How to set UART with high baud rate?

Hi,

I am using am335x EVM with SDK 5.06 on Linux 12.04. Right now, I chose 'profile 3' and I can successfully set one UART (ttyO2) to talk at 921600 no problem. However, I need set the baud rate at a higher rate = 3686400. Compile error says 'B3886400' is 'undeclared'. 

Can am335x UART be configured at a baud rate higher than 921600? If it can, how do I set it?

Please help.

Thanks.