From 2c3c9f1fbe856f236740dda9827fd8e02653c758 Mon Sep 17 00:00:00 2001
From: Berkus Decker <berkus+github@metta.systems>
Date: Sun, 28 Feb 2021 13:39:15 +0200
Subject: [PATCH] Add SPI SWD from RPi3 manual

---
 doc/rpi4_swd.md | 4 ++++
 1 file changed, 4 insertions(+)
 create mode 100644 doc/rpi4_swd.md

diff --git a/doc/rpi4_swd.md b/doc/rpi4_swd.md
new file mode 100644
index 0000000..ebc5f3f
--- /dev/null
+++ b/doc/rpi4_swd.md
@@ -0,0 +1,4 @@
+# Using RPi4 as SWD bitbanging host
+
+[Use SPI for better reliability](https://lupyuen.github.io/articles/openocd-on-raspberry-pi-better-with-swd-on-spi)
+