Serial Console: Difference between revisions

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 In this case fixing the terminal size can be achieved by pressing R.
+== Serial Console Login ==
+There is a long thread here: https://github.com/NixOS/nixpkgs/issues/84105
+This configuration seems to work<syntaxhighlight lang="nix">
+#
+# serial-tty.nix
+#
+# Serial console configuration for /dev/ttyS0
+# Enables login via serial interface
+# https://github.com/NixOS/nixpkgs/blob/nixos-unstable/nixos/modules/services/ttys/getty.nix
+# https://github.com/NixOS/nixpkgs/issues/84105
+{ config, lib, pkgs, ... }:
+{
+  # Enable serial console on ttyS0
+  boot.kernelParams = [
+    "console=ttyS0,115200"
+  ];
+  # Disable the upstream getty module's automatic configuration for serial-getty@
+  # This prevents conflicts with our custom configuration
+  systemd.services."serial-getty@" = {
+    enable = false;
+  };
+  # Configure our own serial-getty@ttyS0 service
+  systemd.services."serial-getty@ttyS0" = {
+    enable = true;
+    wantedBy = [ "getty.target" ];
+    after = [ "systemd-user-sessions.service" ];
+    wants = [ "systemd-user-sessions.service" ];
+    serviceConfig = {
+      Type = "idle";
+      Restart = "always";
+      Environment = "TERM=vt220";
+      ExecStart = "${pkgs.util-linux}/bin/agetty --login-program ${pkgs.shadow}/bin/login --noclear --keep-baud ttyS0 115200,57600,38400,9600 vt220";
+      UtmpIdentifier = "ttyS0";
+      StandardInput = "tty";
+      StandardOutput = "tty";
+      TTYPath = "/dev/ttyS0";
+      TTYReset = "yes";
+      TTYVHangup = "yes";
+      IgnoreSIGPIPE = "no";
+      SendSIGHUP = "yes";
+    };
+  };
+  # Enable early console output during boot
+  #boot.consoleLogLevel = 7;  # Show all kernel messages
+  boot.initrd.verbose = true;  # Show initrd messages
+}
+</syntaxhighlight>