As a learning experience, I am trying to create a BSP for a device I own and whose downstream kernel is published. The device in question is the Parrot Skycontroller3, and the sources are available here <https://github.com/parrot-opensource/skycontroller3-opensource>.
Let me start by sharing my issue. When I build the kernel with `bitbake virtual/kernel`, it fails with errors like: ``` | AS arch/arm/lib/backtrace.o | AS arch/arm/lib/bswapsdi2.o | AS arch/arm/lib/call_with_stack.o | /tmp/ccz8jKgm.s: Assembler messages: | /tmp/ccz8jKgm.s:985: Error: .err encountered | /tmp/ccz8jKgm.s:1033: Error: .err encountered | /tmp/ccz8jKgm.s:6812: Error: .err encountered ``` My layer is available here. <https://github.com/JonasVautherin/meta-skycontroller3> I created it getting inspiration from meta-raspberrypi and meta-qti-bsp <https://github.com/mcharleb/meta-qti-bsp/blob/yocto.lnx.1.0.r10-rel/conf/machine/apq8009.conf>, which seems to have the same CPU: apq8009. According to the Parrot sources <https://github.com/parrot-opensource/skycontroller3-opensource/blob/master/sources/linux-3.18.31/atom.mk#L1>, my device runs a Qualcomm apq8009/msm89090 cpu. In my repo, I use as a defconfig file the linux.config <https://github.com/parrot-opensource/skycontroller3-opensource/blob/master/sources/linux-3.18.31/linux.config> that is available in the Parrot sources (I copied it in my kernel recipe under `files/defconfig` and added it to SRC_URI). The Parrot sources <https://github.com/parrot-opensource/skycontroller3-opensource/blob/master/sources/linux-3.18.31/atom.mk#L12> also refer to `LINUX_DEFAULT_CONFIG_TARGET := msm8909_defconfig`, so I tried to set `KBUILD_DEFCONFIG = "msm8909_defconfig"`, but that is failing with different errors, such as: ``` error: 'VM_ARM_DMA_CONSISTENT' undeclared (first use in this function); did you mean 'DMA_ATTR_NON_CONSISTENT'? ``` or ``` error: 'L_PTE_YOUNG' undeclared ``` As a side note, their `drivers/Kconfig` seemed invalid, so I patched it <https://github.com/JonasVautherin/meta-skycontroller3/blob/main/recipes-kernel/linux/files/Kconfig.patch> . I am a bit lost now, not completely sure where my issues come from. I realize that changing the defconfig has quite some impact (I get different errors), and also that my machine configuration <https://github.com/JonasVautherin/meta-skycontroller3/tree/main/conf/machine> may be completely wrong (I am essentially guessing from the fact that it is an apq8009/msm8909, but for instance the tuning I just copied from meta-qti-bsp, which may be invalid). I would be glad if I could get hints about debugging this. Again, it is really a learning project: I would like to learn how to create a BSP from a downstream kernel. Best,
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