diff -r a560a124a92e -r 5868944a6456 master/ioctl.h
--- a/master/ioctl.h	Mon Jun 09 10:31:05 2008 +0000
+++ b/master/ioctl.h	Mon Jun 09 12:11:19 2008 +0000
@@ -66,6 +66,7 @@
 #define EC_IOCTL_SDO          EC_IOWR(0x0b, ec_ioctl_sdo_t)
 #define EC_IOCTL_SDO_ENTRY    EC_IOWR(0x0c, ec_ioctl_sdo_entry_t)
 #define EC_IOCTL_SDO_UPLOAD   EC_IOWR(0x0d, ec_ioctl_sdo_upload_t)
+#define EC_IOCTL_SDO_DOWNLOAD  EC_IOW(0x0e, ec_ioctl_sdo_download_t)
 
 /*****************************************************************************/
 
@@ -244,4 +245,15 @@
 
 /*****************************************************************************/
 
+typedef struct {
+    // inputs
+    uint16_t slave_position;
+    uint16_t sdo_index;
+    uint8_t sdo_entry_subindex;
+    unsigned int data_size;
+    uint8_t *data;
+} ec_ioctl_sdo_download_t;
+
+/*****************************************************************************/
+
 #endif