forked from mirrors/nixpkgs
6c9df40a4b
Now allows applying external overlays either in form of .dts file, literal dts context added to store or precompiled .dtbo. If overlays are defined, kernel device-trees are compiled with '-@' so the .dtb files contain symbols which we can reference in our overlays. Since `fdtoverlay` doesn't respect `/ compatible` by itself we query compatible strings of both `dtb` and `dtbo(verlay)` and apply only if latter is substring of the former. Also adds support for filtering .dtb files (as there are now nearly 1k dtbs). Co-authored-by: georgewhewell <georgerw@gmail.com> Co-authored-by: Kai Wohlfahrt <kai.wohlfahrt@gmail.com>
33 lines
978 B
Nix
33 lines
978 B
Nix
{ stdenvNoCC, dtc, findutils }:
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with stdenvNoCC.lib; {
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applyOverlays = (base: overlays': stdenvNoCC.mkDerivation {
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name = "device-tree-overlays";
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nativeBuildInputs = [ dtc findutils ];
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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 $dtb{,.in}
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fdtoverlay -o "$dtb" -i "$dtb.in" ${o.dtboFile};
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rm $dtb.in
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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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}
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