edb7xxx_serial_info *edb7xxx_chan = (edb7xxx_serial_info *)chan->dev_priv;    volatile cyg_uint32 *syscon = (volatile cyg_uint32 *)edb7xxx_chan->syscon;    volatile cyg_uint32 *blcfg = (volatile cyg_uint32 *)edb7xxx_chan->control;    unsigned int baud_divisor = select_baud[new_config->baud];    cyg_uint32 _lcr;    if (baud_divisor == 0) return false;    // Disable port interrupts while changing hardware    _lcr = select_word_length[new_config->word_length - CYGNUM_SERIAL_WORD_LENGTH_5] |         select_stop_bits[new_config->stop] |        select_parity[new_config->parity] |        UBLCR_FIFOEN | UART_BITRATE(baud_divisor);#ifdef CYGDBG_IO_INIT    diag_printf("Set CTL: %x = %x\n", blcfg, _lcr);#endif    *blcfg = _lcr;    *syscon |= SYSCON1_UART1EN;    if (new_config != &chan->config) {        chan->config = *new_config;    }    return true;}// Function to initialize the device.  Called at bootstrap time.static bool edb7xxx_serial_init(struct cyg_devtab_entry *tab){    serial_channel *chan = (serial_channel *)tab->priv;    edb7xxx_serial_info *edb7xxx_chan = (edb7xxx_serial_info *)chan->dev_priv;#ifdef CYGDBG_IO_INIT    diag_printf("EDB7XXX SERIAL init - dev: %x.%d\n", edb7xxx_chan->control, edb7xxx_chan->tx_int_num);#endif    (chan->callbacks->serial_init)(chan);  // Really only required for interrupt driven devices    if (chan->out_cbuf.len != 0) {        cyg_drv_interrupt_create(edb7xxx_chan->tx_int_num,                                 99,                     // Priority - unused                                 (cyg_addrword_t)chan,   //  Data item passed to interrupt handler                                 edb7xxx_serial_tx_ISR,                                 edb7xxx_serial_tx_DSR,                                 &edb7xxx_chan->serial_tx_interrupt_handle,                                 &edb7xxx_chan->serial_tx_interrupt);        cyg_drv_interrupt_attach(edb7xxx_chan->serial_tx_interrupt_handle);        cyg_drv_interrupt_mask(edb7xxx_chan->tx_int_num);        edb7xxx_chan->tx_enabled = false;    }    if (chan->in_cbuf.len != 0) {        cyg_drv_interrupt_create(edb7xxx_chan->rx_int_num,                                 99,                     // Priority - unused                                 (cyg_addrword_t)chan,   //  Data item passed to interrupt handler                                 edb7xxx_serial_rx_ISR,                                 edb7xxx_serial_rx_DSR,                                 &edb7xxx_chan->serial_rx_interrupt_handle,                                 &edb7xxx_chan->serial_rx_interrupt);        cyg_drv_interrupt_attach(edb7xxx_chan->serial_rx_interrupt_handle);        cyg_drv_interrupt_unmask(edb7xxx_chan->rx_int_num);    }    edb7xxx_serial_config_port(chan, &chan->config, true);    return true;}// This routine is called when the device is "looked" up (i.e. attached)static Cyg_ErrNo edb7xxx_serial_lookup(struct cyg_devtab_entry **tab,                   struct cyg_devtab_entry *sub_tab,                  const char *name){    serial_channel *chan = (serial_channel *)(*tab)->priv;    (chan->callbacks->serial_init)(chan);  // Really only required for interrupt driven devices    return ENOERR;}// Send a character to the device output buffer.// Return 'true' if character is sent to devicestatic booledb7xxx_serial_putc(serial_channel *chan, unsigned char c){    edb7xxx_serial_info *edb7xxx_chan = (edb7xxx_serial_info *)chan->dev_priv;    volatile cyg_uint8  *data = (volatile cyg_uint8  *)edb7xxx_chan->data;    volatile cyg_uint32 *stat = (volatile cyg_uint32 *)edb7xxx_chan->stat;    if ((*stat & SYSFLG1_UTXFF1) == 0) {// Transmit buffer/FIFO is not full        *data = c;        return true;    } else {// No space        return false;    }}// Fetch a character from the device input buffer, waiting if necessarystatic unsigned char edb7xxx_serial_getc(serial_channel *chan){    unsigned char c;    edb7xxx_serial_info *edb7xxx_chan = (edb7xxx_serial_info *)chan->dev_priv;    volatile cyg_uint32 *data = (volatile cyg_uint32 *)edb7xxx_chan->data;    volatile cyg_uint32 *stat = (volatile cyg_uint32 *)edb7xxx_chan->stat;    while (*stat & SYSFLG1_URXFE1) ; // Wait for char    c = *data;    return c;}// Set up the device characteristics; baud rate, etc.static bool edb7xxx_serial_set_config(serial_channel *chan, cyg_serial_info_t *config){    return edb7xxx_serial_config_port(chan, config, false);}// Enable the transmitter (interrupt) on the devicestatic voidedb7xxx_serial_start_xmit(serial_channel *chan){    edb7xxx_serial_info *edb7xxx_chan = (edb7xxx_serial_info *)chan->dev_priv;    edb7xxx_chan->tx_enabled = true;    cyg_drv_interrupt_unmask(edb7xxx_chan->tx_int_num);}// Disable the transmitter on the devicestatic void edb7xxx_serial_stop_xmit(serial_channel *chan){    edb7xxx_serial_info *edb7xxx_chan = (edb7xxx_serial_info *)chan->dev_priv;    cyg_drv_interrupt_mask(edb7xxx_chan->tx_int_num);    edb7xxx_chan->tx_enabled = false;}// Serial I/O - low level Tx interrupt handler (ISR)static cyg_uint32 edb7xxx_serial_tx_ISR(cyg_vector_t vector, cyg_addrword_t data){    serial_channel *chan = (serial_channel *)data;    edb7xxx_serial_info *edb7xxx_chan = (edb7xxx_serial_info *)chan->dev_priv;    cyg_drv_interrupt_mask(edb7xxx_chan->tx_int_num);    cyg_drv_interrupt_acknowledge(edb7xxx_chan->tx_int_num);    return CYG_ISR_CALL_DSR;  // Cause DSR to be run}// Serial I/O - high level Tx interrupt handler (DSR)static void       edb7xxx_serial_tx_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data){    serial_channel *chan = (serial_channel *)data;    edb7xxx_serial_info *edb7xxx_chan = (edb7xxx_serial_info *)chan->dev_priv;    (chan->callbacks->xmt_char)(chan);    if (edb7xxx_chan->tx_enabled) {        cyg_drv_interrupt_unmask(edb7xxx_chan->tx_int_num);    }}// Serial I/O - low level Rx interrupt handler (ISR)static cyg_uint32 edb7xxx_serial_rx_ISR(cyg_vector_t vector, cyg_addrword_t data){    serial_channel *chan = (serial_channel *)data;    edb7xxx_serial_info *edb7xxx_chan = (edb7xxx_serial_info *)chan->dev_priv;    cyg_drv_interrupt_mask(edb7xxx_chan->rx_int_num);    cyg_drv_interrupt_acknowledge(edb7xxx_chan->rx_int_num);    return CYG_ISR_CALL_DSR;  // Cause DSR to be run}// Serial I/O - high level Rx interrupt handler (DSR)static void       edb7xxx_serial_rx_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data){    serial_channel *chan = (serial_channel *)data;    edb7xxx_serial_info *edb7xxx_chan = (edb7xxx_serial_info *)chan->dev_priv;    volatile cyg_uint32 *datreg = (volatile cyg_uint32 *)edb7xxx_chan->data;    volatile cyg_uint32 *stat = (volatile cyg_uint32 *)edb7xxx_chan->stat;    while (!(*stat & SYSFLG1_URXFE1))        (chan->callbacks->rcv_char)(chan, *datreg);    cyg_drv_interrupt_unmask(edb7xxx_chan->rx_int_num);}// Serial I/O - low level Ms interrupt handler (ISR)static cyg_uint32 edb7xxx_serial_ms_ISR(cyg_vector_t vector, cyg_addrword_t data){    serial_channel *chan = (serial_channel *)data;    edb7xxx_serial_info *edb7xxx_chan = (edb7xxx_serial_info *)chan->dev_priv;    cyg_drv_interrupt_mask(edb7xxx_chan->ms_int_num);    cyg_drv_interrupt_acknowledge(edb7xxx_chan->ms_int_num);    return CYG_ISR_CALL_DSR;  // Cause DSR to be run}// Serial I/O - high level Ms interrupt handler (DSR)static void       edb7xxx_serial_ms_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data){}#endif // CYGPKG_IO_SERIAL_ARM_EDB7XXX