temporary fix to get sicslowpan.c working on the Sky platform:

conventional MAC implementations require a call to the MAC driver's
read function.

core/net/sicslowpan.c

@@ -32,7 +32,7 @@
  *
  * This file is part of the Contiki operating system.
  *
- * $Id: sicslowpan.c,v 1.3 2008/10/14 13:39:12 julienabeille Exp $
+ * $Id: sicslowpan.c,v 1.4 2008/11/06 20:45:06 nvt-se Exp $
  */
 /**
  * \file
@@ -1209,6 +1209,12 @@ input(const struct mac_driver *r)
   u16_t frag_tag = 0;
 #endif /*SICSLOWPAN_CONF_FRAG*/
 
+#ifdef SICSLOWPAN_CONF_CONVENTIONAL_MAC
+  if(r->read() <= 0) {
+    return;
+  }
+#endif /* SICSLOWPAN_CONF_CONVENTIONAL_MAC */
+
   /* init */
   uncomp_hdr_len = 0;
   rime_hdr_len = 0;