[Buildroot] Compiling Device Tree with Buildroot
Arnout Vandecappelle
arnout at mind.be
Thu Oct 10 21:01:49 UTC 2019
On 08/10/2019 13:39, Gamble, Bradley wrote:
> Howdy,
>
>
> I'm trying to get Buildroot to compile our custom Device Tree file as part of the build process.
>
> I've previously been compiling it to a DTB file using "dtc" standalone and then embedding that as a node in a FIT image, however if possible I'd like to integrate this as a stage in Buildroot. I can use a post-build script to achieve this but if there is a "standard" method that would be preferred.
>
>
> Alternatively I was trying to build the Device Tree as part of the kernel. My Device Tree is comprised of three files under "br2-external/company/board/device-tree":
Indeed, Buildroot (currently) only supports compiling device trees as part of
the kernel build. In practice, you often need one or more of the in-kernel dtsis.
>
> - board.dts
>
> - board-pre.dtsi
>
> - board-post.dtsi
>
> The file board.dts includes board-pre.dtsi and board-post.dtsi.
>
> I've configured Buildroot to use an out-of-tree Device Tree however when it attempts to compile the board.dts file it is unable to find the pre and post files. Do I need to add a specific argument or flag so that the include directory is added?
BR2_LINUX_KERNEL_CUSTOM_DTS_PATH takes a list of .dts and .dtsi files. Only the
.dts files in the list will be compiled in a .dtb, the rest is just copied into
the kernel tree so the includes still work.
In other words, add the .dtsi files to BR2_LINUX_KERNEL_CUSTOM_DTS_PATH.
Regards,
Arnout
>
>
> Regards,
>
> Bradley Gamble
>
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> Bradley Gamble
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>
>
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