topic Re: IMX6 Uart Overrun in i.MX Processors

IMX6 Uart Overrun

mostion — Thu, 13 Apr 2017 03:50:17 GMT

Hi,

We use the IMX6 processor for some time now. But recently, we need use one uart port at 460800 baud, and then, we found some system error message said Rx FIFO overrun. We check the drivers code repeatedly, and make some test for it, but we have no idea for this issue. Anyway, if the baud is larger than 115200, like 230400, the Rx FIFO always overrun. We attempt to disable all function unused, just remain some necessities about uart, but it not worked.

By the way, we have a platform used the IMX535 processor run same baud on uart, but it seemed everything is OK.

On the other side, we update some later driver code, it also can not fix this. Our Linux kernel is 3.10.7.

Re: IMX6 Uart Overrun

mostion — Thu, 13 Apr 2017 04:20:11 GMT

If some guys have some ideas about this, Please give us some suggestions.

Thanks!

Re: IMX6 Uart Overrun

Yuri — Fri, 12 May 2017 10:00:36 GMT

Hello,

It is needed to use DMA for high speed UART transfer.
Note, for UART DMA, hardware flow control (CTS\RTS) should be applied.

Nevertheless, You may try to use XON/XOFF software flow control.

Have a great day,
Yuri

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