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imx6ull Uart5 Rx/Tx problem in L4.14.98

Question asked by guochgz on Sep 5, 2019


      I have change the baseline from L4.1.15 to L4.14.98. then faced a new problem. that the uart(5) rx/tx is not stable. pls see:


      I keep typing in char '2', but the seems the some bytes is wrong. 

      I have read this topic:

      imx6ul - UART Rx dropping/corrupting bytes 

      so there is two question:

      1:  How to change the default configuration of UART, DMA or interrupt.

      2:  How to increase rx/tx recieve buf size?