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USB-Serial converter cp2012 under am335x

Hi,

I am using cp2102 and connected the converter to my one USB of am335x processor. I have included drivers under the kernel.

While booting it has created the /dev/ttyUSB0 interface. I am getting only receiving using this interface. one way is working. 

When i try to write something over /dev/ttyUSB0 it is not reaching to the other peripheral. Is it required any flow control. handshaking is not proper.

could you help on my problem. Any driver changes required.

Thanks