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#define READ_UINT8( _register_, _value_ ) \

        ((_value_) = *((volatile unsigned char *)(_register_)))

#define WRITE_UINT8( _register_, _value_ ) \

        (*((volatile unsigned char *)(_register_)) = (_value_))

 /* - Board specific addresses for serial chip */

#define DIAG_BASE       0xfffff300

#define DIAG_SLCR       (DIAG_BASE+0x00)

#define DIAG_SLSR       (DIAG_BASE+0x04)

#define DIAG_SLDICR     (DIAG_BASE+0x08)

#define DIAG_SLDISR     (DIAG_BASE+0x0C)

#define DIAG_SFCR       (DIAG_BASE+0x10)

#define DIAG_SBRG       (DIAG_BASE+0x14)

#define DIAG_TFIFO      (DIAG_BASE+0x20)

#define DIAG_RFIFO      (DIAG_BASE+0x30)

#define BRG_T0          0x0000

#define BRG_T2          0x0100

#define BRG_T4          0x0200

#define BRG_T5          0x0300

#define READ_UINT16( _register_, _value_ ) \

     ((_value_) = *((volatile unsigned short *)(_register_)))

#define WRITE_UINT16( _register_, _value_ ) \

     (*((volatile unsigned short *)(_register_)) = (_value_))

unsigned char

inbyte (void)

{

  unsigned char c;

  unsigned short disr;

  for (;;)

    {

      READ_UINT16 (DIAG_SLDISR, disr);

      if (disr & 0x0001)

        break;

    }

  disr = disr & ~0x0001;

  READ_UINT8 (DIAG_RFIFO, c);

  WRITE_UINT16 (DIAG_SLDISR, disr);

  return c;

}

void

outbyte (unsigned char c)

{

  unsigned short disr;

  for (;;)

    {

      READ_UINT16 (DIAG_SLDISR, disr);

      if (disr & 0x0002)

        break;

    }

  disr = disr & ~0x0002;

  WRITE_UINT8 (DIAG_TFIFO, c);

  WRITE_UINT16 (DIAG_SLDISR, disr);

}

/* Stuff required to setup IO on this board */

void board_serial_init (void)

{

  WRITE_UINT16 (DIAG_SLCR, 0x0020);

  WRITE_UINT16 (DIAG_SLDICR, 0x0000);

  WRITE_UINT16 (DIAG_SFCR, 0x0000);

  WRITE_UINT16 (DIAG_SBRG, BRG_T2 | 5);

}

/* If you want this to be initialized as part of the stuff which gets called

   by crt0, it should be named 'hardware_init_hook'.

   Local implementations may want to move or add to this function OR

   do the initializations after main() is entered.

*/

void hardware_init_hook(void)

{

  board_serial_init() ;

}