Troubleshooting Device Tree Issues (AGX Orin)

[conradmenchine]

Hi, I'm trying to make a trivially simple modification of the device tree on an AGX Orin dev kit. Here is my dts file:

/dts-v1/;
/plugin/;
/ {
    compatible = "nvidia,p3737-0000+p3701-0000", "nvidia,p3701-0000", "nvidia,tegra234", "nvidia,tegra23x";
    fragment@100 {
        target = <&spi0>;
        __overlay__ {
            test = "success";
        };
    };
};

In the bitbake file, I've added the lines:

KERNEL_DEVICETREE_APPLY_OVERLAYS:append = " my_file.dtb"
TEGRA_PLUGIN_MANAGER_OVERLAYS:append = " my_file.dtb"

My recipe builds, and I can see the generated .dtbo file has been added to /boot/devicetree. However, the new key does not show up in the device tree. I'm sure that there's something simple that I'm missing, but I haven't been able to figure out what it is. Does this overlay need to be registered with tegraflash in order to be applied?

Thanks

[conradmenchine]

I missed an important note, which was that PREFERRED_PROVIDER_virtual/dtb and DTBFILE:<machine> need to be specified. I modified my file to look exactly like this example from the tegra-demo-distro, and it's working!