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>
32 lines
978 B
Nix
32 lines
978 B
Nix
{ stdenvNoCC, dtc, findutils }:
|
|
|
|
with stdenvNoCC.lib; {
|
|
applyOverlays = (base: overlays': stdenvNoCC.mkDerivation {
|
|
name = "device-tree-overlays";
|
|
nativeBuildInputs = [ dtc findutils ];
|
|
buildCommand = let
|
|
overlays = toList overlays';
|
|
in ''
|
|
mkdir -p $out
|
|
cd ${base}
|
|
find . -type f -name '*.dtb' -print0 \
|
|
| xargs -0 cp -v --no-preserve=mode --target-directory $out --parents
|
|
|
|
for dtb in $(find $out -type f -name '*.dtb'); do
|
|
dtbCompat="$( fdtget -t s $dtb / compatible )"
|
|
|
|
${flip (concatMapStringsSep "\n") overlays (o: ''
|
|
overlayCompat="$( fdtget -t s ${o.dtboFile} / compatible )"
|
|
# overlayCompat in dtbCompat
|
|
if [[ "$dtbCompat" =~ "$overlayCompat" ]]; then
|
|
echo "Applying overlay ${o.name} to $( basename $dtb )"
|
|
mv $dtb{,.in}
|
|
fdtoverlay -o "$dtb" -i "$dtb.in" ${o.dtboFile};
|
|
rm $dtb.in
|
|
fi
|
|
'')}
|
|
|
|
done
|
|
'';
|
|
});
|
|
}
|