WIP kernel config for belkin rt3200

devices/belkin-rt3200/default.nix

@@ -0,0 +1,117 @@
+{
+  description = ''
+    Belkin RT-3200 / Linksys E8450
+    ******************************
+
+    This device is based on a 64 bit Mediatek MT7622 ARM platform,
+    and is "work in progress" in Liminix.
+
+    The factory flash image contains ECC errors that make it incompatible
+    with Liminix: you need to use the `OpenWrt UBI Installer <https://github.com/dangowrt/owrt-ubi-installer>`_ to rewrite the partition layout before
+    you can flash Liminix onto it (or even use it with "tftpboot",
+    if you want the wireless to work).
+
+    - MediaTek MT7622BV (1350MHz)
+    - 128MB NAND flash
+    - 512MB	RAM
+    - b/g/n wireless using MediaTek MT7622BV (MT7615E driver)
+    - a/n/ac/ax wireless using  MediaTek MT7915E
+  '';
+
+  system = {
+    crossSystem = {
+      config = "aarch64-unknown-linux-musl";
+    };
+  };
+
+  module = {pkgs, config, ... }: {
+    imports = [ ../../modules/arch/aarch64.nix ];
+    kernel = {
+      src = pkgs.pkgsBuildBuild.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 = ''
+          ${pkgs.openwrt.applyPatches.mediatek}
+      '';
+      config = {
+        PCI = "y";
+        ARCH_MEDIATEK = "y";
+        # ARM_MEDIATEK_CPUFREQ = "y";
+        COMMON_CLK_MT7622 = "y";
+        COMMON_CLK_MT7622_ETHSYS = "y";
+        COMMON_CLK_MT7622_HIFSYS = "y";
+        COMMON_CLK_MT7622_AUDSYS = "y";
+
+        REGMAP_MMIO = "y";
+        CLKSRC_MMIO = "y";
+        REGMAP = "y";
+
+        MEDIATEK_GE_PHY = "y";
+        # MEDIATEK_MT6577_AUXADC = "y";
+        # MEDIATEK_WATCHDOG = "y";
+        # MTD_NAND_ECC_MEDIATEK = "y";
+        NET_MEDIATEK_SOC = "y";
+        NET_MEDIATEK_SOC_WED = "y";
+        NET_MEDIATEK_STAR_EMAC = "y"; # this enables REGMAP_MMIO
+        NET_VENDOR_MEDIATEK = "y";
+        PCIE_MEDIATEK = "y";
+        # PWM_MEDIATEK = "y"; # seems to be ramips?
+
+        BLOCK = "y"; # move this to base option
+        NETDEVICES = "y";  # and this probably also
+
+        MTD = "y";
+        MTD_BLOCK = "y";
+
+        MMC = "y";
+        MMC_BLOCK = "y";
+        MMC_CQHCI = "y";
+        MMC_MTK = "y";
+
+        PSTORE = "y";
+        PSTORE_RAM = "y";
+        PSTORE_CONSOLE = "y";
+        PSTORE_DEFLATE_COMPRESS = "n";
+
+        SERIAL_AMBA_PL011 = "y";
+        SERIAL_AMBA_PL011_CONSOLE = "y";
+      };
+    };
+    hardware =
+      let
+        openwrt = pkgs.openwrt;
+        mac80211 =  pkgs.mac80211.override {
+          drivers = ["mac80211_hwsim"];
+          klibBuild = config.system.outputs.kernel.modulesupport;
+        };
+      in {
+        defaultOutput = "flashimage";
+        loadAddress = "0x41080000";
+        entryPoint  = "0x41080000";
+        rootDevice = "/dev/mtdblock0";
+        dts = {
+          src = "${openwrt.src}/target/linux/mediatek/dts/mt7622-linksys-e8450.dts";
+          includes =  [
+            "${openwrt.src}/target/linux/mediatek/dts"
+            "${config.system.outputs.kernel.modulesupport}/arch/arm64/boot/dts/mediatek/"
+          ];
+        };
+
+        flash.eraseBlockSize = "65536"; # c.f. pkgs/mips-vm/mips-vm.sh
+        networkInterfaces =
+          let inherit (config.system.service.network) link;
+          in {
+            wan = link.build { ifname = "eth0"; };
+            lan = link.build { ifname = "eth1"; };
+
+            wlan_24 = link.build {
+              ifname = "wlan0";
+              dependencies = [ mac80211 ];
+            };
+          };
+      };
+
+  };
+}