liminix/devices/gl-mt300n-v2/default.nix

# GL.INet GL-MT300N v2

{
  system = {
    crossSystem = {
      config = "mipsel-unknown-linux-musl";
      gcc = {
        abi = "32";
        arch = "mips32";          # maybe mips_24kc-
      };
    };
  };

  # We need to be able to import default.nix before we import nixpkgs
  # because it has the system config to tell nixpkgs what arch to build for.
  # But we also need some way to do things like fetchFromGitHub in the
  # per-device config and we can only do that once we have a reference to
  # pkgs

  overlay = final: prev:
    let
      openwrt = final.fetchFromGitHub {
        name = "openwrt-source";
        repo = "openwrt";
        owner = "openwrt";
        rev = "a5265497a4f6da158e95d6a450cb2cb6dc085cab";
        hash = "sha256-YYi4gkpLjbOK7bM2MGQjAyEBuXJ9JNXoz/JEmYf8xE8=";
      };
    in {
      kernel = prev.kernel.override {
        src = final.fetchurl {
          name = "linux.tar.gz";
          url = "https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.15.71.tar.gz";
          hash = "sha256-yhO2cXIeIgUxkSZf/4aAsF11uxyh+UUZu6D1h92vCD8=";
        };
        extraPatchPhase = ''
          cp -av ${openwrt}/target/linux/generic/files/* .
          chmod -R u+w .
          cp -av ${openwrt}/target/linux/ramips/files/* .
          chmod -R u+w .
          patches() {
            for i in $* ; do patch --batch --forward -p1 < $i ;done
          }
          patches ${openwrt}/target/linux/generic/backport-5.15/*.patch
          patches ${openwrt}/target/linux/generic/pending-5.15/*.patch
          patches ${openwrt}/target/linux/generic/hack-5.15/*.patch
          patches ${openwrt}/target/linux/ramips/patches-5.15/*.patch
        '';
      };
    };
  kernel = rec {
    dts = { openwrt,... } : "${openwrt}/target/linux/ramips/dts/mt7628an_glinet_gl-mt300n-v2.dts";
    config = {
      MIPS_ELF_APPENDED_DTB = "y";
      OF = "y";
      USE_OF = "y";

      RALINK = "y";
      SOC_MT7620 = "y";
      CPU_LITTLE_ENDIAN= "y";

      SERIAL_8250_CONSOLE = "y";
      SERIAL_8250 = "y";
      SERIAL_CORE_CONSOLE = "y";
      SERIAL_OF_PLATFORM = "y";

      CONSOLE_LOGLEVEL_DEFAULT = "8";
      CONSOLE_LOGLEVEL_QUIET = "4";

      # "empty" initramfs source should create an initial
      # filesystem that has a /dev/console node and not much
      # else.  Note that pid 1 is started *before* the root
      # filesystem is mounted and it expects /dev/console to
      # be present already
      BLK_DEV_INITRD = "n";

      MTD = "y";
      MTD_CMDLINE_PARTS = "y";
      MTD_BLOCK = "y";          # fix undefined ref to register_mtd_blktrans_dev

      REGULATOR = "y";
      REGULATOR_FIXED_VOLTAGE = "y";

      NET = "y";
      NETDEVICES = "y";
      ETHERNET = "y";

      PHYLIB = "y";
      AT803X_PHY="y";
      FIXED_PHY="y";
      GENERIC_PHY="y";
      NET_VENDOR_RALINK = "y";
      NET_RALINK_RT3050 = "y";
      NET_RALINK_SOC="y";

      SWCONFIG = "y";

      GPIOLIB="y";
      GPIO_MT7621 = "y";

      # this is all copied from nixwrt ath79 config. Clearly not all
      # of it is device config, some of it is wifi config or
      # installation method config or ...

      "CMDLINE_PARTITION" = "y";
      "EARLY_PRINTK" = "y";
      "FW_LOADER" = "y";
      # we don't have a user helper, so we get multiple 60s pauses
      # at boot time unless we disable trying to call it
      "FW_LOADER_USER_HELPER" = "n";

      "MODULE_SIG" = "y";

      "PARTITION_ADVANCED" = "y";
      "PRINTK_TIME" = "y";
      "SQUASHFS" = "y";
      "SQUASHFS_XZ" = "y";
    };
  };
  outputs.default = "directory";
  boot = {
    loadAddress = "0x80000000";
    entryPoint  = "0x80000000";
  };
}