Hi Etienne,

> I also used gdbserver to find out where the problem is. Here is the
> backtrace from where i think the failure is :
>
>     │230                     }
>     │231             }
>     │232
>  >│233             fd = open(tty, O_RDWR | O_NOCTTY |
> O_NONBLOCK);               /* the open function fails and returns -1 */
>     │234             if (fd < 0)
>     │235                     return -1;
>     │236
>     │237             tcflush(fd, TCIOFLUSH);
>

Can you trace and see what the errno is being set to?  I really have no 
idea what could be causing this.

Regards,
-Denis