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raspberry-pi/common: fix firmware install when cross-compiling

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This commit is contained in:
Jamie Magee 2026-07-12 23:02:21 -07:00
parent 8efb4337e8
commit f185edb4e9
1 changed files with 69 additions and 63 deletions
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132
raspberry-pi/common/firmware.nix
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@ -24,81 +24,87 @@ let
# install-rpi-firmware <target-dir> # install-rpi-firmware <target-dir>
# Idempotent: copies via temp file + rename, and prunes stale DTBs/overlays. # Idempotent: copies via temp file + rename, and prunes stale DTBs/overlays.
installScript = pkgs.writeShellApplication { mkInstallScript =
name = "install-rpi-firmware"; scriptPkgs:
runtimeInputs = [ pkgs.coreutils ]; scriptPkgs.writeShellApplication {
text = '' name = "install-rpi-firmware";
target="$1" runtimeInputs = [ scriptPkgs.coreutils ];
shopt -s nullglob text = ''
target="$1"
shopt -s nullglob
firmwareBoot=${cfg.package}/share/raspberrypi/boot firmwareBoot=${cfg.package}/share/raspberrypi/boot
${ ${
if cfg.useGenerationDeviceTree then if cfg.useGenerationDeviceTree then
'' ''
# Prefer the booted generation's device trees over the vendor ones. # Prefer the booted generation's device trees over the vendor ones.
dtbSrc=/run/current-system/dtbs dtbSrc=/run/current-system/dtbs
[ -d "$dtbSrc" ] || dtbSrc=$firmwareBoot [ -d "$dtbSrc" ] || dtbSrc=$firmwareBoot
'' ''
else else
'' ''
dtbSrc=$firmwareBoot dtbSrc=$firmwareBoot
'' ''
} }
mkdir -p "$target/overlays" mkdir -p "$target/overlays"
# Copy via a temp file then rename so an interrupted run can't leave a # Copy via a temp file then rename so an interrupted run can't leave a
# half-written file behind. The firmware partition is FAT, so the rename # half-written file behind. The firmware partition is FAT, so the rename
# isn't truly atomic, but it still beats a partial copy when the # isn't truly atomic, but it still beats a partial copy when the
# activation script rewrites the partition on a live system. # activation script rewrites the partition on a live system.
copyForced() { copyForced() {
cp "$1" "$2.tmp" cp "$1" "$2.tmp"
mv "$2.tmp" "$2" mv "$2.tmp" "$2"
} }
# Track every file we copy this run, keyed by destination path, so the # Track every file we copy this run, keyed by destination path, so the
# prune step below can delete stale device trees / overlays left behind # prune step below can delete stale device trees / overlays left behind
# by a previous generation. # by a previous generation.
declare -A kept declare -A kept
echo "rpi-firmware: copying device trees from $dtbSrc" echo "rpi-firmware: copying device trees from $dtbSrc"
for dtb in "$dtbSrc"/*.dtb "$dtbSrc"/broadcom/*.dtb; do for dtb in "$dtbSrc"/*.dtb "$dtbSrc"/broadcom/*.dtb; do
dst="$target/$(basename "$dtb")" dst="$target/$(basename "$dtb")"
copyForced "$dtb" "$dst" copyForced "$dtb" "$dst"
kept[$dst]=1
done
if [ -d "$dtbSrc/overlays" ]; then
for ovr in "$dtbSrc"/overlays/*; do
dst="$target/overlays/$(basename "$ovr")"
copyForced "$ovr" "$dst"
kept[$dst]=1 kept[$dst]=1
done done
fi
# Prune stale device trees / overlays. if [ -d "$dtbSrc/overlays" ]; then
for fn in "$target"/*.dtb "$target"/overlays/*; do for ovr in "$dtbSrc"/overlays/*; do
if [ "''${kept[$fn]:-}" != 1 ]; then dst="$target/overlays/$(basename "$ovr")"
rm -v -- "$fn" copyForced "$ovr" "$dst"
kept[$dst]=1
done
fi fi
done
echo "rpi-firmware: copying GPU boot code" # Prune stale device trees / overlays.
for src in "$firmwareBoot"/bootcode.bin "$firmwareBoot"/start*.elf "$firmwareBoot"/fixup*.dat; do for fn in "$target"/*.dtb "$target"/overlays/*; do
copyForced "$src" "$target/$(basename "$src")" if [ "''${kept[$fn]:-}" != 1 ]; then
done rm -v -- "$fn"
fi
done
${lib.optionalString cfg.uboot.enable '' echo "rpi-firmware: copying GPU boot code"
echo "rpi-firmware: copying U-Boot" for src in "$firmwareBoot"/bootcode.bin "$firmwareBoot"/start*.elf "$firmwareBoot"/fixup*.dat; do
copyForced ${cfg.uboot.package}/u-boot.bin "$target/u-boot.bin" copyForced "$src" "$target/$(basename "$src")"
''} done
echo "rpi-firmware: copying config.txt" ${lib.optionalString cfg.uboot.enable ''
copyForced ${config.hardware.raspberry-pi.configtxt.file} "$target/config.txt" echo "rpi-firmware: copying U-Boot"
copyForced ${cfg.uboot.package}/u-boot.bin "$target/u-boot.bin"
''}
echo "rpi-firmware: done ($target)" echo "rpi-firmware: copying config.txt"
''; copyForced ${config.hardware.raspberry-pi.configtxt.file} "$target/config.txt"
};
echo "rpi-firmware: done ($target)"
'';
};
# Target tools for activation, build tools for images.
installScript = mkInstallScript pkgs;
imageInstallScript = mkInstallScript pkgs.buildPackages;
in in
{ {
options.hardware.raspberry-pi.firmware = { options.hardware.raspberry-pi.firmware = {
@ -189,7 +195,7 @@ in
# sd-image module is imported. mkForce so we override (not merge with) # sd-image module is imported. mkForce so we override (not merge with)
# sd-image-aarch64.nix, which also sets this and would clobber config.txt. # sd-image-aarch64.nix, which also sets this and would clobber config.txt.
(lib.optionalAttrs (options ? sdImage) { (lib.optionalAttrs (options ? sdImage) {
sdImage.populateFirmwareCommands = lib.mkForce "${lib.getExe installScript} ./firmware\n"; sdImage.populateFirmwareCommands = lib.mkForce "${lib.getExe imageInstallScript} ./firmware\n";
}) })
(lib.mkIf cfg.enable { (lib.mkIf cfg.enable {
system.activationScripts.raspberry-pi-firmware = lib.stringAfter [ "specialfs" ] '' system.activationScripts.raspberry-pi-firmware = lib.stringAfter [ "specialfs" ] ''