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doc fix

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Bryan Ramos 2026-04-19 20:28:02 -04:00
parent 59347ec620
commit 9926a17d04
1 changed files with 16 additions and 11 deletions
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27
system/machines/tv/hardware.nix
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@ -18,17 +18,22 @@
};
};
# The nixos-hardware Pi 4 profile ships a base DTB with gpu/v3d/hdmi nodes
# all status="disabled". The `vc4-kms-v3d.dtbo` overlay flips them on — but
# U-Boot (NixOS's bootloader path on aarch64 Pi) bypasses the Pi firmware's
# config.txt dtoverlay mechanism. Apply the overlay at NixOS build time so
# it's baked into the DTB U-Boot hands to the kernel.
hardware.deviceTree.overlays = [
{
name = "vc4-kms-v3d";
dtboFile = "${config.boot.kernelPackages.kernel}/dtbs/overlays/vc4-kms-v3d.dtbo";
}
];
# Pi 4 GPU acceleration. Per the NixOS wiki, two options are needed:
# fkms-3d -> enables the fake-KMS + V3D renderer overlay
# apply-overlays-dtmerge -> activates the dtmerge-based overlay pipeline
# Without apply-overlays-dtmerge, hardware.deviceTree.overlays entries are
# silently ignored — they show up in the evaluated config but never get
# merged into the emitted DTB.
# https://wiki.nixos.org/wiki/NixOS_on_ARM/Raspberry_Pi_4
hardware.raspberry-pi."4" = {
fkms-3d.enable = true;
apply-overlays-dtmerge.enable = true;
};
hardware.deviceTree = {
enable = true;
filter = "*rpi-4-*.dtb";
};
# UUIDs are baked into the Hydra SD image — identical on every Pi flashed
# from that image. FIRMWARE (FAT) holds the Pi bootloader; NIXOS_SD (ext4)