topic imx-uart 21e8000.serial: Rx FIFO overrun in i.MX Processors https://community.nxp.com/t5/i-MX-Processors/imx-uart-21e8000-serial-Rx-FIFO-overrun/m-p/663154#M101826 <HTML><HEAD></HEAD><BODY><P>Hi，</P><P>&nbsp;&nbsp;&nbsp;I am using i.MX6ul&nbsp;<SPAN style="color: #51626f; background-color: #ffffff;"> core processor，use uart2 in 230400Baud,sometimes get error&nbsp;<EM>imx-uart 21e8000.serial: Rx FIFO overrun.</EM></SPAN></P><P><SPAN style="color: #51626f; background-color: #ffffff;"><EM>&nbsp;&nbsp;&nbsp;</EM>following <EM>dmesg,</EM> I found this error msg followed <EM>Bus freq set to 24000000 &nbsp;msg。So i</EM> guess when the data transmission &nbsp;in UART ,this time the Bus freq&nbsp;reduced,then RX FIFO overrun.<SPAN style="background-color: #ffffff;">Could someone help me to fixed.</SPAN><BR /></SPAN></P><P><SPAN style="color: #51626f; background-color: #ffffff;"><EM><span class="lia-inline-image-display-wrapper" image-alt="MV3)R~A]]MUN{A%CN@_[KYE.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/6365i120B9E60CB566F7A/image-size/large?v=v2&amp;px=999" role="button" title="MV3)R~A]]MUN{A%CN@_[KYE.png" alt="MV3)R~A]]MUN{A%CN@_[KYE.png" /></span></EM></SPAN></P><DIV> </DIV></BODY></HTML> Thu, 05 Jan 2017 06:59:22 GMT lujfsd 2017-01-05T06:59:22Z imx-uart 21e8000.serial: Rx FIFO overrun https://community.nxp.com/t5/i-MX-Processors/imx-uart-21e8000-serial-Rx-FIFO-overrun/m-p/663154#M101826 <HTML><HEAD></HEAD><BODY><P>Hi，</P><P>&nbsp;&nbsp;&nbsp;I am using i.MX6ul&nbsp;<SPAN style="color: #51626f; background-color: #ffffff;"> core processor，use uart2 in 230400Baud,sometimes get error&nbsp;<EM>imx-uart 21e8000.serial: Rx FIFO overrun.</EM></SPAN></P><P><SPAN style="color: #51626f; background-color: #ffffff;"><EM>&nbsp;&nbsp;&nbsp;</EM>following <EM>dmesg,</EM> I found this error msg followed <EM>Bus freq set to 24000000 &nbsp;msg。So i</EM> guess when the data transmission &nbsp;in UART ,this time the Bus freq&nbsp;reduced,then RX FIFO overrun.<SPAN style="background-color: #ffffff;">Could someone help me to fixed.</SPAN><BR /></SPAN></P><P><SPAN style="color: #51626f; background-color: #ffffff;"><EM><span class="lia-inline-image-display-wrapper" image-alt="MV3)R~A]]MUN{A%CN@_[KYE.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/6365i120B9E60CB566F7A/image-size/large?v=v2&amp;px=999" role="button" title="MV3)R~A]]MUN{A%CN@_[KYE.png" alt="MV3)R~A]]MUN{A%CN@_[KYE.png" /></span></EM></SPAN></P><DIV> </DIV></BODY></HTML> Thu, 05 Jan 2017 06:59:22 GMT https://community.nxp.com/t5/i-MX-Processors/imx-uart-21e8000-serial-Rx-FIFO-overrun/m-p/663154#M101826 lujfsd 2017-01-05T06:59:22Z Re: imx-uart 21e8000.serial: Rx FIFO overrun https://community.nxp.com/t5/i-MX-Processors/imx-uart-21e8000-serial-Rx-FIFO-overrun/m-p/663155#M101827 <HTML><HEAD></HEAD><BODY><P>Hi jiefeng</P><P></P><P>to avoid uart overruns one can try flow control.</P><P>To disable the bus frequency driver use the following command:<BR />echo 0 &gt; /sys/bus/platform/drivers/imx6_busfreq/busfreq.13/enable<BR />Also please check advices on &nbsp;</P><P><A _jive_internal="true" href="https://community.nxp.com/thread/429536">https://community.nxp.com/thread/429536</A></P><P></P><P>Best regards<BR />igor<BR />-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Fri, 06 Jan 2017 00:00:19 GMT https://community.nxp.com/t5/i-MX-Processors/imx-uart-21e8000-serial-Rx-FIFO-overrun/m-p/663155#M101827 igorpadykov 2017-01-06T00:00:19Z