IMX219 Probe

[richardcusolito1]

What in the kernel settings causes the imx219 module to be loaded on bootup. Is it a configuration file somewhere? or is it a setting when the kernel is compiled?

I am running an orin nano devkit on 36.3.

[nagesh_accord]

It is configuration file in tegra_defconfig. You need to check of you have entry for it inside that file.

Refer this below link with similar solution:

orinNano Kernel added other driver, and need to modify the device tree, how do I need to operate

For this, I think you need to manually go and add entry for inside tegra_defconfig file( in the path kernel-5.10/arch/arm64/configs/tegra_defconfig ) example: CONFIG_VIDEO_IMX412=y , before compiling using nvbuild.sh Refer this link: https://docs.nvidia.com/jetson/archives/r36.3/DeveloperGuide/AT/JetsonLinuxDevelopmentTools/DebuggingTheKernel.html#modifying-the-kernel-configuration-file

[richardcusolito1]

This is what I had originally suspected, but when I check that file , there is no CONFIG_VIDEO_IMX219=y. Yet that imx219 is still loaded at boot time, as shown by dmesg.

I have not modified the source code in anyway either before building and flashing.

[nagesh_accord]

@richardcusolito1

Yet that imx219 is still loaded at boot time, as shown by dmesg.

My thoughts:
Might be that driver is built as part of kernel image itself
, which is like an in tree module…

[richardcusolito1]

The probe function being called at boot up is part of the nvidia-oot module, as it references a board_setup function which is only part of the nv_imx219.c file in the out of tree module. There is an imx219.c file in tree however this is just for V4L2 and not the one being called on bootup.

[richardcusolito1]

For anyone else that needs to know or runs into a similar issue. You can use the jetson-io.py file to set the /boot/extlinux/extlinux.conf or set the extlinux.conf file manually. This will apply the device tree overlay. However my device tree still wasn’t linking to my device driver like I wanted it to. This is because you need to change the /usr/lib/modules/*-tegra/modules.alias file for them to “find” each other. Once I modified this I could see my probe function for my device driver was being called like I wanted.