[yocto] [meta-raspberrypi] how to customize kernel config?

[Jonatan Magnusson]

Hi

I’m trying to use the meta-raspberrypi BSP with Yocto (1.6, Daisy).

It works great, except I have no idea how to use a custom kernel config!

I have a custom kernel recipe that bbappends to the meta-raspberrypi kernel recipe.

I’ve tried using defconfig as well as configuration fragments, but neither work.

I’ve also tried using the kernel_configure_variable function, and that almost works, except if I try to disable an option that is enabled earlier in the the config file, the option is still enabled since kernel_configure_variable only appends to the config file.

Example:

do_configure_append() {
  kernel_configure_variable SPI_SPIDEV n
}

So I wonder: how is this supposed to work?

In my case I need to enable CONFIG_IEEE802154_MRF24J40 and it’s dependencies and disable CONFIG_SPI_SPIDEV and a few more.

I’ve found no help on IRC and all Google comes up with is this old discussion, which does not lead to a solution:

https://lists.yoctoproject.org/pipermail/yocto/2013-November/017113.html

I would be very happy to get any hints on how this is supposed to work!

Regards,
Jonatan Magnusson