diff --git a/core/dev/cc2420.c b/backyard/core/dev/cc2420.c
similarity index 99%
rename from core/dev/cc2420.c
rename to backyard/core/dev/cc2420.c
index 9caae1385..d5726fe8b 100644
--- a/core/dev/cc2420.c
+++ b/backyard/core/dev/cc2420.c
@@ -28,7 +28,7 @@
  *
  * This file is part of the Contiki operating system.
  *
- * @(#)$Id: cc2420.c,v 1.21 2007/07/30 14:54:49 bg- Exp $
+ * @(#)$Id: cc2420.c,v 1.1 2008/02/24 22:29:08 adamdunkels Exp $
  */
 /*
  * This code is almost device independent and should be easy to port.
diff --git a/backyard/core/dev/cc2420.h b/backyard/core/dev/cc2420.h
new file mode 100644
index 000000000..143a6063f
--- /dev/null
+++ b/backyard/core/dev/cc2420.h
@@ -0,0 +1,144 @@
+/*
+ * Copyright (c) 2005, Swedish Institute of Computer Science
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the Contiki operating system.
+ *
+ * @(#)$Id: cc2420.h,v 1.1 2008/02/24 22:29:08 adamdunkels Exp $
+ */
+
+#ifndef CC2420_H
+#define CC2420_H
+
+#define MAX_PACKET_LEN      127
+#define ACK_PACKET_LEN        5
+
+/*  fc0 */
+#define FC0_TYPE_MASK       0x07 /* bit0-2 */
+#define FC0_TYPE_BEACON     0x00 /* bit0-2 */
+#define FC0_TYPE_DATA       0x01 /* bit0-2 */
+#define FC0_TYPE_ACK        0x02 /* bit0-2 */
+#define FC0_TYPE_MAC_CMD    0x03 /* bit0-2 */
+/*      reserved            0x04-0x07 */
+
+#define FC0_SECURE          0x08 /* bit3 */
+#define FC0_PENDING         0x10 /* bit4 */
+#define FC0_REQ_ACK         0x20 /* bit5 */
+#define FC0_INTRA_PAN       0x40 /* bit6 */
+/*      reserved            0x80    bit7 */
+
+/* fc1 */
+/*      reserved            0x80    bit8-9 */
+#define FC1_DST_MASK        0x0c /* bit10-11 */
+#define FC1_DST_0           0x00 /* bit10-11 */
+#define FC1_DST_16          0x08 /* bit10-11 */
+#define FC1_DST_64          0x0c /* bit10-11 */
+
+/*      reserved            0x80    bit12-13 */
+#define FC1_SRC_MASK        0xc0 /* bit14-15 */
+#define FC1_SRC_0           0x00 /* bit14-15 */
+#define FC1_SRC_16          0x80 /* bit14-15 */
+#define FC1_SRC_64          0xc0 /* bit14-15 */
+
+/* footer[0] == RSSI, footer[1] == ... */
+#define FOOTER1_CRC_OK      0x80
+#define FOOTER1_CORRELATION 0x7f
+
+/* The hdr_802_15::len byte does not count!!! */
+#define MAC_HDR_LEN   (2 + 1 + 2 + 2 + 2)
+
+struct hdr_802_15 {
+  u8_t len;			/* Not part of MAC header!!! */
+  u8_t fc0;
+  u8_t fc1;
+  u8_t seq;
+  u16_t dst_pan;		/* also u8_t ack_footer[2] */
+  u16_t dst;
+  /* optional src_pan */
+  u16_t src;
+  /* u8_t payload[uip_len] */
+  /* u8_t footer[2] */
+  /* no more */
+};
+
+struct hdr_802_15_ack {
+  u8_t len;
+  u8_t fc0;
+  u8_t fc1;
+  u8_t seq;
+  u8_t footer[2];
+  /* no more */
+};
+
+struct cc2420_neigbour {
+  unsigned mac:16, nretrans:4, expire:4; /* expiration time */
+#if 0
+  unsigned rssi:6, correlation:6;
+#endif
+};
+
+#define NNEIGBOURS 16
+extern struct cc2420_neigbour neigbours[NNEIGBOURS];
+
+PROCESS_NAME(cc2420_process);
+
+extern struct uip_fw_netif cc2420if;
+
+extern signed char cc2420_last_rssi;
+extern u8_t cc2420_last_correlation;
+extern u8_t cc2420_is_input;
+extern volatile u8_t cc2420_ack_received;
+
+void cc2420_init(void);
+void cc2420_set_chan_pan_addr(unsigned channel, unsigned pan,
+			      unsigned addr, const u8_t *ieee_addr);
+void cc2420_on(void);
+void cc2420_off(void);
+
+u8_t cc2420_send_ip(void);
+u8_t cc2420_send_uaodv(void);
+int  cc2420_send(struct hdr_802_15 *hdr, u8_t hdr_len,
+		 const u8_t *p, u8_t p_len);
+
+/* Called at poll priority. */
+void cc2420_input(const struct hdr_802_15 *hdr, u8_t hdr_len,
+		  const u8_t *payload, u8_t payload_len);
+
+/* Is mac far away? remote=1, local=0, don't know=-1. */
+enum { REMOTE_MAYBE = -1, REMOTE_NO = 0, REMOTE_YES = 1 };
+int cc2420_check_remote(u16_t mac);
+void cc2420_recv_ok(uip_ipaddr_t *from);
+
+/*
+ * Machine dependent initialization function and an interrupt service
+ * routine must be provided externally. Call cc2420_intr from the
+ * interrupt service routine.
+ */
+void __cc2420_arch_init(void);
+int  __cc2420_intr(void);
+
+#endif /* CC2420_H */