Due Serial config para set?

Hi
I have a due,and I want to set Serial config likethis:
Serial.begin(115200,SERIAL_8O1 );
but when i compile it,I got mistaken like thie:
erialserver.ino: In function 'void setup()':
serialserver:34: error: 'SERIAL_8O1' was not declared in this scope.
I use 1.5.6 r2 IDE.
can anbody help me,thanks.

It shouldn't be a problem in a standard sketch, please post the entire sketch.

what means the entire sketch?