Padreug
082f738ffa
raspberry-pi-5.nix set `boot.kernelParams = lib.mkDefault [ "console=tty0" ]` to keep the serial console off the GPIO UART so a validator can own it. It never took effect: kernelParams is list-merged, and only definitions at the highest priority survive — nixpkgs defines loglevel/lsm at normal priority, so the mkDefault list was discarded wholesale. Effective params on rpi5-installed were `[ "loglevel=4" "lsm=landlock,yama,bpf" ]`, no console= at all, which makes the kernel fall back to the device tree's stdout-path: that same UART. Drop the mkDefault so the entry merges. Verified by evaluating config.boot.kernelParams before/after. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_013A6683cCHnQxFUosx1krY4
68 lines
3.2 KiB
Nix
68 lines
3.2 KiB
Nix
# Raspberry Pi 5 hardware module (aarch64).
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#
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# The bitSpire equivalent of upboard.nix, but for a Pi 5 instead of the x86
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# UP Board. Kernel, firmware, GPU and bootloader come from the nixos-hardware
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# `raspberry-pi-5` module (added alongside this one in flake.nix); here we set
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# only the bitSpire-specific hardware glue: serial for the bill validators,
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# the kiosk display driver, and no-suspend.
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#
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# Wiring the parts (see docs) to a Pi 5:
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# - Bill validators (Apex 7600 RS-232, NV10 USB+): easiest via one USB-serial
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# adapter each → stable /dev/ttyValidator* symlinks below. A GPIO-UART wire
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# is also supported (primary UART enabled, console kept off it).
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# - QR scanner: USB HID, no config.
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# - 7" touchscreen: DSI or HDMI; the vc4/v3d KMS driver (from nixos-hardware)
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# backs X.
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# - Boot/root: USB-SATA SSD or the SD card.
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{ config, lib, pkgs, ... }:
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{
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# aarch64 target. (The flake instantiates this config with aarch64 pkgs; this
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# line documents/asserts it.)
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nixpkgs.hostPlatform = lib.mkDefault "aarch64-linux";
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# Bootloader: the aarch64 sd-image uses the extlinux-compatible generator;
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# nixos-hardware's rpi5 module wires the firmware/u-boot. No systemd-boot
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# (that's x86/UEFI, as on the UP Board).
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boot.loader.grub.enable = lib.mkDefault false;
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boot.loader.generic-extlinux-compatible.enable = lib.mkDefault true;
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# Primary UART (GPIO 14/15) available for a GPIO-wired validator. Keep the
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# serial console OFF it so the validator owns the line — mirrors upboard.nix
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# keeping ttyS4 free for the dispenser. USB-serial adapters are unaffected.
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#
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# Not mkDefault: kernelParams is list-merged, and only definitions at the
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# highest priority survive. nixpkgs sets loglevel/lsm at normal priority, so
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# a mkDefault list here is dropped entirely — and with no console= at all
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# the kernel falls back to the device tree's stdout-path, i.e. this UART.
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boot.kernelParams = [ "console=tty0" ];
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# X uses the Pi GPU's kernel modesetting driver (vc4/v3d KMS from
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# nixos-hardware). Electron renders through it as on the UP Board.
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services.xserver.videoDrivers = lib.mkDefault [ "modesetting" ];
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hardware.enableRedistributableFirmware = true;
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# Kiosk: never sleep.
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systemd.targets = {
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sleep.enable = false;
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suspend.enable = false;
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hibernate.enable = false;
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hybrid-sleep.enable = false;
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};
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# Stable device symlinks for USB-serial bill-validator adapters, so the ATM
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# config can point at /dev/ttyValidator0 regardless of enumeration order.
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# Covers the common bridges (FTDI, Silicon Labs CP210x, WCH CH340). If two
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# adapters of the SAME chip are used, disambiguate by KERNELS/serial instead —
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# tune during bring-up. The NV10 USB+ presents its own USB CDC serial; add its
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# idVendor/idProduct here once known.
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services.udev.extraRules = lib.mkAfter ''
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# FTDI (e.g. FT232R) → ttyValidator0
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SUBSYSTEM=="tty", ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", SYMLINK+="ttyValidator0"
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# Silicon Labs CP210x → ttyValidator1
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SUBSYSTEM=="tty", ATTRS{idVendor}=="10c4", ATTRS{idProduct}=="ea60", SYMLINK+="ttyValidator1"
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# WCH CH340 → ttyValidator2
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SUBSYSTEM=="tty", ATTRS{idVendor}=="1a86", ATTRS{idProduct}=="7523", SYMLINK+="ttyValidator2"
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'';
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}
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