topic LPUART3 abnormal,imx8qxp startup from SD in i.MX Processors

LPUART3 abnormal,imx8qxp startup from SD

liuyonggang — Wed, 22 Jan 2020 07:36:09 GMT

Board:imx8qxp

Enviroment:yocto

dts config:

pinctrl_lpuart3: lpuart3grp {
fsl,pins = <
SC_P_FLEXCAN2_TX_ADMA_UART3_TX 0x06000020
SC_P_FLEXCAN2_RX_ADMA_UART3_RX 0x06000020
>;
};

kernel startup from OSPI/eMMC is nornal,but kernel startup from SD is abnormal,logs as following:

[ 1.434158] imx8qxp-pinctrl iomuxc: pin_config_set op failed for pin 110
[ 1.440888] fsl-lpuart 5a090000.serial: Error applying setting, reverse things back
[ 1.449278] 5a090000.serial: ttyLP3 at MMIO 0x5a090010 (irq = 54, base_baud = 5000000) is a FSL_LPUART

kernel startup from OSPI,fdt_file=fsl-imx8qxp-ctx0800-rohs.dtb in uboot.

kernel startup from SD,fdt_file=fsl-imx8qxp-ctx0800-rohs-rpmsg.dtb in uboot.Moreover

in fsl-imx8qxp-ctx0800-rohs-rpmsg.dtsi file,I masked

&lpuart3 {
status = "disabled";
};

kernel startup from OSPI or kernel startup from SD,The kernel Images are same.

I set enviroment varaible fdt_file=fsl-imx8qxp-ctx0800-rohs.dtb,When kernel startup from SD.But consequence is same.

Can somebody help me?

Tks!

Best Regards！

Re: LPUART3 abnormal,imx8qxp startup from SD

igorpadykov — Wed, 22 Jan 2020 11:14:32 GMT

Hi liu

lpuart3 may be used by SDK_MEK-MIMX8QX (MCUXpresso SDK for i.MX Cortex-M),

please check MLK-21173 ARM64: dts: fix imx8qxp-pinctrl iomuxc error

linux-imx - i.MX Linux kernel

"..assign all flexcan pins to M4, A core cannot access flexcan pins for now. LPUART3

uses flexcan pins before, so disable it.."

One can try to remove below two lines in : /vendor/nxp/fsl-proprietary/uboot-firmware/imx8q_car/board-imx8qxp.c

BRD_ERR(rm_set_pad_movable(pt_boot, SC_P_FLEXCAN0_RX,
SC_P_FLEXCAN2_TX, SC_TRUE));

And then use this board.c file to build scfw with scfw-porting-kit release to test.

Best regards
igor
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Re: LPUART3 abnormal,imx8qxp startup from SD

liuyonggang — Wed, 05 Feb 2020 01:50:03 GMT

Hi igor,

Tks for your suggestion.

I try to mask BRD_ERR(rm_set_pad_movable(pt_boot, SC_P_FLEXCAN0_RX,
SC_P_FLEXCAN2_TX, SC_TRUE)); in function board_system_config of file imx-scfw/platform/board/mx8qx_mek/board.c,and I rebuild.

It works.

Best Regards!

Johnny