i.MX ProcessorsのトピックRe: How to load and install module automatically at kernel bootup in standalone build?

How to load and install module automatically at kernel bootup in standalone build?

RVT — Fri, 19 May 2023 04:09:35 GMT

Hello, NXP experts:

By using demo files (LF_v6.1.1_1.0.0_images_IMX8MPEVK or LF_v5.15.71-2.2.0_images_IMX8MPEVK) from "https://www.nxp.com/design/software/embedded-software/i-mx-software/embedded-linux-for-i-mx-applications-processors:IMXLINUX", all peripherals can be found and loaded properly on i.MX 8M Plus EVK.

For example, WM8960 can be found with demo files.

But there is no peripherals found by using the standalone built image with "https://github.com/nxp-imx/linux-imx". The default "imx_v8_defconfig" and "imx8mp-evk.dts" are applied in the build.

For example, no soundcard can be found with standalone built kernel image.

How can I build the same kernel image as the demo files?

Thanks.

Re: How to load and install module automatically at kernel bootup in standalone build?

Dhruvit — Mon, 22 May 2023 11:36:36 GMT

Hi @RVT,

I hope you are doing well.

One needs to enable menuconfig options in the kernel to load specific modules.

Please refer to 7.1.4.6 Menu Configuration Options in i.MX Linux Reference Manual to enable SoC Audio supports for WM8958, WM8960, and WM8962 CODEC.

One can add module names in /etc/modules-load.d/<module_list>.conf to automatically load kernel modules.

Thanks & Regards,
Dhruvit Vasavada

Re: How to load and install module automatically at kernel bootup in standalone build?

RVT — Fri, 26 May 2023 09:09:28 GMT

Hi Dhruvit,

Attached please find the .config & imx_v8_defconfig files at iMX Linux kernel at https://github.com/nxp-imx/linux-imx.

There is no option for wm8960 as shown in 7.1.4.6.

I intend to port another codec to EVK platform by following the baseline EVK kernel code. Therefore, I would like to know all know-how in order to let a new codec to work with iMX8MP SAI and audio framework. Firstly, I have to build the same as the demo files.

Also, can NXP provide something like audio subsystem linux porting guide - user manual?

Thanks.