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diff --git a/bertos/cpu/avr/drv/ser_xmega.h b/bertos/cpu/avr/drv/ser_xmega.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 2007, 2010 Develer S.r.l. (http://www.develer.com/)
+ * Copyright 2011 Onno <developer@gorgoz.org>
+ * -->
+ *
+ *
+ * \brief Low-level serial module for AVR XMEGA (interface).
+ *
+ * This file is heavily inspired by the AVR implementation for BeRTOS,
+ * but uses a different approach for implementing the different debug
+ * ports, by using the USART_t structs.
+ *
+ * \author Onno <developer@gorgoz.org>
+ *
+ */
+
+#ifndef DRV_SER_XMEGA_H
+#define DRV_SER_XMEGA_H
+
+#include <cfg/macros.h>   /* BV() */
+#include <cfg/compiler.h> /* uint8_t */
+
+typedef uint8_t serstatus_t;
+
+/* Software errors */
+#define SERRF_RXFIFOOVERRUN  BV(0)  /**< Rx FIFO buffer overrun */
+#define SERRF_RXTIMEOUT      BV(5)  /**< Receive timeout */
+#define SERRF_TXTIMEOUT      BV(6)  /**< Transmit timeout */
+
+/*
+* Hardware errors.
+* These flags map directly to the AVR XMEGA UART Status Register.
+*/
+#define SERRF_RXSROVERRUN    BV(3)  /**< Rx shift register overrun */
+#define SERRF_FRAMEERROR     BV(4)  /**< Stop bit missing */
+#define SERRF_PARITYERROR    BV(2)  /**< Parity error */
+#define SERRF_NOISEERROR     0      /**< Unsupported */
+
+/*
+ * \name Serial hw numbers
+ *
+ * \{
+ */
+enum
+{
+	SER_UART0,
+	SER_UART1,
+#ifdef CPU_AVR_XMEGA_A
+	//the XMEGA A Family have 5 USART ports
+	SER_UART2,
+	SER_UART3,
+	SER_UART4,
+#endif
+	SER_CNT  /**< Number of serial ports */
+};
+/*\}*/
+
+#endif /* DRV_SER_XMEGA_H */