Multiple rtems_io_register_name

[Chris Johns]

Cedric Aubert wrote:
> 
> I want to known if it's possible and a correct usage
> to do multiple rtems_io_register_name for have more
> device with same major minor couple for serial port.
> 
> Example, to have /dev/console and /dev/ttyS0 and
> to the same physical serial port. If it's exist a more
> beuatiful manner to do a link like this, thank to tell
> me.
> 

For our boards we create devices with names such as /dev/porta 
/dev/portb, etc that relate to the connector documentation and then link 
them with a 'symlink' to a logical device name, ie /dev/ttyS0, ie:

   /dev/ttyS0 -> /dev/porta

The code is:

   status = rtems_io_register_name ("/dev/porta", 4, 0);
   if (status != RTEMS_SUCCESSFUL)
     rtems_fatal_error_occurred (status);

   status = rtems_io_register_name ("/dev/portb", 4, 1);
   if (status != RTEMS_SUCCESSFUL)
     rtems_fatal_error_occurred (status);

   if (symlink ("/dev/porta", "/dev/ttyS0") < 0)
     printf (" sfp-core target init: cannot make symlink to porta, %s",
             strerror (errno));

   if (symlink ("/dev/portb", "/dev/ttyS1") < 0)
     printf (" sfp-core target init: cannot make symlink to portb, %s",
             strerror (errno));

-- 
  Chris Johns, cjohns at cybertec.com.au