topic Re: Rootfs Mount Issue on custom based board IMX8DX in i.MX Processors

Rootfs Mount Issue on custom based board IMX8DX

mallikarjuntera — Thu, 25 Aug 2022 06:45:59 GMT

Hi All,

we are doing kernel migration from kernel-4.14.98 to 5.10.72_2.2.0 to our custom board based out of IMX8DX.

Source version: linux-imx-5.10.72_2.2.0

we are facing the issue regarding the eMMC mount ,for reference i have attached the logs and defconfig below, please have a look and Kindly help on this issue.

[ 1.384161] VFS: Cannot open root device "mmcblk0p1" or unknown-block(0,0): error -6
[ 1.389124] platform regulatory.0: Falling back to sysfs fallback for: regulatory.db
[ 1.396854] Please append a correct "root=" boot option; here are the available partitions:
[ 1.412938] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[ 1.421165] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.10.72-lts-5.10.y+ga68e31b63f86 #1

Re: Rootfs Mount Issue on custom based board IMX8DX

jimmychan — Thu, 25 Aug 2022 09:50:45 GMT

Seems the mmcblk0 is not exist.

Please check the emmc setting in the dts file.

Re: Rootfs Mount Issue on custom based board IMX8DX

mallikarjuntera — Fri, 26 Aug 2022 05:05:44 GMT

Thanks for reply,

yes , we have add mmc related changes in dts file.

Below are the changes related to eMMC. please have a look.

Included DTSI files are:

#include "imx8dx.dtsi"
#include "imx8x-mek.dtsi"

This is the USDHC1 node which we are adding into our dts file.

&usdhc1 {
pinctrl-names = "default", "state_100mhz", "state_200mhz";
pinctrl-0 = <&pinctrl_usdhc1>;
pinctrl-1 = <&pinctrl_usdhc1_100mhz>;
pinctrl-2 = <&pinctrl_usdhc1_200mhz>;
bus-width = <8>;
non-removable;
status = "okay";
};

Kindly let me know is something we are missing in our dts file.

Re: Rootfs Mount Issue on custom based board IMX8DX

jimmychan — Mon, 29 Aug 2022 07:01:20 GMT

In the imx8x-mek.dtsi, there are already usdhc1 setting for the EMMC.

https://source.codeaurora.org/external/imx/linux-imx/tree/arch/arm64/boot/dts/freescale/imx8x-mek.dtsi?h=lf-5.10.y

Re: Rootfs Mount Issue on custom based board IMX8DX

mallikarjuntera — Mon, 29 Aug 2022 10:18:05 GMT

Hi Jimmy,

I agree that the node USDHC1 is already present in imx8x-mek.dtsi. And we have removed the the duplicated node USHDC1 from our dts file.

we tried with these changes also , but still facing the issue.

can you help us here,

Re: Rootfs Mount Issue on custom based board IMX8DX

jimmychan — Tue, 30 Aug 2022 04:02:37 GMT

Do you use the UUU to program the rootfs image to the mmcblk0p1?

Re: Rootfs Mount Issue on custom based board IMX8DX

mallikarjuntera — Tue, 30 Aug 2022 08:44:55 GMT

yes , we use UUU tool to program the rootfs image.

Re: Rootfs Mount Issue on custom based board IMX8DX

jimmychan — Tue, 30 Aug 2022 09:21:43 GMT

please check the partition mmcblk0p1 is well created.