A13-olinuxino serial port baud rate

[Teo89]

Hi,
I'm using an A13 board with an android application to communicate with a dspic30f4013. For the moment the baud rate is 115200 on ttys1 and i wish to have an higher baud rate. If i try to set the baud rate at 230400 the communication won't work. Is there a way to use higher speed?
Thank you,
Matteo