第二个问题:如下
【 1.522544] imx6ul-pinctrl 20e0000.iomuxc: pin MX6UL_PAD_UART2_RX_DATA already requested by 21e8000.serial; cannot claim for 2010000.ecspi
[ 1.535241] imx6ul-pinctrl 20e0000.iomuxc: pin-38 (2010000.ecspi) status -22
[ 1.542396] imx6ul-pinctrl 20e0000.iomuxc: could not request pin 38 (MX6UL_PAD_UART2_RX_DATA) from group oled on device 20e0000.iomuxc