hansmbakker Posted January 29, 2021 Posted January 29, 2021 I am trying to convert this dts file into a user-provided overlay. I have a work-in-progress, but I'm running into the issue that some labels seem not available to reference with the "&" operator. Specifically - the uart2 label seems not possible to reference. Maybe there are more compile errors in my code, but dtc only gives errors one by one... I tried decompiling the current device tree using dtc -I fs -O dts /sys/firmware/devicetree/base There the uart2 label seems missing in that output. I tried whether creating an alias for the path found in the current device tree, but that also didn't help: uart2 = "/soc/serial@1c28800"; The compile error I got is this: nanopineo:overlay:% dtc -@ -q -I dts -O dtb -o test.dtbo ./overlay.dts test.dtbo: ERROR (path_references): Reference to non-existent node or label "uart2" ERROR: Input tree has errors, aborting (use -f to force output) I am wondering these things: - how to know what labels are available to reference? - the source of the precompiled uart2 overlay seems to reference &uart2, why can't I reference it from a user-provided overlay? - if the uart2 label is lost in compilation, how can I write a user-provided overlay for uart2? Link to file I'm trying to convert to an overlay Link to my work in progress Device: NanoPi Neo Distribution: Armbian Bionic
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