Re: [Buildroot] Adding Device Tree Overlays for MIPI-CSI2 Camera and libcamera to a buildroot Build

[Fiona Klute via buildroot <buildroot@buildroot.org>]

Am 14.05.25 um 19:36 schrieb buildroot@cairnwater.com:
>> Either way you may have to enable overlay support in the U-Boot build 
>> config (if it isn't by default).
> 
> I looked in
> 
> https://github.com/buildroot/buildroot/blob/master/configs/ 
> polyhex_debix_model_a_defconfig
> 
> but couldn't work out how to enable overlay support. Is that usually an 
> existing line in the defconfig that should be amended or a new line that 
> should be added?

U-Boot build config is separate from Buildroot config. In your Buildroot 
config you can either choose a U-Boot defconfig (part of the U-Boot 
sources) to use, or set a custom U-Boot (def-)config file to use. There 
are also make commands to open the U-Boot config editor and save a 
U-Boot defconfig (same idea as saving a custom Buildroot defconfig). The 
same applies for the Linux kernel and a few other components. See 
"Configuration of other components" in the docs, it lists both make 
commands and config options:
https://nightly.buildroot.org/#_configuration_of_other_components

Mind that I wrote you *may* need to enable device tree overlay support 
because I don't know all the U-Boot defconfigs, it's very well possible 
that the one for your board already enables it by default and you don't 
need to change a thing in that regard.

Best regards,
Fiona

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