Index: firmware/target/arm/usb-s3c6400x.c
===================================================================
--- firmware/target/arm/usb-s3c6400x.c	(revision 24144)
+++ firmware/target/arm/usb-s3c6400x.c	(working copy)
@@ -51,6 +51,9 @@
 static struct ep_type endpoints[5];
 static struct usb_ctrlrequest ctrlreq USB_DEVBSS_ATTR;
 
+static unsigned char dummy_data[32] USB_DEVBSS_ATTR;
+
+
 int usb_drv_port_speed(void)
 {
     return (DSTS & 2) == 0 ? 1 : 0;
@@ -271,6 +274,7 @@
 
 void ep_send(int ep, void *ptr, int length)
 {
+    if(ptr==NULL) ptr = dummy_data;
     endpoints[ep].busy = true;
     endpoints[ep].size = length;
     DIEPCTL(ep) |= 0x8000;  /* EPx OUT ACTIVE */
@@ -285,6 +289,7 @@
 
 void ep_recv(int ep, void *ptr, int length)
 {
+    if(ptr==NULL) ptr = dummy_data;
     endpoints[ep].busy = true;
     endpoints[ep].size = length;
     DOEPCTL(ep) &= ~0x20000;  /* EPx UNSTALL */