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diff --git a/examples/avr-kern/hw/hw_sd.h b/examples/avr-kern/hw/hw_sd.h
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+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2009 Develer S.r.l. (http://www.develer.com/)
+ * All Rights Reserved.
+ * -->
+ *
+ * \brief SD driver hardware-specific definitions.
+ *
+ * \version $Id$
+ *
+ * \author Luca Ottaviano <lottaviano@develer.com>
+ */
+
+#ifndef HW_SD_H
+#define HW_SD_H
+
+#warning FIXME: This is an example implementation, you must implement it
+
+#define SD_CS_INIT() do { /* implement me */} while(0)
+#define SD_CS_ON()   do { /* implement me */} while(0)
+#define SD_CS_OFF()  do { /* implement me */} while(0)
+
+#define SD_PIN_INIT()      do { /* implement me */} while(0)
+#define SD_CARD_PRESENT()  true /* implement me */
+#define SD_WRITE_PROTECT() false /* implement me */
+
+#endif /* HW_SD_H */