As a learning experience, I am trying to build a downstream kernel from source. It works, but it requires that I manually make a directory in the yocto `tmp/` folder, and I am trying to understand why :-).
I created a BSP layer, and I want to use one of the downstream dts files [1]. Because that file is in `arch/arm/boot/dts/qcom/msm8909-pm8916-mpp3-hw00.dts`, my machine configuration sets: ``` KERNEL_DEVICETREE += "qcom/msm8909-pm8916-mpp3-hw00.dtb" ``` I `inherit kernel` in my linux recipe, which I believe will build the dtb from the corresponding dts in the downstream sources. However, somewhere during the build process, I get the following error: ``` | DTC arch/arm/boot/dts/qcom/msm8909-pm8916-mpp3-hw00.dtb | cc1: fatal error: opening output file arch/arm/boot/dts/qcom/.msm8909-pm8916-mpp3-hw00.dtb.dts.tmp: No such file or directory ``` If I create the following `qcom` directory manually and re-run `bitbake virtual/kernel`, then it works: ``` mkdir tmp/work/skycontroller3-poky-linux-gnueabi/linux-skycontroller3/3.18.31-r0/linux-skycontroller3-standard-build/arch/arm/boot/dts/qcom ``` So it feels like this `qcom/` subdirectory poses problems. I am not sure if I am missing a configuration somewhere, or if that could be a bug (or maybe the dts should be in `boot/dts` and never in a subdir like `boot/dts/qcom`?). I read through `classes/devicetree.bbclass` and `classes/kernel-devicetree.bbclass`, but I don't think that the `*.dts.dtb.tmp` file is created there. Looking for insights on what may be going wrong here :-). Best, Jonas [1]: https://github.com/parrot-opensource/skycontroller3-opensource/blob/master/sources/linux-3.18.31/linux-3.18.31/arch/arm/boot/dts/qcom/msm8909-pm8916-mpp3-hw00.dts
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