diff --git a/bba/main.cc b/bba/main.cc
new file mode 100644
index 00000000..42b79504
--- /dev/null
+++ b/bba/main.cc
@@ -0,0 +1,15 @@
+#include <unistd.h>
+#include <assert.h>
+int main()
+{
+    char buffer[512];
+    int i, j;
+    while (1) {
+        i = read(0, buffer, 512);
+        if (i == 0) break;
+        assert(i > 0);
+        j = write(1, buffer, i);
+        assert(i == j);
+    }
+    return 0;
+}
diff --git a/common/nextpnr.h b/common/nextpnr.h
index 021772fe..3ba4f3b3 100644
--- a/common/nextpnr.h
+++ b/common/nextpnr.h
@@ -147,6 +147,7 @@ struct GraphicElement
     {
         G_NONE,
         G_LINE,
+        G_ARROW,
         G_BOX,
         G_CIRCLE,
         G_LABEL
diff --git a/gui/fpgaviewwidget.cc b/gui/fpgaviewwidget.cc
index e21af678..7ccb3445 100644
--- a/gui/fpgaviewwidget.cc
+++ b/gui/fpgaviewwidget.cc
@@ -246,7 +246,7 @@ FPGAViewWidget::FPGAViewWidget(QWidget *parent)
 {
     colors_.background = QColor("#000000");
     colors_.grid = QColor("#333");
-    colors_.frame = QColor("#d0d0d0");
+    colors_.frame = QColor("#808080");
     colors_.hidden = QColor("#606060");
     colors_.inactive = QColor("#303030");
     colors_.active = QColor("#f0f0f0");
@@ -327,7 +327,7 @@ void FPGAViewWidget::drawDecal(LineShaderData &out, const DecalXY &decal)
             line.build(out);
         }
 
-        if (el.type == GraphicElement::G_LINE) {
+        if (el.type == GraphicElement::G_LINE || el.type == GraphicElement::G_ARROW) {
             PolyLine(offsetX + scale * el.x1, offsetY + scale * el.y1, offsetX + scale * el.x2, offsetY + scale * el.y2)
                     .build(out);
         }
@@ -360,7 +360,7 @@ void FPGAViewWidget::drawDecal(LineShaderData out[], const DecalXY &decal)
             }
         }
 
-        if (el.type == GraphicElement::G_LINE) {
+        if (el.type == GraphicElement::G_LINE || el.type == GraphicElement::G_ARROW) {
             auto line = PolyLine(offsetX + scale * el.x1, offsetY + scale * el.y1, offsetX + scale * el.x2,
                                  offsetY + scale * el.y2);
             switch (el.style) {
diff --git a/ice40/gfx.cc b/ice40/gfx.cc
index f6ed789f..1b01cbd8 100644
--- a/ice40/gfx.cc
+++ b/ice40/gfx.cc
@@ -647,7 +647,7 @@ void pipGfx(std::vector<GraphicElement> &g, int x, int y, float x1, float y1, fl
     float ty = 0.5 * (y1 + y2);
 
     GraphicElement el;
-    el.type = GraphicElement::G_LINE;
+    el.type = GraphicElement::G_ARROW;
     el.style = style;
 
     if (fabsf(x1 - swx1) < 0.001 && fabsf(x2 - swx1) < 0.001) {