{
  description = ''
    TP-Link Archer AX23 / AX1800 Dual Band Wi-Fi 6 Router
    *****************************************************

    Hardware summary
    ================

    - MediaTek MT7621 (880MHz)
    - 16MB Flash
    - 128MB RAM
    - WLan hardware: Mediatek MT7905, MT7975
  '';

  system = {
    crossSystem = {
      config = "mips-unknown-linux-musl";
    };
  };

  module = {pkgs, config, lib, lim, ... }:
    let firmware = pkgs.stdenv.mkDerivation {
          name = "wlan-firmware";
          phases = ["installPhase"];
          installPhase = ''
            mkdir $out
            cp ${pkgs.linux-firmware}/lib/firmware/mediatek/{mt7915,mt7615,mt7622}* $out
          '';
        };
    in {
      imports = [
        ../../modules/arch/mips.nix
        ../../modules/outputs/tftpboot.nix
        ../../modules/outputs/ubifs.nix
      ];
      config = {
        kernel = {
          src = pkgs.pkgsBuildBuild.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 = ''
            ${pkgs.openwrt.applyPatches.ramips}
          '';
          config = {
        # Taken from the rt3200 and gl-mt300n
        RALINK="y";
        PCI = "y";
        SOC_MT7620="y";

        # needed for "Cannot find regmap for /infracfg@10000000"
        MFD_SYSCON = "y";

        PM_CLK="y";

        REGMAP_MMIO = "y";
        CLKSRC_MMIO = "y";
        REGMAP = "y";

        MEDIATEK_GE_PHY = "y";
        # MEDIATEK_MT6577_AUXADC = "y";
        # MEDIATEK_WATCHDOG = "y";
        NET_MEDIATEK_SOC = "y";
        NET_MEDIATEK_STAR_EMAC = "y"; # this enables REGMAP_MMIO
        NET_VENDOR_MEDIATEK = "y";

        BLOCK = "y"; # move this to base option

        SPI_MASTER = "y";
        SPI = "y";
        SPI_MEM="y";

        MTD = "y";
        MTD_BLOCK = "y";
        MTD_RAW_NAND = "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_SPI_NOR= "y";
        MTD_SPLIT_FIRMWARE= "y";
        MTD_SPLIT_FIT_FW= "y";


        MMC = "y";
        MMC_BLOCK = "y";
        MMC_CQHCI = "y";
        MMC_MTK = "y";

        # Distributed Switch Architecture is needed
        # to make the ethernet ports visible
        NET_DSA="y";
        NET_DSA_MT7530="y";
        NET_DSA_TAG_MTK="y";

        PSTORE = "y";
        PSTORE_RAM = "y";
        PSTORE_CONSOLE = "y";
        PSTORE_DEFLATE_COMPRESS = "n";

        GPIOLIB="y";
        GPIO_MT7621 = "y";
        PINCTRL="y";
        ETHERNET="y";

        SERIAL_8250 = "y";
        SERIAL_8250_CONSOLE = "y";
        # SERIAL_8250_NR_UARTS="3";
        # SERIAL_8250_RUNTIME_UARTS="3";
        SERIAL_CORE_CONSOLE = "y";
        SERIAL_OF_PLATFORM="y";
          } // lib.optionalAttrs (config.system.service ? watchdog) {
          RALINK_WDT = "y";  # watchdog
          MT7621_WDT = "y";  # or it might be this one
        };
        };
        boot = {
          commandLine = [ "console=ttyS0,115200" ];
          tftp = {
            #ipaddr = "10.0.0.8"; # router address
            #serverip = "10.0.0.1"; # build machine or other tftp server
            # Should be a segment of free RAM, where the tftp artifact
            # can be stored before unpacking it to the 'hardware.loadAddress'
            # The 'hardware.loadAddress' is 0x80001000, which suggests the
            # RAM would start at 0x8000000 and (being 128MB) go to
            # to 0x8800000. Let's put it at the 100MB mark at
            # 0x8000000+0x0640000=0x86400000
            loadAddress = lim.parseInt "0x86400000";
          };
        };
        filesystem =
        let inherit (pkgs.pseudofile) dir symlink;
             in
               dir {
                 lib = dir {
                   firmware = dir {
                     mediatek = symlink firmware;
                   };
                 };
               };

      hardware =
        let
          openwrt = pkgs.openwrt;
          mac80211 =  pkgs.mac80211.override {
            drivers = [
              "mt7615e"
              "mt7915e"
            ];
            klibBuild = config.system.outputs.kernel.modulesupport;
          };
        in {
          #ubi = {
          #  # TODO how to determine?
          #  minIOSize = "2048";
          #  # TODO how to determine?
          #  eraseBlockSize = "126976";
          #  # TODO how to determine?
          #  maxLEBcount = "1024"; # guessing
          #};
          # from OEM bootlog (openwrt wiki):
          # 4 cmdlinepart partitions found on MTD device raspi
          # Creating 4 MTD partitions on "raspi":
          # 0x000000000000-0x000000040000 : "uboot"
          # 0x000000040000-0x000000440000 : "uImage"
          # 0x000000440000-0x000000ff0000 : "rootfs"
          # 0x000000ff0000-0x000001000000 : "ART"
          # from openwrt bootlog (openwrt wiki):
          # 5 fixed-partitions partitions found on MTD device spi0.0
          # OF: Bad cell count for /palmbus@1e000000/spi@b00/flash@0/partitions
          # OF: Bad cell count for /palmbus@1e000000/spi@b00/flash@0/partitions
          # OF: Bad cell count for /palmbus@1e000000/spi@b00/flash@0/partitions
          # OF: Bad cell count for /palmbus@1e000000/spi@b00/flash@0/partitions
          # Creating 5 MTD partitions on "spi0.0":
          # 0x000000000000-0x000000040000 : "u-boot"
          # 0x000000040000-0x000000fa0000 : "firmware"
          # 2 uimage-fw partitions found on MTD device firmware
          # Creating 2 MTD partitions on "firmware":
          # 0x000000000000-0x0000002c0000 : "kernel"
          # 0x0000002c0000-0x000000f60000 : "rootfs"
          # mtd: setting mtd3 (rootfs) as root device
          # 1 squashfs-split partitions found on MTD device rootfs
          # 0x000000640000-0x000000f60000 : "rootfs_data"
          # 0x000000fa0000-0x000000fb0000 : "config"
          # 0x000000fb0000-0x000000ff0000 : "tplink"
          # 0x000000ff0000-0x000001000000 : "radio"
          flash = {
            # from the OEM bootlog 'Booting image at bc040000'
            # (0x40000 from 0xbc000000)
            address = lim.parseInt "0xbc040000";
            # 0x000000040000-0x000000fa0000
            size = lim.parseInt "0xf60000";
            # TODO how to determine?
            eraseBlockSize = 65536;
          };

          # since this is mentioned in the partition table as well?
          defaultOutput = "uimage";
          # taken from openwrt sysupgrade image:
          # openwrt-23.05.2-ramips-mt7621-tplink_archer-ax23-v1-squashfs-sysupgrade.bin: u-boot legacy uImage, MIPS OpenWrt Linux-5.15.137, Linux/MIPS, OS Kernel Image (lzma), 2797386 bytes, Tue Nov 14 13:38:11 2023, Load Address: 0X80001000, Entry Point: 0X80001000, Header CRC: 0X19F74C5B, Data CRC: 0XF685563C
          loadAddress = lim.parseInt "0x80001000";
          entryPoint = lim.parseInt "0x80001000";
          rootDevice = "ubi0:liminix";
          dts = {
            src = "${openwrt.src}/target/linux/ramips/dts/mt7621_tplink_archer-ax23-v1.dts";
            includes =  [
              "${openwrt.src}/target/linux/ramips/dts"
              "${config.system.outputs.kernel.modulesupport}/arch/arm64/boot/dts/mediatek/"
            ];
          };

          networkInterfaces =
            let
              inherit (config.system.service.network) link;
              inherit (config.system.service) bridge;
            in rec {
              lan1 = link.build { ifname = "lan1"; };
              lan2 = link.build { ifname = "lan2"; };
              lan3 = link.build { ifname = "lan3"; };
              lan4 = link.build { ifname = "lan4"; };

              wan = link.build {
                ifname = "wan";
                dependencies = [ mac80211 ];
              };
            };
        };
    };
    };
}