UART with EDMA3 at 2mbps baud rate

Hi,

I am working on UART for Omapl138.I am using EDMA3 to receive data from UART.  I am using linking property of EDMA3. So once I programmed,EDMA3 param will continue to update and EDMA wil continue to receive data from UART FIFO.

The problem is,my EDMA work at 1.5mbps but it does not work at 2mbps or higher baud rate.At 2mbps EDMA3 is not able to get data from UART FIFO very quickly so FIFO over run occurs.As FIFO over run occurs,EDMA stops working as it does not pick erroneous data as mentioned in UART reference manual.

some importent setting are

acnt =1, bcnt= 6000, cnt =1

UART FIFO triger level = 1 but changing trigger level does not solve the problem.

I am using my own softwares.

is DMA is not capable to pick data so quickly?

Any help ?

Thanks&Regards

Jam