ChibiOS 2.6.8, until I can figure out where to get it from git.

firmware/chibios/demos/AVR-ArduinoMega-GCC/main.c

@@ -0,0 +1,61 @@
+/*
+    ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+#include "ch.h"
+#include "hal.h"
+#include "test.h"
+
+static WORKING_AREA(waThread1, 32);
+static msg_t Thread1(void *arg) {
+
+  while (TRUE) {
+    palTogglePad(IOPORT2, PORTB_LED1);
+    chThdSleepMilliseconds(1000);
+  }
+  return 0;
+}
+
+/*
+ * Application entry point.
+ */
+int main(void) {
+
+  /*
+   * System initializations.
+   * - HAL initialization, this also initializes the configured device drivers
+   *   and performs the board-specific initializations.
+   * - Kernel initialization, the main() function becomes a thread and the
+   *   RTOS is active.
+   */
+  halInit();
+  chSysInit();
+
+  /*
+   * Activates the serial driver 1 using the driver default configuration.
+   */
+  palClearPad(IOPORT2, PORTB_LED1);
+  sdStart(&SD1, NULL);
+
+  /*
+   * Starts the LED blinker thread.
+   */
+  chThdCreateStatic(waThread1, sizeof(waThread1), NORMALPRIO, Thread1, NULL);
+
+  TestThread(&SD1);
+  while(TRUE) {
+    chThdSleepMilliseconds(1000);
+  }
+}