diff --git a/tools/rpi_debug.sh b/tools/rpi_debug.sh
new file mode 100755
index 0000000..12d6b7c
--- /dev/null
+++ b/tools/rpi_debug.sh
@@ -0,0 +1,15 @@
+#!/bin/bash
+
+if [[ $# -ne 1 ]]; then
+  echo "usage: $0 <on|off>"
+  exit 1
+fi
+
+debug="0"
+[[ "$1" != "on" ]] || debug=0xFFFFFF
+
+set -x
+
+for module in /sys/module/bcm2835_*; do
+  echo $debug | tee $module/parameters/debug
+done