imx6ul UART bytes are dropping(sumo-kernel 4.14.78-1.0.0_ga)

[michaelwesley]

Recently i moved my distro to yocto sumo from yocto jethro branch. In the kernel, i'm getting the following issue in the UART related with SDMA like, 

imx-sdma 20ec000.sdma: external firmware not found, using ROM firmware

We are using uart ports majorly for communication and we are not changing anything related to uart in the imx6ul.dtsi file. Our older BSP(kernel 4.1.15) is completely working fine with the uart application. We want to go with 4.14.78 version for our device, is there any way to use the UART on this version of imx6ul without any trouble??

[Yuri]

Hello,

    It is highly recommended to use hardware flow control (CTS\RTS)  for  high speed

DMA UART transfer.

  Also customers can try to use XON/XOFF software flow control.

Have a great day,
Yuri

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