BCM module diagnostics replace timestamp probes: bringup forces EEE off and runs ECD (re-run on every reset, re-baselining past its blip), 1 Hz SNR margin + corrected counters on panel and console; X520 bench divergences bypassed and tracked in open-questions

render.go

@@ -275,6 +275,39 @@ func statusCell(v uint64) string {
 	return paint(s, cRed)
 }
 
+// The worst pair margin across both receivers, in dB above the 10GBASE-T
+// operating point, so nobody has to know the operating point to read it.
+func snrCell(phy phyDisplay) string {
+	if !phy.haveSNR {
+		return paint("-", cGrey)
+	}
+	s := fmt.Sprintf("%+.1f", phy.worstMargin)
+	switch snrClass(phy.worstMargin) {
+	case clsGood:
+		return paint(s, cGreen)
+	case clsWarn:
+		return paint(s, cYellow)
+	default:
+		return paint(s, cRed)
+	}
+}
+
+// Errors the phy absorbed before they could cost a frame: yellow rather than
+// red, the cable being stressed rather than failing.
+func correctedCell(v uint64) string {
+	if v == 0 {
+		return paint("0", cGreen)
+	}
+	return paint(commas(v), cYellow)
+}
+
+func correctedFlag(v uint64) string {
+	if v == 0 {
+		return paint("ok", cGreen)
+	}
+	return paint("warn", cYellow)
+}
+
 // Per-interval rates jitter by a couple of percent at line rate, so green has
 // to cover that. Yellow means a real shortfall, red means badly off.
 const (