diff -r e9f722488fcd -r b5391b329b5d master/cdev.c
--- a/master/cdev.c	Mon Oct 25 17:06:45 2010 +0200
+++ b/master/cdev.c	Tue Nov 30 15:24:21 2010 +0100
@@ -1992,6 +1992,25 @@
 
 /*****************************************************************************/
 
+/** Reset configuration.
+ */
+int ec_cdev_ioctl_reset(
+        ec_master_t *master, /**< EtherCAT master. */
+        unsigned long arg, /**< ioctl() argument. */
+        ec_cdev_priv_t *priv /**< Private data structure of file handle. */
+        )
+{
+    if (unlikely(!priv->requested))
+        return -EPERM;
+
+    down(&master->master_sem);
+    ecrt_master_reset(master);
+    up(&master->master_sem);
+    return 0;
+}
+
+/*****************************************************************************/
+
 /** Configure a sync manager.
  */
 int ec_cdev_ioctl_sc_sync(
@@ -3671,6 +3690,10 @@
             if (!(filp->f_mode & FMODE_WRITE))
                 return -EPERM;
             return ec_cdev_ioctl_sync_mon_process(master, arg, priv);
+        case EC_IOCTL_RESET:
+            if (!(filp->f_mode & FMODE_WRITE))
+                return -EPERM;
+            return ec_cdev_ioctl_reset(master, arg, priv);
         case EC_IOCTL_SC_SYNC:
             if (!(filp->f_mode & FMODE_WRITE))
                 return -EPERM;