31 lines
1.1 KiB
Nix
31 lines
1.1 KiB
Nix
# modification of nixpkgs deviceTree.applyOverlays to resolve https://github.com/NixOS/nixpkgs/issues/125354
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# https://github.com/NixOS/nixpkgs/blob/master/pkgs/os-specific/linux/device-tree/default.nix
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{ lib, pkgs, stdenvNoCC, dtc, libraspberrypi }:
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with lib; (base: overlays': stdenvNoCC.mkDerivation {
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name = "device-tree-overlays";
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nativeBuildInputs = [ dtc libraspberrypi ];
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buildCommand = let
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overlays = toList overlays';
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in ''
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mkdir -p $out
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cd ${base}
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find . -type f -name '*.dtb' -print0 \
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| xargs -0 cp -v --no-preserve=mode --target-directory $out --parents
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for dtb in $(find $out -type f -name '*.dtb'); do
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dtbCompat="$( fdtget -t s $dtb / compatible )"
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${flip (concatMapStringsSep "\n") overlays (o: ''
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overlayCompat="$( fdtget -t s ${o.dtboFile} / compatible )"
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# overlayCompat in dtbCompat
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if [[ "$dtbCompat" =~ "$overlayCompat" ]]; then
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echo "Applying overlay ${o.name} to $( basename $dtb )"
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mv $dtb{,.in}
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cp ${o.dtboFile}{,.dtbo}
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dtmerge "$dtb.in" "$dtb" ${o.dtboFile}.dtbo;
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rm $dtb.in ${o.dtboFile}.dtbo
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fi
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'')}
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done
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'';
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})
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