From 01f36081fc6fa95e271239262ec9e60e00d3dda5 Mon Sep 17 00:00:00 2001
From: Alexander Couzens <lynxis@fe80.eu>
Date: Thu, 9 Jul 2026 16:08:39 +0200
Subject: [PATCH] README.md: describe the debug uart

Change-Id: I4cf929fded962e7ffb4c01628279385b2af04157
---
 README.md | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/README.md b/README.md
index f258b408..168294f0 100644
--- a/README.md
+++ b/README.md
@@ -52,3 +52,11 @@ with USB pass-through for things with critical timing like SIMtrace2 is
 calling for trouble** and we will not accept related bug reports or
 support you if you do.  If you still want to use VMs: Feel free to do
 so, but understand that it's unsupported and you are on your own.
+
+Debug UART
+----------
+
+The debug UART configuration is 921600 8N1, TTL 3.3V.
+
+On the simtrace 2 use either a 2.5 mm stereo headphone connector (tip = TX, ring = RX, sleeve = GND)
+or the nearby DEBUG port (pin 1 = GND, pin 4 = TX, pin 5 = RX).