Raspberry Pi compute 4 - add I2C to device tree (solved)

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Hi! :wave:

Try with compatible = "brcm,bcm2711"; at the root of the overlay.

Our tooling may be needlessly strict about the compatible strings when applying overlays. This is something that needs to be investigated properly.

I also have to assume ads1113-overlay didn’t work.

        { name ="i2c1-overlay";
        dtsText =''
        /dts-v1/;
        /plugin/;

        / {
-                compatible = "brcm,bcm2835";
+                compatible = "brcm,bcm2711";

                fragment@0 {
                        target

You can check if the overlay applied (assuming you nixos-rebuild switch’d) by using:

 $ dtc /run/current-system/dtbs/broadcom/bcm2711-rpi-4-b.dtb

dtc automatically decompiles a dtb input. And our overlays are pre-applied on the dtb file.

You can also use dtc on the full path to the .dtb file for the system build if you nixos-rebuild build with a path like result/dtbs/....