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AM335X: UART DMA transfers random stop

Other Parts Discussed in Thread: AM3356

I am using Sitara processor am3356.

trying to implement dma to work with uart (uart 2 & 4) and triggered by internal events from uart towards the DMA

while transmitting and receiving to and from the uart, after a while (after not determine time) the DMA stop transferring data from uart

nevertheless  the uart continue receive bytes.

any ideas?