally-imperas.do
+++ b/sim/wally-imperas.do
@@ -32,6 +32,7 @@ vlog +incdir+../config/$1 \
      +incdir+$env(IMPERAS_HOME)/ImpProprietary/include/host \
      $env(IMPERAS_HOME)/ImpPublic/source/host/rvvi/rvviApiPkg.sv    \
      $env(IMPERAS_HOME)/ImpPublic/source/host/rvvi/rvviTrace.sv      \
+     $env(IMPERAS_HOME)/ImpProprietary/source/host/idv/idvApiPkg.sv  \
      $env(IMPERAS_HOME)/ImpProprietary/source/host/idv/idvPkg.sv   \
      $env(IMPERAS_HOME)/ImpProprietary/source/host/idv/idvApiPkg.sv \
      $env(IMPERAS_HOME)/ImpProprietary/source/host/idv/trace2api.sv  \
diff --git a/testbench/testbench-linux-imperas.sv b/testbench/testbench-linux-imperas.sv
index 79b354cb0..3deac00f0 100644
--- a/testbench/testbench-linux-imperas.sv
+++ b/testbench/testbench-linux-imperas.sv
@@ -302,11 +302,12 @@ module testbench;
       initial begin
         int iter;
         #1;
-        IDV_MAX_ERRS = 3;
+        IDV_MAX_ERRORS = 3;
 
         // Initialize REF (do this before initializing the DUT)
         if (!rvviVersionCheck(RVVI_API_VERSION)) begin
-          msgfatal($sformatf("%m @ t=%0t: Expecting RVVI API version %0d.", $time, RVVI_API_VERSION));
+          $display($sformatf("%m @ t=%0t: Expecting RVVI API version %0d.", $time, RVVI_API_VERSION));
+          $fatal;
         end
       
         void'(rvviRefConfigSetString(IDV_CONFIG_MODEL_VENDOR,            "riscv.ovpworld.org"));
@@ -316,7 +317,8 @@ module testbench;
         void'(rvviRefConfigSetInt(IDV_CONFIG_MAX_NET_LATENCY_RETIREMENTS, 6));
 
         if (!rvviRefInit("")) begin
-          msgfatal($sformatf("%m @ t=%0t: rvviRefInit failed", $time));
+          $display($sformatf("%m @ t=%0t: rvviRefInit failed", $time));
+          $fatal;
         end
 
         // Volatile CSRs
diff --git a/testbench/testbench_imperas.sv b/testbench/testbench_imperas.sv
index 41a6db450..ac7e49a48 100644
--- a/testbench/testbench_imperas.sv
+++ b/testbench/testbench_imperas.sv
@@ -140,11 +140,12 @@ module testbench;
 
     initial begin 
       
-      IDV_MAX_ERRS = 3;
+      IDV_MAX_ERRORS = 3;
 
       // Initialize REF (do this before initializing the DUT)
       if (!rvviVersionCheck(RVVI_API_VERSION)) begin
-        msgfatal($sformatf("%m @ t=%0t: Expecting RVVI API version %0d.", $time, RVVI_API_VERSION));
+        $display($sformatf("%m @ t=%0t: Expecting RVVI API version %0d.", $time, RVVI_API_VERSION));
+        $fatal;
       end
       void'(rvviRefConfigSetString(IDV_CONFIG_MODEL_VENDOR,            "riscv.ovpworld.org"));
       void'(rvviRefConfigSetString(IDV_CONFIG_MODEL_NAME,              "riscv"));
@@ -153,7 +154,8 @@ module testbench;
       void'(rvviRefConfigSetInt(IDV_CONFIG_MAX_NET_LATENCY_RETIREMENTS, 6));
 
       if (!rvviRefInit(elffilename)) begin
-        msgfatal($sformatf("%m @ t=%0t: rvviRefInit failed", $time));
+        $display($sformatf("%m @ t=%0t: rvviRefInit failed", $time));
+        $fatal;
       end
 
       // Volatile CSRs