diff --git a/dataflow_neuro/chips.act b/dataflow_neuro/chips.act
index c2e87c3..9fa23f0 100644
--- a/dataflow_neuro/chips.act
+++ b/dataflow_neuro/chips.act
@@ -166,23 +166,26 @@ defproc chip_texel (bd<N_IN> in, out;
     // Otherwise boom.
     bool DEV_DEBUG;
     pint NSMX4 = N_SYN_MON_X/4; // Self explanatory
-    sigbuf<NSMX4> sb_DEV_DEBUG(.in = register.data[0].d[5].t,
+    sigbuf<std::max(NSMX4,4)> sb_DEV_DEBUG(.in = register.data[0].d[5].t,
         .supply = supply);
     DEV_DEBUG = sb_DEV_DEBUG.out[0];
-    AND2_X1 ands_devmon[NSMX4];
-    (i:NSMX4:
-        ands_devmon[i].a = syn_mon_dec_x.out[1+i*4];
-        ands_devmon[i].b = DEV_DEBUG;
-        ands_devmon[i].y = syn_mon_x[1+i*4];
-        ands_devmon[i].vdd = supply.vdd;
-        ands_devmon[i].vss = supply.vss;
-    )
-    // Wire up the non-ANDed lines.
-    (i:N_SYN_MON_X:
-        [~(i%4 = 1) ->
-            syn_mon_x[i] = syn_mon_dec_x.out[i];
-        ]
-    )
+    [NSMX4 >= 1 ->
+        AND2_X1 ands_devmon[NSMX4];
+        (i:NSMX4:
+            ands_devmon[i].a = syn_mon_dec_x.out[1+i*4];
+            ands_devmon[i].b = DEV_DEBUG;
+            ands_devmon[i].y = syn_mon_x[1+i*4];
+            ands_devmon[i].vdd = supply.vdd;
+            ands_devmon[i].vss = supply.vss;
+        )
+        // Wire up the non-ANDed lines.
+        (i:N_SYN_MON_X:
+            [~(i%4 = 1) ->
+                syn_mon_x[i] = syn_mon_dec_x.out[i];
+            ]
+        )
+    ]
+    
 
 
 }
diff --git a/test/prsim_plot.py b/test/prsim_plot.py
index a71f19b..14bf3e1 100755
--- a/test/prsim_plot.py
+++ b/test/prsim_plot.py
@@ -99,6 +99,14 @@ Use -exclude='regex' to specify signals to exclude (or -ex).""")
 		if len(r) >= 1:
 			include_all_times = True
 
+
+	# Check if user gave "nowarn" flag
+	plot_warn = True
+	for arg in argv:
+		r = re.findall(r'(-nowarn?)', arg)
+		if len(r) >= 1:
+			plot_warn = False
+
 	# Get list of all times (before filtering)
 	unique_times = np.unique([int(e[0]) for e in entries])
 
@@ -237,8 +245,9 @@ Use -exclude='regex' to specify signals to exclude (or -ex).""")
 				print(f"Couldn't find an appropriate time for warning {a}")
 				continue
 		index = time_to_index(time)
-		ax.axvline(index+0.5, c = "red", lw = 2)
-		ax.text(index+0.5, -1, a[2], rotation = 90, ha = "center", va = "bottom", c = "red")
+		if plot_warn:
+			ax.axvline(index+0.5, c = "red", lw = 2)
+			ax.text(index+0.5, -1, a[2], rotation = 90, ha = "center", va = "bottom", c = "red")
 
 	# Find echoed statements of the form "[digits] text"
 	echoes = re.findall(r"\t *(\d+) [^\t]*\n(\[\d*\].+)", f)