Add new plattform definition for the STK 501 board featuring an

Atmel ATmega128.

Very brief instructions:

- Configure your programmer etc. in Makefile.stk501
- Use 'make upload' to flash your STK501.
- Setup a SLIP connection to your board (on the first serial port)
  and make sure you can ping it.
- Use 'make loadable_prg.ko' to build a demo module.
- gcc -ocodeprop ../../tools/codeprop.c
- ./codeprop <IP of STK> loadable_prg.ko
- Watch the module print "Tick, Tack, Tick, ..." on the second
  serial port.

platform/stk501/contiki-stk501-default-init-net.c

@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2006, Technical University of Munich
+ * 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.
+ *
+ * Author: Simon Barner <barner@in.tum.de>
+ *
+ * @(#)$$
+ */
+
+#include "contiki-stk501.h"
+
+static struct uip_fw_netif slipif =
+  {UIP_FW_NETIF(10,100,0,0, 255,255,0,0, slip_send)};
+
+void
+init_net(void)
+{
+  uip_ipaddr_t hostaddr;
+
+  rs232_set_input (SLIP_PORT, slip_input_byte); 
+  process_start(&slip_process, NULL);
+
+  uip_ipaddr(&hostaddr, 10, 100, 0, 2);
+  uip_sethostaddr(&hostaddr);
+
+  uip_fw_register(&slipif);
+  // uip_fw_default(&slipif);
+}