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AM3354: The serial port turns on DMA, occasional packet loss will occur

Part Number: AM3354

Hi team,

The serial port receives GPS data at a baud rate of 921600, 20 Hz with an 8250 drive on DMA, and occasionally loses packets. An overrun error has occurred. When driven with a serial omap, packets are not lost, but the system will get stuck. Tested with kernel version 4.14.79 and the problem remains. 

Could you help check this case? Thanks.

Best Regards,