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"imx-uart 21f0000.serial: overwrite!" errors on i.MX6 board

Question asked by Seth Richards on Oct 5, 2015
Latest reply on Oct 13, 2015 by igorpadykov

Our device uses an internal UART on the i.MX6 chip to communicate with a peripheral chip. We're running the 3.10 Linux kernel from Freescale. We occasionally see "imx-uart 21f0000.serial: overwrite!" errors on this UART, and we have occasional problems communicating with this peripheral. This appears to be a DMA overrun error on the UART, and when I comment out DMA support for this UART, I see occasional "Rx FIFO overrun" errors on this channel. Does anyone have any experience with what might cause these errors? Thanks.

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