diff --git a/fw/common/config.h b/fw/common/config.h
index 3c384e4..a55e2ff 100644
--- a/fw/common/config.h
+++ b/fw/common/config.h
@@ -1,6 +1,22 @@
+/*
+ * common/config.h - Configuration data for boot loader and application
+ *
+ * Written 2010 by Werner Almesberger
+ * Copyright 2010 Werner Almesberger
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
 #ifndef CONFIG_H
 #define CONFIG_H
 
+#include "io.h"
+#include "io-parts.h"
+
+
 /*
  *  Platform-specific settings
  *
@@ -12,6 +28,28 @@
 #define	USB_VENDOR	0x20b7
 #define	USB_PRODUCT	0x1540
 
+
+/* ----- Boot loader configuration ----------------------------------------- */
+
+/*
+ * Make LED output push-pull so that we can output a high voltage.
+ * This turns on the LED, to indicate that we're in the boot loader.
+ */
+
+#define PLATFORM_SETUP \
+	LED_MODE |= 1 << LED_BIT;
+
+
+/*
+ * Turn off the LED when we exit the boot loader.
+ */
+
+#define PLATFORM_EXIT \
+	LED = 0
+
+
+/* ----- Application configuration ----------------------------------------- */
+
 #define	HW_TYPE		HW_TYPE_100813
 
 #endif /* !CONFIG_H */
diff --git a/fw/common/io.h b/fw/common/io.h
index df912aa..53604ce 100644
--- a/fw/common/io.h
+++ b/fw/common/io.h
@@ -1,5 +1,5 @@
 /*
- * atspi/io.h - I/O pin assignment
+ * common/io.h - I/O pin assignment
  *
  * Written 2010 by Werner Almesberger
  * Copyright 2010 Werner Almesberger