Created attachment 274363 [details] Full Bootlog Using a Gateworks Ventana board, powered by an i.MX6 board, following errors were notice upon boot: [ 22.617622] imx-uart 2020000.serial: DMA transaction error. [ 22.623228] imx-uart 2020000.serial: DMA transaction error. [ 22.628826] imx-uart 2020000.serial: DMA transaction error. [ 22.632611] A link change request failed with some changes committed already. Interface wlan0 may have been left with an inconsistent configuration, please check. [ 22.648951] imx-uart 2020000.serial: DMA transaction error. [ 22.654558] imx-uart 2020000.serial: DMA transaction error. [ 22.660156] imx-uart 2020000.serial: DMA transaction error. within OpenWrt, we are circumventing the errors currently by disabling DMA on UART: --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -1268,10 +1268,6 @@ static int imx_startup(struct uart_port writel(temp & ~UCR4_DREN, sport->port.membase + UCR4); - /* Can we enable the DMA support? */ - if (!uart_console(port) && !sport->dma_is_inited) - imx_uart_dma_init(sport); - spin_lock_irqsave(&sport->port.lock, flags); /* Reset fifo's and state machines */ i = 100; Full bootlog attached. This issue has been present since at least kernel 4.9