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

Cherry Zhou
Mastermind 22235 points
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,

Cherry