How to use UART1 and UART2 on xM rev.A3 ?

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Hi everyone
I want to use UART1 and UART2 on xM rev.A3.
Now,Echo 'blah....' > /dev/ttyS1 and I probe pulse with oscilloscope.
It not found data on pin RX,TX on expansion port.
I use kernel-omap-2.6.37.
How to config mux file for use it?

Thank you