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-main.c

@@ -0,0 +1,152 @@
+/*
+ * 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.
+ *
+ * @(#)$$
+ */
+
+/**
+ * \file
+ *         Sample Contiki kernel for STK 501 development board
+ *
+ * \author
+ *         Simon Barner <barner@in.tum.de
+ */
+
+#include <avr/pgmspace.h>
+#include <stdio.h>
+
+#include "contiki-stk501.h"
+#include "cfs/cfs-eeprom.h"
+#include "lib/mmem.h"
+#include "loader/symbols-def.h"
+#include "loader/symtab.h"
+#include "codeprop.h"
+#include "sys/mt.h"
+
+/* Uncomment to enable demonstration of multi-threading libary */
+/* #define MT_DEMO */
+
+PROCINIT(&etimer_process, &tcpip_process, &uip_fw_process, &cfs_eeprom_process);
+
+#ifdef MT_DEMO
+static struct mt_thread threads[3];
+
+static
+void thread_handler1 (void* data) {
+  while (1) {
+    rs232_print_p (RS232_PORT_1, PSTR ("Thread 1. Data: ") );
+    rs232_printf (RS232_PORT_1, "0x%x, %d\n", data, *(uint8_t*)data );
+    mt_yield ();
+  }
+}
+
+static
+void thread_handler2 (void* data) {
+  while (1) {
+    rs232_print_p (RS232_PORT_1, PSTR ("Thread 2. Data: "));
+    rs232_printf (RS232_PORT_1, "0x%x, %d\n", data, *(uint8_t*)data );
+    mt_yield ();
+  }
+}
+#endif
+
+PROCESS(contiki_stk501_main_init_process, "Contiki STK501 init process");
+PROCESS_THREAD(contiki_stk501_main_init_process, ev, data)
+{
+  PROCESS_BEGIN();
+
+  /* Network support (uIP) */
+  init_net();
+
+  /* Initalize heap allocator */
+  mmem_init ();
+
+  /* Code propagator */
+  process_start(&codeprop_process, NULL);
+
+  /* Multi-threading support */
+#ifdef MT_DEMO
+  mt_init ();
+#endif
+
+  PROCESS_END();
+}
+
+#ifdef MT_DEMO
+static uint8_t d1=1, d2=2, d3=3;
+#endif
+
+int
+main(void)
+{
+  /*
+   * GCC depends on register r1 set to 0.
+   */
+  asm volatile ("clr r1");
+
+  /* Initialize hardware */
+  init_lowlevel();
+
+  /* Clock */
+  clock_init();
+
+  /* Process subsystem */
+  process_init();
+
+  /* Register initial processes */
+  procinit_init();
+
+  /* Perform rest of initializations */
+  process_start(&contiki_stk501_main_init_process, NULL);
+
+  rs232_print_p (RS232_PORT_1, PSTR ("Initialized.\n"));
+
+#ifdef MT_DEMO
+  mt_start (&threads[0], thread_handler1, &d1);
+  mt_start (&threads[1], thread_handler2, &d2);
+  mt_start (&threads[2], thread_handler2, &d3);
+
+  uint8_t i;
+#endif
+
+  /* Main scheduler loop */
+  while(1) {
+
+    process_run();
+
+#ifdef MT_DEMO
+    for (i=0; i<3; ++i) {
+      mt_exec (&threads[i]);
+    }
+#endif
+  }
+
+  return 0;
+}