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diff --git a/nuttx/arch/avr/src/at90usb/at90usb_serial.c b/nuttx/arch/avr/src/at90usb/at90usb_serial.c
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+/****************************************************************************
+ * arch/avr/src/at90usb/at90usb_serial.c
+ *
+ * Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ * Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * 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 NuttX 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 COPYRIGHT HOLDERS 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
+ * COPYRIGHT OWNER 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include "at90usb_config.h"
+
+#include <sys/types.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <semaphore.h>
+#include <string.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/irq.h>
+#include <nuttx/arch.h>
+#include <nuttx/serial.h>
+
+#include <arch/board/board.h>
+
+#include "up_arch.h"
+#include "up_internal.h"
+#include "os_internal.h"
+#include "at90usb_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/* Some sanity checks *******************************************************/
+
+/* Is there at least one USART enabled and configured as a RS-232 device? */
+
+#ifndef HAVE_USART_DEVICE
+# warning "No USARTs enabled as RS-232 devices"
+#endif
+
+/* If we are not using the serial driver for the console, then we still must
+ * provide some minimal implementation of up_putc.
+ */
+
+#ifdef CONFIG_USE_SERIALDRIVER
+
+/* Which USART with be tty0/console and which tty1? */
+
+#if defined(CONFIG_USART1_SERIAL_CONSOLE)
+# define CONSOLE_DEV g_usart1port /* USART1 is console */
+# define TTYS0_DEV g_usart1port /* USART1 is ttyS0 */
+#endif
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+struct up_dev_s
+{
+ uintptr_t usartbase; /* Base address of USART registers */
+ uint32_t baud; /* Configured baud */
+ uint32_t csr; /* Saved channel status register contents */
+ uint8_t irq; /* IRQ associated with this USART */
+ uint8_t parity; /* 0=none, 1=odd, 2=even */
+ uint8_t bits; /* Number of bits (5, 6, 7 or 8) */
+ bool stopbits2; /* true: Configure with 2 stop bits instead of 1 */
+};
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+static int up_setup(struct uart_dev_s *dev);
+static void up_shutdown(struct uart_dev_s *dev);
+static int up_attach(struct uart_dev_s *dev);
+static void up_detach(struct uart_dev_s *dev);
+static int up_interrupt(int irq, void *context);
+static int up_ioctl(struct file *filep, int cmd, unsigned long arg);
+static int up_receive(struct uart_dev_s *dev, uint32_t *status);
+static void up_rxint(struct uart_dev_s *dev, bool enable);
+static bool up_rxavailable(struct uart_dev_s *dev);
+static void up_send(struct uart_dev_s *dev, int ch);
+static void up_txint(struct uart_dev_s *dev, bool enable);
+static bool up_txready(struct uart_dev_s *dev);
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+struct uart_ops_s g_uart_ops =
+{
+ .setup = up_setup,
+ .shutdown = up_shutdown,
+ .attach = up_attach,
+ .detach = up_detach,
+ .ioctl = up_ioctl,
+ .receive = up_receive,
+ .rxint = up_rxint,
+ .rxavailable = up_rxavailable,
+ .send = up_send,
+ .txint = up_txint,
+ .txready = up_txready,
+ .txempty = up_txready,
+};
+
+/* I/O buffers */
+
+#ifdef CONFIG_AVR_USART1_RS232
+static char g_usart1rxbuffer[CONFIG_USART1_RXBUFSIZE];
+static char g_usart1txbuffer[CONFIG_USART1_TXBUFSIZE];
+#endif
+
+/* This describes the state of the AVR32 USART1 port. */
+
+#ifdef CONFIG_AVR_USART1_RS232
+static struct up_dev_s g_usart1priv =
+{
+ .usartbase = AVR_USART1_BASE,
+ .baud = CONFIG_USART1_BAUD,
+ .irq = AVR_IRQ_USART1,
+ .parity = CONFIG_USART1_PARITY,
+ .bits = CONFIG_USART1_BITS,
+ .stopbits2 = CONFIG_USART1_2STOP,
+};
+
+static uart_dev_t g_usart1port =
+{
+ .recv =
+ {
+ .size = CONFIG_USART1_RXBUFSIZE,
+ .buffer = g_usart1rxbuffer,
+ },
+ .xmit =
+ {
+ .size = CONFIG_USART1_TXBUFSIZE,
+ .buffer = g_usart1txbuffer,
+ },
+ .ops = &g_uart_ops,
+ .priv = &g_usart1priv,
+};
+#endif
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_serialin
+ ****************************************************************************/
+
+static inline uint32_t up_serialin(struct up_dev_s *priv, int offset)
+{
+# warning "Missing logic"
+}
+
+/****************************************************************************
+ * Name: up_serialout
+ ****************************************************************************/
+
+static inline void up_serialout(struct up_dev_s *priv, int offset, uint32_t value)
+{
+# warning "Missing logic"
+}
+
+/****************************************************************************
+ * Name: up_restoreusartint
+ ****************************************************************************/
+
+static void up_restoreusartint(struct up_dev_s *priv, uint32_t imr)
+{
+# warning "Missing logic"
+}
+
+/****************************************************************************
+ * Name: up_disableusartint
+ ****************************************************************************/
+
+static inline void up_disableusartint(struct up_dev_s *priv, uint32_t *imr)
+{
+# warning "Missing logic"
+}
+
+/****************************************************************************
+ * Name: up_setup
+ *
+ * Description:
+ * Configure the USART baud, bits, parity, etc. This method is called the
+ * first time that the serial port is opened.
+ *
+ ****************************************************************************/
+
+static int up_setup(struct uart_dev_s *dev)
+{
+#ifndef CONFIG_SUPPRESS_UART_CONFIG
+ struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
+
+ /* Configure the USART as an RS-232 UART */
+
+ usart_configure(priv->usartbase, priv->baud, priv->parity,
+ priv->bits, priv->stopbits2);
+#endif
+
+ return OK;
+}
+
+/****************************************************************************
+ * Name: up_shutdown
+ *
+ * Description:
+ * Disable the USART. This method is called when the serial
+ * port is closed
+ *
+ ****************************************************************************/
+
+static void up_shutdown(struct uart_dev_s *dev)
+{
+ struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
+
+ /* Reset, disable interrupts, and disable Rx and Tx */
+
+ usart_reset(priv->usartbase);
+}
+
+/****************************************************************************
+ * Name: up_attach
+ *
+ * Description:
+ * Configure the USART to operation in interrupt driven mode. This method is
+ * called when the serial port is opened. Normally, this is just after the
+ * the setup() method is called, however, the serial console may operate in
+ * a non-interrupt driven mode during the boot phase.
+ *
+ * RX and TX interrupts are not enabled when by the attach method (unless the
+ * hardware supports multiple levels of interrupt enabling). The RX and TX
+ * interrupts are not enabled until the txint() and rxint() methods are called.
+ *
+ ****************************************************************************/
+
+static int up_attach(struct uart_dev_s *dev)
+{
+ struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
+
+ /* Attach the IRQ */
+
+ return irq_attach(priv->irq, up_interrupt);
+}
+
+/****************************************************************************
+ * Name: up_detach
+ *
+ * Description:
+ * Detach USART interrupts. This method is called when the serial port is
+ * closed normally just before the shutdown method is called. The exception
+ * is the serial console which is never shutdown.
+ *
+ ****************************************************************************/
+
+static void up_detach(struct uart_dev_s *dev)
+{
+ struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
+# warning "Missing logic"
+ irq_detach(priv->irq);
+}
+
+/****************************************************************************
+ * Name: up_interrupt
+ *
+ * Description:
+ * This is the USART interrupt handler. It will be invoked when an
+ * interrupt received on the 'irq' It should call uart_transmitchars or
+ * uart_receivechar to perform the appropriate data transfers. The
+ * interrupt handling logic must be able to map the 'irq' number into the
+ * approprite uart_dev_s structure in order to call these functions.
+ *
+ ****************************************************************************/
+
+static int up_interrupt(int irq, void *context)
+{
+ struct uart_dev_s *dev = NULL;
+ struct up_dev_s *priv;
+ uint32_t csr;
+ int passes;
+ bool handled;
+
+#ifdef CONFIG_AVR_USART1_RS232
+ if (g_usart1priv.irq == irq)
+ {
+ dev = &g_usart1port;
+ }
+ else
+#endif
+ {
+ PANIC(OSERR_INTERNAL);
+ }
+ priv = (struct up_dev_s*)dev->priv;
+ DEBUGASSERT(priv);
+
+ /* Loop until there are no characters to be transferred or,
+ * until we have been looping for a long time.
+ */
+
+ handled = true;
+ for (passes = 0; passes < 256 && handled; passes++)
+ {
+ handled = false;
+
+# warning "Missing logic"
+ /* Handle incoming, receive bytes (with or without timeout) */
+
+# warning "Missing logic"
+ {
+ /* Received data ready... process incoming bytes */
+
+ uart_recvchars(dev);
+ handled = true;
+ }
+
+ /* Handle outgoing, transmit bytes */
+
+# warning "Missing logic"
+ {
+ /* Transmit data regiser empty ... process outgoing bytes */
+
+ uart_xmitchars(dev);
+ handled = true;
+ }
+ }
+ return OK;
+}
+
+/****************************************************************************
+ * Name: up_ioctl
+ *
+ * Description:
+ * All ioctl calls will be routed through this method
+ *
+ ****************************************************************************/
+
+static int up_ioctl(struct file *filep, int cmd, unsigned long arg)
+{
+#if 0 /* Reserved for future growth */
+ struct inode *inode;
+ struct uart_dev_s *dev;
+ struct up_dev_s *priv;
+ int ret = OK;
+
+ DEBUGASSERT(filep, filep->f_inode);
+ inode = filep->f_inode;
+ dev = inode->i_private;
+
+ DEBUGASSERT(dev, dev->priv)
+ priv = (struct up_dev_s*)dev->priv;
+
+ switch (cmd)
+ {
+ case xxx: /* Add commands here */
+ break;
+
+ default:
+ ret = -ENOTTY;
+ break;
+ }
+
+ return ret;
+#else
+ return -ENOTTY;
+#endif
+}
+
+/****************************************************************************
+ * Name: up_receive
+ *
+ * Description:
+ * Called (usually) from the interrupt level to receive one
+ * character from the USART. Error bits associated with the
+ * receipt are provided in the return 'status'.
+ *
+ ****************************************************************************/
+
+static int up_receive(struct uart_dev_s *dev, uint32_t *status)
+{
+ struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
+
+ /* Get the Rx byte. The USART Rx interrupt flag is cleared by side effect
+ * when reading the received character.
+ */
+
+# warning "Missing logic"
+
+ /* Return status information */
+
+ if (status)
+ {
+# warning "Missing logic"
+ }
+
+ /* Then return the actual received byte */
+
+# warning "Missing logic"
+ return 0;
+}
+
+/****************************************************************************
+ * Name: up_rxint
+ *
+ * Description:
+ * Call to enable or disable RX interrupts
+ *
+ ****************************************************************************/
+
+static void up_rxint(struct uart_dev_s *dev, bool enable)
+{
+ struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
+
+ if (enable)
+ {
+ /* Receive an interrupt when their is anything in the Rx data register (or an Rx
+ * timeout occurs).
+ */
+
+#ifndef CONFIG_SUPPRESS_SERIAL_INTS
+# warning "Missing logic"
+#endif
+ }
+ else
+ {
+# warning "Missing logic"
+ }
+}
+
+/****************************************************************************
+ * Name: up_rxavailable
+ *
+ * Description:
+ * Return true if the receive register is not empty
+ *
+ ****************************************************************************/
+
+static bool up_rxavailable(struct uart_dev_s *dev)
+{
+ struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
+# warning "Missing logic"
+ return 0;
+}
+
+/****************************************************************************
+ * Name: up_send
+ *
+ * Description:
+ * This method will send one byte on the USART.
+ *
+ ****************************************************************************/
+
+static void up_send(struct uart_dev_s *dev, int ch)
+{
+ struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
+# warning "Missing logic"
+ return 0;
+}
+
+/****************************************************************************
+ * Name: up_txint
+ *
+ * Description:
+ * Call to enable or disable TX interrupts
+ *
+ ****************************************************************************/
+
+static void up_txint(struct uart_dev_s *dev, bool enable)
+{
+ struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
+ irqstate_t flags;
+
+ flags = irqsave();
+ if (enable)
+ {
+ /* Set to receive an interrupt when the TX data register is empty */
+
+#ifndef CONFIG_SUPPRESS_SERIAL_INTS
+# warning "Missing logic"
+
+ /* Fake a TX interrupt here by just calling uart_xmitchars() with
+ * interrupts disabled (note this may recurse).
+ */
+
+ uart_xmitchars(dev);
+#endif
+ }
+ else
+ {
+ /* Disable the TX interrupt */
+
+# warning "Missing logic"
+ }
+ irqrestore(flags);
+}
+
+/****************************************************************************
+ * Name: up_txready
+ *
+ * Description:
+ * Return true if the tranmsit data register is empty
+ *
+ ****************************************************************************/
+
+static bool up_txready(struct uart_dev_s *dev)
+{
+ struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
+# warning "Missing logic"
+ return 0;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_earlyserialinit
+ *
+ * Description:
+ * Performs the low level USART initialization early in debug so that the
+ * serial console will be available during bootup. This must be called
+ * before up_serialinit. NOTE: This function depends on GPIO pin
+ * configuration performed in up_consoleinit() and main clock iniialization
+ * performed in up_clkinitialize().
+ *
+ ****************************************************************************/
+
+void up_earlyserialinit(void)
+{
+ /* Disable all USARTS */
+
+ up_disableusartint(TTYS0_DEV.priv, NULL);
+#ifdef TTYS1_DEV
+ up_disableusartint(TTYS1_DEV.priv, NULL);
+#endif
+
+ /* Configuration whichever one is the console */
+
+#ifdef HAVE_SERIAL_CONSOLE
+ CONSOLE_DEV.isconsole = true;
+ up_setup(&CONSOLE_DEV);
+#endif
+}
+
+/****************************************************************************
+ * Name: up_serialinit
+ *
+ * Description:
+ * Register serial console and serial ports. This assumes
+ * that up_earlyserialinit was called previously.
+ *
+ ****************************************************************************/
+
+void up_serialinit(void)
+{
+ /* Register the console */
+
+#ifdef HAVE_SERIAL_CONSOLE
+ (void)uart_register("/dev/console", &CONSOLE_DEV);
+#endif
+
+ /* Register all USARTs */
+
+ (void)uart_register("/dev/ttyS0", &TTYS0_DEV);
+#ifdef TTYS1_DEV
+ (void)uart_register("/dev/ttyS1", &TTYS1_DEV);
+#endif
+}
+
+/****************************************************************************
+ * Name: up_putc
+ *
+ * Description:
+ * Provide priority, low-level access to support OS debug writes
+ *
+ ****************************************************************************/
+
+int up_putc(int ch)
+{
+#ifdef HAVE_SERIAL_CONSOLE
+ struct up_dev_s *priv = (struct up_dev_s*)CONSOLE_DEV.priv;
+ uint32_t imr;
+
+ up_disableusartint(priv, &imr);
+
+ /* Check for LF */
+
+ if (ch == '\n')
+ {
+ /* Add CR */
+
+ up_lowputc('\r');
+ }
+
+ up_lowputc(ch);
+ up_restoreusartint(priv, imr);
+#endif
+ return ch;
+}
+
+#else /* CONFIG_USE_SERIALDRIVER */
+
+/****************************************************************************
+ * Name: up_putc
+ *
+ * Description:
+ * Provide priority, low-level access to support OS debug writes
+ *
+ ****************************************************************************/
+
+int up_putc(int ch)
+{
+#ifdef HAVE_SERIAL_CONSOLE
+ /* Check for LF */
+
+ if (ch == '\n')
+ {
+ /* Add CR */
+
+ up_lowputc('\r');
+ }
+
+ up_lowputc(ch);
+#endif
+ return ch;
+}
+
+#endif /* CONFIG_USE_SERIALDRIVER */
+
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