{
  description = ''
    TP-Link Archer C7 1.1
    *********************

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

    - Qualcomm Atheros QCA9558 ver 1 rev 0 (720MHz, MIPS 74Kc)
    - 8MB Flash
    - 128MB RAM
    - WLan hardware: Qualcomm Atheros QCA9558, Qualcomm Atheros QCA9880-AR1A

    Limitations
    ===========

      5G is not supported on the v1 revision

      ath10k may cause a bootloop, build without ath10k there
  '';

  system = {
    crossSystem = {
      config = "mips-unknown-linux-musl";
      gcc = {
        abi = "32";
        arch = "74kc";
      };
    };
  };

  module = {pkgs, config, lib, lim, ... }:
    let firmware = pkgs.stdenv.mkDerivation {
          name = "wlan-firmware";
          phases = ["installPhase"];
          installPhase = ''
            mkdir $out
            cp -r ${pkgs.linux-firmware}/lib/firmware/ath10k/QCA988X $out
          '';
        };
    in {
      imports = [
        ../../modules/arch/mips.nix
        ../../modules/outputs/tftpboot.nix
        ../../modules/outputs/jffs2.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.ath79}
          '';
          config = {
            # Initially taken from openwrt's ./target/linux/ath79/config-5.15,
            # then tweaked here and there
            AG71XX="y";
            AG71XX_DEBUG_FS="y";
            AR8216_PHY="y";
            #AR8216_PHY_LEDS="y";
            ARCH_32BIT_OFF_T="y";
            ARCH_HIBERNATION_POSSIBLE="y";
            ARCH_KEEP_MEMBLOCK="y";
            ARCH_MMAP_RND_BITS_MAX="15";
            ARCH_MMAP_RND_COMPAT_BITS_MAX="15";
            ARCH_SUSPEND_POSSIBLE="y";
            AT803X_PHY="y";
            ATH79="y";
            WATCHDOG="y";
            ATH79_WDT="y";
            BLK_MQ_PCI="y";
            CEVT_R4K="y";
            CLONE_BACKWARDS="y";
            #CMDLINE="rootfstype=squashfs,jffs2";
            CMDLINE_BOOL="y";
            COMMON_CLK="y";
            COMPAT_32BIT_TIME="y";
            CPU_BIG_ENDIAN="y";
            CPU_GENERIC_DUMP_TLB="y";
            CPU_HAS_DIEI="y";
            CPU_HAS_PREFETCH="y";
            CPU_HAS_RIXI="y";
            CPU_HAS_SYNC="y";
            CPU_MIPS32="y";
            CPU_MIPS32_R2="y";
            CPU_MIPSR2="y";
            CPU_NEEDS_NO_SMARTMIPS_OR_MICROMIPS="y";
            CPU_R4K_CACHE_TLB="y";
            CPU_SUPPORTS_32BIT_KERNEL="y";
            CPU_SUPPORTS_HIGHMEM="y";
            CPU_SUPPORTS_MSA="y";
            #CRYPTO_BLAKE2S="y";
            CRYPTO_LIB_BLAKE2S_GENERIC="y";
            CRYPTO_LIB_POLY1305_RSIZE="2";
            CRYPTO_RNG2="y";
            CSRC_R4K="y";
            DMA_NONCOHERENT="y";
            DTC="y";
            EARLY_PRINTK="y";
            FIXED_PHY="y";
            FWNODE_MDIO="y";
            FW_LOADER_PAGED_BUF="y";
            GENERIC_ATOMIC64="y";
            GENERIC_CLOCKEVENTS="y";
            GENERIC_CMOS_UPDATE="y";
            GENERIC_CPU_AUTOPROBE="y";
            GENERIC_FIND_FIRST_BIT="y";
            GENERIC_GETTIMEOFDAY="y";
            GENERIC_IOMAP="y";
            GENERIC_IRQ_CHIP="y";
            GENERIC_IRQ_EFFECTIVE_AFF_MASK="y";
            GENERIC_IRQ_SHOW="y";
            GENERIC_LIB_ASHLDI3="y";
            GENERIC_LIB_ASHRDI3="y";
            GENERIC_LIB_CMPDI2="y";
            GENERIC_LIB_LSHRDI3="y";
            GENERIC_LIB_UCMPDI2="y";
            GENERIC_PCI_IOMAP="y";
            GENERIC_PHY="y";
            #GENERIC_PINCONF="y";
            #GENERIC_PINCTRL_GROUPS="y";
            #GENERIC_PINMUX_FUNCTIONS="y";
            GENERIC_SCHED_CLOCK="y";
            GENERIC_SMP_IDLE_THREAD="y";
            GENERIC_TIME_VSYSCALL="y";
            GPIOLIB_IRQCHIP="y";
            GPIO_74X164="y";
            GPIO_ATH79="y";
            GPIO_CDEV="y";
            GPIO_GENERIC="y";
            HANDLE_DOMAIN_IRQ="y";
            HARDWARE_WATCHPOINTS="y";
            HAS_DMA="y";
            HAS_IOMEM="y";
            HAS_IOPORT_MAP="y";
            HZ_PERIODIC="y";
            #IMAGE_CMDLINE_HACK="y";
            #INITRAMFS_SOURCE="";
            IRQCHIP="y";
            IRQ_DOMAIN="y";
            IRQ_FORCED_THREADING="y";
            IRQ_MIPS_CPU="y";
            IRQ_WORK="y";
            #LEDS_GPIO="y";
            LIBFDT="y";
            LOCK_DEBUGGING_SUPPORT="y";
            MDIO_BITBANG="y";
            MDIO_BUS="y";
            MDIO_DEVICE="y";
            MDIO_DEVRES="y";
            MDIO_GPIO="y";
            MEMFD_CREATE="y";
            MFD_SYSCON="y";
            MIGRATION="y";
            MIPS="y";
            MIPS_ASID_BITS="8";
            MIPS_ASID_SHIFT="0";
            MIPS_CLOCK_VSYSCALL="y";
            #MIPS_CMDLINE_FROM_DTB="y";
            #MIPS_EBPF_JIT="y";
            MIPS_L1_CACHE_SHIFT="5";
            MIPS_LD_CAN_LINK_VDSO="y";
            #MIPS_RAW_APPENDED_DTB="y";
            MIPS_SPRAM="y";
            MODULES_USE_ELF_REL="y";
            MTD_CFI="y";
            MTD_GEN_PROBE="y";
            MTD_CFI_ADV_OPTIONS="y";
            MTD_CFI_GEOMETRY="y";
            MTD_CMDLINE_PARTS="y";
            MTD_PARSER_CYBERTAN="y";
            MTD_PHYSMAP="y";
            MTD_SPI_NOR="y";
            MTD_SPLIT_ELF_FW="y";
            MTD_SPLIT_LZMA_FW="y";
            MTD_SPLIT_SEAMA_FW="y";
            MTD_SPLIT_TPLINK_FW="y";
            MTD_SPLIT_UIMAGE_FW="y";
            MTD_SPLIT_WRGG_FW="y";
            MTD_VIRT_CONCAT="y";
            NEED_DMA_MAP_STATE="y";
            NEED_PER_CPU_KM="y";
            NET_SELFTESTS="y";
            NO_GENERIC_PCI_IOPORT_MAP="y";
            NVMEM="y";
            OF="y";
            OF_ADDRESS="y";
            OF_EARLY_FLATTREE="y";
            OF_FLATTREE="y";
            OF_GPIO="y";
            OF_IRQ="y";
            OF_KOBJ="y";
            OF_MDIO="y";
            PCI="y";
            PCI_AR71XX="y";
            PCI_AR724X="y";
            PCI_DISABLE_COMMON_QUIRKS="y";
            PCI_DOMAINS="y";
            PCI_DRIVERS_LEGACY="y";
            PERF_USE_VMALLOC="y";
            PGTABLE_LEVELS="2";
            PHYLIB="y";
            PINCTRL="y";
            PTP_1588_CLOCK_OPTIONAL="y";
            RATIONAL="y";
            REGMAP="y";
            REGMAP_MMIO="y";
            REGULATOR="y";
            RESET_ATH79="y";
            RESET_CONTROLLER="y";
            SERIAL_8250="y";
            SERIAL_8250_CONSOLE="y";
            SERIAL_8250_NR_UARTS="1";
            SERIAL_8250_RUNTIME_UARTS="1";
            SERIAL_AR933X="y";
            SERIAL_AR933X_CONSOLE="y";
            SERIAL_AR933X_NR_UARTS="2";
            SERIAL_MCTRL_GPIO="y";
            SERIAL_OF_PLATFORM="y";
            SPI="y";
            SPI_AR934X="y";
            SPI_ATH79="y";
            SPI_BITBANG="y";
            SPI_GPIO="y";
            SPI_MASTER="y";
            SPI_MEM="y";
            SRCU="y";
            SWCONFIG="y";
            #SWCONFIG_LEDS="y";
            SWPHY="y";
            SYSCTL_EXCEPTION_TRACE="y";
            SYS_HAS_CPU_MIPS32_R2="y";
            SYS_HAS_EARLY_PRINTK="y";
            SYS_SUPPORTS_32BIT_KERNEL="y";
            SYS_SUPPORTS_ARBIT_HZ="y";
            SYS_SUPPORTS_BIG_ENDIAN="y";
            SYS_SUPPORTS_MIPS16="y";
            SYS_SUPPORTS_ZBOOT="y";
            SYS_SUPPORTS_ZBOOT_UART_PROM="y";
            TARGET_ISA_REV="2";
            TICK_CPU_ACCOUNTING="y";
            TINY_SRCU="y";
            USB_SUPPORT="y";
            USE_OF="y";
          };
          conditionalConfig = {
            WLAN = {
              #MT7915E = "m";
            };
          };
        };
        boot = {
          commandLine = [ "console=ttyS0,115200" ];
          tftp = {
            # Should be a segment of free RAM, where the tftp artifact
            # can be stored before unpacking it to the 'hardware.loadAddress'
            # The commands in 'printenv' for 'lu', 'lf' and 'lk'
            # seem to suggest files are trtp'ed to 0x80060000 before
            # copying them to the flash, so let's try that.
            loadAddress = lim.parseInt "0x80060000";
            appendDTB = true;
          };
        };
        filesystem =
        let inherit (pkgs.pseudofile) dir symlink;
             in
               dir {
                 lib = dir {
                   firmware = dir {
                     mediatek = symlink firmware;
                   };
                 };
               };

      hardware =
        let
          openwrt = pkgs.openwrt;
          mac80211 =  pkgs.kmodloader.override {
            inherit (config.system.outputs) kernel;
            targets = [ /*TODO "ath9k"*/ ];
          };
        in {
          # from openwrt bootlog
          # [    0.896994] 5 tp-link partitions found on MTD device spi0.0
          # [    0.902676] Creating 5 MTD partitions on "spi0.0":
          # [    0.907544] 0x000000000000-0x000000020000 : "u-boot"
          # [    0.913624] 0x000000020000-0x0000001a3cc8 : "kernel"
          # [    0.920249] 0x0000001a3cc8-0x0000007f0000 : "rootfs"
          # [    0.925932] mtd: device 2 (rootfs) set to be root filesystem
          # [    0.931748] 1 squashfs-split partitions found on MTD device rootfs
          # [    0.938019] 0x0000003b0000-0x0000007f0000 : "rootfs_data"
          # [    0.945224] 0x0000007f0000-0x000000800000 : "art"
          # [    0.951066] 0x000000020000-0x0000007f0000 : "firmware"
          flash = {
            # from the uboot bootlog 'Booting image at 9f020000'
            # (0x20000 from 0x9f000000)
            # also confirmed from default bootcmd in env: "bootm 0x9f020000"
            address = lim.parseInt "0x9f020000";
            # 0x000000020000-0x0000007f0000
            size = lim.parseInt "0x7d0000";
            # TODO: find in /proc/mtd on a running system
            eraseBlockSize = 65536;
          };

          # guessed - might also be mtdimage? or something else?
          defaultOutput = "uimage";
          # not found in openwrt sysupgrade image:
          # openwrt-23.05.2-ath79-generic-tplink_archer-c7-v1-squashfs-sysupgrade.bin: firmware 7500 v1 OpenWrt r23630-842932a63d, 8126464 bytes or less, at 0x200 2329811 bytes , at 0x238ed4 3676624 bytes \012- Squashfs filesystem, little endian, version 4.0, xz compressed, 3676624 bytes, 1352 inodes, blocksize: 262144 bytes, created: Tue Nov 14 13:38:11 2023
          loadAddress = lim.parseInt "0x80001000";
          entryPoint = lim.parseInt "0x80001000";
          # from openwrt bootlog:
          # [    0.925932] mtd: device 2 (rootfs) set to be root filesystem
          rootDevice = "/dev/mtdblock2";
          dts = {
            src = "${openwrt.src}/target/linux/ath79/dts/qca9558_tplink_archer-c7-v1.dts";
            includes =  [
              "${openwrt.src}/target/linux/ath79/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"; };

              wlan = link.build {
                ifname = "wlan0";
                dependencies = [ mac80211 ];
              };
              #wlan5 = link.build {
              #  ifname = "wlan1";
              #  dependencies = [ mac80211 ];
              #};
            };
        };
    };
    };
}