66 lines
2.1 KiB
Nix
66 lines
2.1 KiB
Nix
{ lib, stdenv, stdenvNoCC, dtc }:
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with lib; {
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# Compile single Device Tree overlay source
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# file (.dts) into its compiled variant (.dtb)
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compileDTS = ({
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name,
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dtsFile,
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includePaths ? [],
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extraPreprocessorFlags ? []
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}: stdenv.mkDerivation {
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inherit name;
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nativeBuildInputs = [ dtc ];
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buildCommand =
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let
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includeFlagsStr = lib.concatMapStringsSep " " (includePath: "-I${includePath}") includePaths;
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extraPreprocessorFlagsStr = lib.concatStringsSep " " extraPreprocessorFlags;
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in
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''
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$CC -E -nostdinc ${includeFlagsStr} -undef -D__DTS__ -x assembler-with-cpp ${extraPreprocessorFlagsStr} ${dtsFile} | \
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dtc -I dts -O dtb -@ -o $out
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'';
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});
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applyOverlays = (base: overlays': stdenvNoCC.mkDerivation {
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name = "device-tree-overlays";
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nativeBuildInputs = [ dtc ];
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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 2>/dev/null || true)
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# skip files without `compatible` string
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test -z "$dtbCompat" && continue
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${flip (concatMapStringsSep "\n") overlays (o: ''
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overlayCompat="$(fdtget -t s "${o.dtboFile}" / compatible)"
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# skip incompatible and non-matching overlays
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if [[ ! "$dtbCompat" =~ "$overlayCompat" ]]; then
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echo "Skipping overlay ${o.name}: incompatible with $(basename "$dtb")"
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elif ${if (o.filter == null) then "false" else ''
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[[ "''${dtb//${o.filter}/}" == "$dtb" ]]
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''}
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then
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echo "Skipping overlay ${o.name}: filter does not match $(basename "$dtb")"
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else
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echo -n "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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echo "ok"
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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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