kernel: enable magic sysrq

This can be useful via /proc/sysrq-trigger or by sending a break on
the serial.

devices/cudy-x6/default.nix

@@ -0,0 +1,234 @@
+{
+  system = {
+    crossSystem = {
+      config = "mipsel-unknown-linux-musl";
+      gcc = {
+        abi = "32";
+        arch = "mips32";          # mips32r2?
+      };
+    };
+  };
+
+  description = ''
+    Cudy X6
+    ********************
+
+    Zyxel NWA50AX is quite close to the GL-MT300N-v2 "Mango" device, but it is based on the MT7621
+    chipset instead of the MT7628.
+
+    Installation
+    ============
+
+  '';
+
+  module = { pkgs, config, lib, lim, ...}:
+    let
+      inherit (pkgs.liminix.networking) interface;
+      inherit (pkgs.liminix.services) oneshot;
+      inherit (pkgs.pseudofile) dir symlink;
+      inherit (pkgs) openwrt;
+
+      mac80211 = pkgs.mac80211.override {
+        drivers = [ "mt7915e" ];
+        klibBuild = config.system.outputs.kernel.modulesupport;
+      };
+      # v204520220929
+      wlan_firmware = pkgs.fetchurl {
+        url = "https://github.com/openwrt/mt76/raw/1b88dd07f153b202e57fe29734806744ed006b0e/firmware/mt7915_wa.bin";
+        hash = "sha256-wooyefzb0i8640+lwq3vNhcBXRFCtGuo+jiL7afZaKA=";
+      };
+      wlan_firmware' = pkgs.fetchurl {
+        url = "https://github.com/openwrt/mt76/raw/1b88dd07f153b202e57fe29734806744ed006b0e/firmware/mt7915_wm.bin";
+        hash = "sha256-k62nQewRuKjBLd5R3RxU4F74YKnQx5zr6gqMMImqVQw=";
+      };
+      wlan_firmware'' = pkgs.fetchurl {
+        url = "https://github.com/openwrt/mt76/raw/1b88dd07f153b202e57fe29734806744ed006b0e/firmware/mt7915_rom_patch.bin";
+        hash = "sha256-ifriAjWzFACrxVWCANZpUaEZgB/0pdbhnTVQytx6ddg=";
+      };
+    in {
+      imports = [
+        # We include it to ensure the bridge functionality
+        # is available on the target kernel.
+        ../../modules/bridge
+        ../../modules/arch/mipsel.nix
+        ../../modules/outputs/tftpboot.nix
+        ../../modules/outputs/mtdimage.nix
+      ];
+
+      filesystem = dir {
+        lib = dir {
+          firmware = dir {
+            mediatek = dir {
+              "mt7915_wa.bin" = symlink wlan_firmware;
+              "mt7915_wm.bin" = symlink wlan_firmware';
+              "mt7915_rom_patch.bin" = symlink wlan_firmware'';
+            };
+          };
+        };
+      };
+
+      hardware = {
+        rootDevice = "/dev/mtdblock5";
+
+        defaultOutput = "mtdimage";
+
+        loadAddress = lim.parseInt "0x80001000";
+        entryPoint = lim.parseInt "0x80001000";
+        # Aligned on 2kb.
+        alignment = 2048;
+
+        flash = {
+          address = lim.parseInt "0xbc050000";
+          eraseBlockSize = 65536;
+          size = lim.parseInt "0x1F80000";
+        };
+
+        dts = {
+          src = "${openwrt.src}/target/linux/ramips/dts/mt7621_cudy_x6-v1.dts";
+          includes = [
+            "${openwrt.src}/target/linux/ramips/dts"
+          ];
+        };
+        networkInterfaces =
+          let
+            inherit (config.system.service.network) link;
+          in {
+            wan = link.build { ifname = "wan"; };
+            lan1 = link.build { ifname = "lan1"; };
+            lan2 = link.build { ifname = "lan2"; };
+            lan3 = link.build { ifname = "lan3"; };
+            lan4 = link.build { ifname = "lan4"; };
+            wlan0 = link.build {
+              ifname = "wlan0";
+              dependencies = [ mac80211 ];
+            };
+            wlan1 = link.build {
+              ifname = "wlan1";
+              dependencies = [ mac80211 ];
+            };
+          };
+      };
+
+      boot = {
+        imageFormat = "fit";
+        tftp = {
+          # 5MB is nice.
+          freeSpaceBytes = 5 * 1024 * 1024;
+          loadAddress = lim.parseInt "0x2000000";
+        };
+      };
+
+      kernel = {
+        src = pkgs.fetchurl {
+          name = "linux.tar.gz";
+          url = "https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.15.137.tar.gz";
+          hash = "sha256-PkdzUKZ0IpBiWe/RS70J76JKnBFzRblWcKlaIFNxnHQ=";
+        };
+        extraPatchPhase = ''
+          ${openwrt.applyPatches.ramips}
+
+        '';
+        config = {
+
+          RALINK = "y";
+          PCI = "y";
+          PHY_MT7621_PCI = "y";
+          PCIE_MT7621 = "y";
+          SOC_MT7621 = "y";
+          CLK_MT7621 = "y";
+          CLOCKSOURCE_WATCHDOG = "y";
+
+          SERIAL_8250_CONSOLE = "y";
+          SERIAL_8250 = "y";
+          SERIAL_CORE_CONSOLE = "y";
+          SERIAL_OF_PLATFORM = "y";
+          SERIAL_8250_NR_UARTS = "3";
+          SERIAL_8250_RUNTIME_UARTS = "3";
+          SERIAL_MCTRL_GPIO = "y";
+
+          CONSOLE_LOGLEVEL_DEFAULT = "8";
+          CONSOLE_LOGLEVEL_QUIET = "4";
+
+          # MTD_UBI_BEB_LIMIT = "20";
+          # MTD_UBI_WL_THRESHOLD = "4096";
+
+          MTD = "y";
+          MTD_BLOCK = "y";          # fix undefined ref to register_mtd_blktrans_dev
+          MTD_RAW_NAND = "y";
+          MTD_NAND_MT7621 = "y";
+          MTD_NAND_MTK_BMT = "y";      # Bad-block Management Table
+          MTD_NAND_ECC_SW_HAMMING= "y";
+          MTD_SPI_NAND= "y";
+          MTD_OF_PARTS = "y";
+          MTD_NAND_CORE= "y";
+          MTD_SPLIT_FIRMWARE= "y";
+          MTD_SPLIT_FIT_FW= "y";
+
+          PINCTRL = "y";
+          PINCTRL_MT7621 = "y";
+
+          I2C = "y";
+          I2C_MT7621 = "y";
+
+          SPI = "y";
+          MTD_SPI_NOR = "y";
+          SPI_MT7621 = "y";
+          SPI_MASTER = "y";
+          SPI_MEM = "y";
+
+          REGULATOR = "y";
+          REGULATOR_FIXED_VOLTAGE = "y";
+          RESET_CONTROLLER = "y";
+          POWER_RESET = "y";
+          POWER_RESET_GPIO = "y";
+          POWER_SUPPLY = "y";
+          LED_TRIGGER_PHY = "y";
+
+          PCI_DISABLE_COMMON_QUIRKS = "y";
+          PCI_DOMAINS = "y";
+          PCI_DOMAINS_GENERIC = "y";
+          PCI_DRIVERS_GENERIC = "y";
+          PCS_MTK_LYNXI = "y";
+
+          SOC_BUS = "y";
+
+          NET = "y";
+          ETHERNET = "y";
+          WLAN = "y";
+
+          PHYLIB = "y";
+          AT803X_PHY = "y";
+          FIXED_PHY = "y";
+          GENERIC_PHY = "y";
+          NET_DSA = "y";
+          NET_DSA_MT7530 = "y";
+          NET_DSA_MT7530_MDIO = "y";
+          NET_DSA_TAG_MTK = "y";
+          NET_MEDIATEK_SOC = "y";
+          NET_SWITCHDEV = "y";
+          NET_VENDOR_MEDIATEK = "y";
+
+          SWPHY = "y";
+
+          GPIOLIB = "y";
+          GPIO_MT7621 = "y";
+          OF_GPIO = "y";
+
+          EARLY_PRINTK = "y";
+
+          NEW_LEDS = "y";
+          LEDS_TRIGGERS = "y";
+          LEDS_CLASS = "y";         # required by rt2x00lib
+          LEDS_CLASS_MULTICOLOR = "y";
+          LEDS_BRIGHTNESS_HW_CHANGED = "y";
+
+          PRINTK_TIME = "y";
+        } // lib.optionalAttrs (config.system.service ? vlan) {
+          SWCONFIG = "y";
+        } // lib.optionalAttrs (config.system.service ? watchdog) {
+          RALINK_WDT = "y";  # watchdog
+          MT7621_WDT = "y";  # or it might be this one
+        };
+      };
+    };
+}

modules/hostapd/service.nix

@@ -7,7 +7,7 @@
 { interface, params} :
 let
   inherit (liminix.services) longrun;
-  inherit (lib) concatStringsSep mapAttrsToList;
+  inherit (lib) concatStrings mapAttrsToList;
   inherit (liminix.lib) typeChecked;
   inherit (lib) mkOption types;
 
@@ -22,15 +22,14 @@ let
     driver = "nl80211";
     logger_syslog = "-1";
     logger_syslog_level = 1;
-    ctrl_interface = "/run/hostapd";
+    ctrl_interface = "/run/hostapd.${name}";
     ctrl_interface_group = 0;
   };
 
   conf = writeText "hostapd.conf"
-    (concatStringsSep
-      "\n"
+    (concatStrings
       (mapAttrsToList
-        (name: value: "${name}=${toString value}")
+        (name: value: "${name}=${toString value}\n")
         (defaults // params)));
 in longrun {
   inherit name;

modules/kernel/default.nix

@@ -131,6 +131,8 @@ in {
         # at boot time unless we disable trying to call it.
         # https://lkml.org/lkml/2013/8/5/175
         FW_LOADER_USER_HELPER = "n";
+
+        MAGIC_SYSRQ = "y";
       };
     };
   };