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

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

Hi Will!

Am 07.05.25 um 17:41 schrieb buildroot@cairnwater.com:
> Does anyone have any advice on how to add DTOs needed by libcamera to a 
> buildroot build?
> 
> We'd like to add Kieran's DTOs
> 
> https://git.uk.ideasonboard.com/camera/dt-overlays/src/branch/main/arch/ 
> arm64/boot/dts/freescale
> 
> to the buildroot default configuration for Debix Model A SBC
> 
> https://github.com/buildroot/buildroot/blob/master/configs/ 
> polyhex_debix_model_a_defconfig
> 
> Ideally we'd also like to add the overlays for the Sony IMX 708 Image 
> Sensor used in the RPi V3 camera but these aren't mainline:
> 
> https://github.com/raspberrypi/linux/blob/rpi-6.12.y/arch/arm/boot/dts/ 
> overlays/imx708-overlay.dts
> https://github.com/raspberrypi/linux/blob/rpi-6.12.y/arch/arm/boot/dts/ 
> overlays/imx708.dtsi

You can use BR2_LINUX_KERNEL_CUSTOM_DTS_DIR for that: Just place the 
DTSOs in the configured directory (with appropriate structure), and 
Buildroot will build them automatically. DTBOs will be in 
${OUTPUT_DIR}/images. From there you'll need to adjust the boot process 
for your board to actually apply the overlay. If you want to send a 
patch, the BR2_LINUX_KERNEL_CUSTOM_DTS_DIR should be inside the board 
directory.

With RPi overlays you'll probably have to adjust the overlays a bit so 
referenced names fit, etc. You're using a different board, and I've seen 
cases where DTS for RPi boards from mainline and RPi kernels use 
different names. But that doesn't change the build process. :-)

Best regards,
Fiona

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