How to build a kernel module?

Hi,

could you please provide a description how to build a kernel module.

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Split from How to use IOT2050 SDK with Eclipse.

Are we talking about an out-of-tree kernel modul or a driver that is part of the kernel but is not yet enabled in the config?

For the former case: The currently released SDK does not yet include support for this, but the one you can build yourself from https://github.com/siemens/meta-iot2050/#build-user-sdk contains this feature.

An alternative is creating your own image layer and adding a recipe for the particular out-of-tree module. Examples are https://github.com/ilbers/isar/tree/master/meta-isar/recipes-kernel/example-module or https://github.com/siemens/jailhouse-images/tree/master/recipes-kernel/xradio.

But be warned about ouf-of-tree kernel drivers: They tend to be of low quality.

 Hi

jan-k

Are we talking about an out-of-tree kernel modul or a driver that is part of the kernel but is not yet enabled in the config?

For the former case: The currently released SDK does not yet include support for this, but the one you can build yourself from https://github.com/siemens/meta-iot2050/#build-user-sdk contains this feature.

 I tied this with the dokumentation from How to use IOT2050 SDK with Eclipse. But i was not able to build the module with my own created sdk from meta-iot2050. Maybe i missed something in the eclipse settings or compiler / linker settings.

jan-k 

An alternative is creating your own image layer and adding a recipe for the particular out-of-tree module. Examples are https://github.com/ilbers/isar/tree/master/meta-isar/recipes-kernel/example-module or https://github.com/siemens/jailhouse-images/tree/master/recipes-kernel/xradio.

I went this way. I put the source of the module in the recipes-kernel folder and added a line "nameofmodule-${KERNEL_NAME}" to the INCLUDE_IMAGE += at meta-iot2050/recipes-core/images/iot2050-image-example.bb

Thank you