Compiling Device Tree with Buildroot

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":

- 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?

Regards,

Bradley Gamble

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Bradley Gamble
Software Engineer
Tel: +44 1293 580000

nCipher Security
Manor Royal
Crawley RH10 9HA
United Kingdom

www.ncipher.com<http://www.ncipher.com>

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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.

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