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diff --git a/lib/systems/platforms.nix b/lib/systems/platforms.nix
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+# Note: lib/systems/default.nix takes care of producing valid,
+# fully-formed "platform" values (e.g. hostPlatform, buildPlatform,
+# targetPlatform, etc) containing at least the minimal set of attrs
+# required (see types.parsedPlatform in lib/systems/parse.nix).  This
+# file takes an already-valid platform and further elaborates it with
+# optional fields such as linux-kernel, gcc, etc.
+
+{ lib }:
+rec {
+  pc = {
+    linux-kernel = {
+      name = "pc";
+
+      baseConfig = "defconfig";
+      # Build whatever possible as a module, if not stated in the extra config.
+      autoModules = true;
+      target = "bzImage";
+    };
+  };
+
+  pc_simplekernel = lib.recursiveUpdate pc {
+    linux-kernel.autoModules = false;
+  };
+
+  powernv = {
+    linux-kernel = {
+      name = "PowerNV";
+
+      baseConfig = "powernv_defconfig";
+      target = "vmlinux";
+      autoModules = true;
+      # avoid driver/FS trouble arising from unusual page size
+      extraConfig = ''
+        PPC_64K_PAGES n
+        PPC_4K_PAGES y
+        IPV6 y
+
+        ATA_BMDMA y
+        ATA_SFF y
+        VIRTIO_MENU y
+      '';
+    };
+  };
+
+  ##
+  ## ARM
+  ##
+
+  pogoplug4 = {
+    linux-kernel = {
+      name = "pogoplug4";
+
+      baseConfig = "multi_v5_defconfig";
+      autoModules = false;
+      extraConfig = ''
+        # Ubi for the mtd
+        MTD_UBI y
+        UBIFS_FS y
+        UBIFS_FS_XATTR y
+        UBIFS_FS_ADVANCED_COMPR y
+        UBIFS_FS_LZO y
+        UBIFS_FS_ZLIB y
+        UBIFS_FS_DEBUG n
+      '';
+      makeFlags = [ "LOADADDR=0x8000" ];
+      target = "uImage";
+      # TODO reenable once manual-config's config actually builds a .dtb and this is checked to be working
+      #DTB = true;
+    };
+    gcc = {
+      arch = "armv5te";
+    };
+  };
+
+  sheevaplug = {
+    linux-kernel = {
+      name = "sheevaplug";
+
+      baseConfig = "multi_v5_defconfig";
+      autoModules = false;
+      extraConfig = ''
+        BLK_DEV_RAM y
+        BLK_DEV_INITRD y
+        BLK_DEV_CRYPTOLOOP m
+        BLK_DEV_DM m
+        DM_CRYPT m
+        MD y
+        REISERFS_FS m
+        BTRFS_FS m
+        XFS_FS m
+        JFS_FS m
+        EXT4_FS m
+        USB_STORAGE_CYPRESS_ATACB m
+
+        # mv cesa requires this sw fallback, for mv-sha1
+        CRYPTO_SHA1 y
+        # Fast crypto
+        CRYPTO_TWOFISH y
+        CRYPTO_TWOFISH_COMMON y
+        CRYPTO_BLOWFISH y
+        CRYPTO_BLOWFISH_COMMON y
+
+        IP_PNP y
+        IP_PNP_DHCP y
+        NFS_FS y
+        ROOT_NFS y
+        TUN m
+        NFS_V4 y
+        NFS_V4_1 y
+        NFS_FSCACHE y
+        NFSD m
+        NFSD_V2_ACL y
+        NFSD_V3 y
+        NFSD_V3_ACL y
+        NFSD_V4 y
+        NETFILTER y
+        IP_NF_IPTABLES y
+        IP_NF_FILTER y
+        IP_NF_MATCH_ADDRTYPE y
+        IP_NF_TARGET_LOG y
+        IP_NF_MANGLE y
+        IPV6 m
+        VLAN_8021Q m
+
+        CIFS y
+        CIFS_XATTR y
+        CIFS_POSIX y
+        CIFS_FSCACHE y
+        CIFS_ACL y
+
+        WATCHDOG y
+        WATCHDOG_CORE y
+        ORION_WATCHDOG m
+
+        ZRAM m
+        NETCONSOLE m
+
+        # Disable OABI to have seccomp_filter (required for systemd)
+        # https://github.com/raspberrypi/firmware/issues/651
+        OABI_COMPAT n
+
+        # Fail to build
+        DRM n
+        SCSI_ADVANSYS n
+        USB_ISP1362_HCD n
+        SND_SOC n
+        SND_ALI5451 n
+        FB_SAVAGE n
+        SCSI_NSP32 n
+        ATA_SFF n
+        SUNGEM n
+        IRDA n
+        ATM_HE n
+        SCSI_ACARD n
+        BLK_DEV_CMD640_ENHANCED n
+
+        FUSE_FS m
+
+        # systemd uses cgroups
+        CGROUPS y
+
+        # Latencytop
+        LATENCYTOP y
+
+        # Ubi for the mtd
+        MTD_UBI y
+        UBIFS_FS y
+        UBIFS_FS_XATTR y
+        UBIFS_FS_ADVANCED_COMPR y
+        UBIFS_FS_LZO y
+        UBIFS_FS_ZLIB y
+        UBIFS_FS_DEBUG n
+
+        # Kdb, for kernel troubles
+        KGDB y
+        KGDB_SERIAL_CONSOLE y
+        KGDB_KDB y
+      '';
+      makeFlags = [ "LOADADDR=0x0200000" ];
+      target = "uImage";
+      DTB = true; # Beyond 3.10
+    };
+    gcc = {
+      arch = "armv5te";
+    };
+  };
+
+  raspberrypi = {
+    linux-kernel = {
+      name = "raspberrypi";
+
+      baseConfig = "bcm2835_defconfig";
+      DTB = true;
+      autoModules = true;
+      preferBuiltin = true;
+      extraConfig = ''
+        # Disable OABI to have seccomp_filter (required for systemd)
+        # https://github.com/raspberrypi/firmware/issues/651
+        OABI_COMPAT n
+      '';
+      target = "zImage";
+    };
+    gcc = {
+      arch = "armv6";
+      fpu = "vfp";
+    };
+  };
+
+  # Legacy attribute, for compatibility with existing configs only.
+  raspberrypi2 = armv7l-hf-multiplatform;
+
+  zero-gravitas = {
+    linux-kernel = {
+      name = "zero-gravitas";
+
+      baseConfig = "zero-gravitas_defconfig";
+      # Target verified by checking /boot on reMarkable 1 device
+      target = "zImage";
+      autoModules = false;
+      DTB = true;
+    };
+    gcc = {
+      fpu = "neon";
+      cpu = "cortex-a9";
+    };
+  };
+
+  zero-sugar = {
+    linux-kernel = {
+      name = "zero-sugar";
+
+      baseConfig = "zero-sugar_defconfig";
+      DTB = true;
+      autoModules = false;
+      preferBuiltin = true;
+      target = "zImage";
+    };
+    gcc = {
+      cpu = "cortex-a7";
+      fpu = "neon-vfpv4";
+      float-abi = "hard";
+    };
+  };
+
+  scaleway-c1 = armv7l-hf-multiplatform // {
+    gcc = {
+      cpu = "cortex-a9";
+      fpu = "vfpv3";
+    };
+  };
+
+  utilite = {
+    linux-kernel = {
+      name = "utilite";
+      maseConfig = "multi_v7_defconfig";
+      autoModules = false;
+      extraConfig = ''
+        # Ubi for the mtd
+        MTD_UBI y
+        UBIFS_FS y
+        UBIFS_FS_XATTR y
+        UBIFS_FS_ADVANCED_COMPR y
+        UBIFS_FS_LZO y
+        UBIFS_FS_ZLIB y
+        UBIFS_FS_DEBUG n
+      '';
+      makeFlags = [ "LOADADDR=0x10800000" ];
+      target = "uImage";
+      DTB = true;
+    };
+    gcc = {
+      cpu = "cortex-a9";
+      fpu = "neon";
+    };
+  };
+
+  guruplug = lib.recursiveUpdate sheevaplug {
+    # Define `CONFIG_MACH_GURUPLUG' (see
+    # <http://kerneltrap.org/mailarchive/git-commits-head/2010/5/19/33618>)
+    # and other GuruPlug-specific things.  Requires the `guruplug-defconfig'
+    # patch.
+    linux-kernel.baseConfig = "guruplug_defconfig";
+  };
+
+  beaglebone = lib.recursiveUpdate armv7l-hf-multiplatform {
+    linux-kernel = {
+      name = "beaglebone";
+      baseConfig = "bb.org_defconfig";
+      autoModules = false;
+      extraConfig = ""; # TBD kernel config
+      target = "zImage";
+    };
+  };
+
+  # https://developer.android.com/ndk/guides/abis#v7a
+  armv7a-android = {
+    linux-kernel.name = "armeabi-v7a";
+    gcc = {
+      arch = "armv7-a";
+      float-abi = "softfp";
+      fpu = "vfpv3-d16";
+    };
+  };
+
+  armv7l-hf-multiplatform = {
+    linux-kernel = {
+      name = "armv7l-hf-multiplatform";
+      Major = "2.6"; # Using "2.6" enables 2.6 kernel syscalls in glibc.
+      baseConfig = "multi_v7_defconfig";
+      DTB = true;
+      autoModules = true;
+      preferBuiltin = true;
+      target = "zImage";
+      extraConfig = ''
+        # Serial port for Raspberry Pi 3. Wasn't included in ARMv7 defconfig
+        # until 4.17.
+        SERIAL_8250_BCM2835AUX y
+        SERIAL_8250_EXTENDED y
+        SERIAL_8250_SHARE_IRQ y
+
+        # Hangs ODROID-XU4
+        ARM_BIG_LITTLE_CPUIDLE n
+
+        # Disable OABI to have seccomp_filter (required for systemd)
+        # https://github.com/raspberrypi/firmware/issues/651
+        OABI_COMPAT n
+
+        # >=5.12 fails with:
+        # drivers/net/ethernet/micrel/ks8851_common.o: in function `ks8851_probe_common':
+        # ks8851_common.c:(.text+0x179c): undefined reference to `__this_module'
+        # See: https://lore.kernel.org/netdev/20210116164828.40545-1-marex@denx.de/T/
+        KS8851_MLL y
+      '';
+    };
+    gcc = {
+      # Some table about fpu flags:
+      # http://community.arm.com/servlet/JiveServlet/showImage/38-1981-3827/blogentry-103749-004812900+1365712953_thumb.png
+      # Cortex-A5: -mfpu=neon-fp16
+      # Cortex-A7 (rpi2): -mfpu=neon-vfpv4
+      # Cortex-A8 (beaglebone): -mfpu=neon
+      # Cortex-A9: -mfpu=neon-fp16
+      # Cortex-A15: -mfpu=neon-vfpv4
+
+      # More about FPU:
+      # https://wiki.debian.org/ArmHardFloatPort/VfpComparison
+
+      # vfpv3-d16 is what Debian uses and seems to be the best compromise: NEON is not supported in e.g. Scaleway or Tegra 2,
+      # and the above page suggests NEON is only an improvement with hand-written assembly.
+      arch = "armv7-a";
+      fpu = "vfpv3-d16";
+
+      # For Raspberry Pi the 2 the best would be:
+      #   cpu = "cortex-a7";
+      #   fpu = "neon-vfpv4";
+    };
+  };
+
+  aarch64-multiplatform = {
+    linux-kernel = {
+      name = "aarch64-multiplatform";
+      baseConfig = "defconfig";
+      DTB = true;
+      autoModules = true;
+      preferBuiltin = true;
+      extraConfig = ''
+        # Raspberry Pi 3 stuff. Not needed for   s >= 4.10.
+        ARCH_BCM2835 y
+        BCM2835_MBOX y
+        BCM2835_WDT y
+        RASPBERRYPI_FIRMWARE y
+        RASPBERRYPI_POWER y
+        SERIAL_8250_BCM2835AUX y
+        SERIAL_8250_EXTENDED y
+        SERIAL_8250_SHARE_IRQ y
+
+        # Cavium ThunderX stuff.
+        PCI_HOST_THUNDER_ECAM y
+
+        # Nvidia Tegra stuff.
+        PCI_TEGRA y
+
+        # The default (=y) forces us to have the XHCI firmware available in initrd,
+        # which our initrd builder can't currently do easily.
+        USB_XHCI_TEGRA m
+      '';
+      target = "Image";
+    };
+    gcc = {
+      arch = "armv8-a";
+    };
+  };
+
+  apple-m1 = {
+    gcc = {
+      arch = "armv8.3-a+crypto+sha2+aes+crc+fp16+lse+simd+ras+rdm+rcpc";
+      cpu = "apple-a13";
+    };
+  };
+
+  ##
+  ## MIPS
+  ##
+
+  ben_nanonote = {
+    linux-kernel = {
+      name = "ben_nanonote";
+    };
+    gcc = {
+      arch = "mips32";
+      float = "soft";
+    };
+  };
+
+  fuloong2f_n32 = {
+    linux-kernel = {
+      name = "fuloong2f_n32";
+      baseConfig = "lemote2f_defconfig";
+      autoModules = false;
+      extraConfig = ''
+        MIGRATION n
+        COMPACTION n
+
+        # nixos mounts some cgroup
+        CGROUPS y
+
+        BLK_DEV_RAM y
+        BLK_DEV_INITRD y
+        BLK_DEV_CRYPTOLOOP m
+        BLK_DEV_DM m
+        DM_CRYPT m
+        MD y
+        REISERFS_FS m
+        EXT4_FS m
+        USB_STORAGE_CYPRESS_ATACB m
+
+        IP_PNP y
+        IP_PNP_DHCP y
+        IP_PNP_BOOTP y
+        NFS_FS y
+        ROOT_NFS y
+        TUN m
+        NFS_V4 y
+        NFS_V4_1 y
+        NFS_FSCACHE y
+        NFSD m
+        NFSD_V2_ACL y
+        NFSD_V3 y
+        NFSD_V3_ACL y
+        NFSD_V4 y
+
+        # Fail to build
+        DRM n
+        SCSI_ADVANSYS n
+        USB_ISP1362_HCD n
+        SND_SOC n
+        SND_ALI5451 n
+        FB_SAVAGE n
+        SCSI_NSP32 n
+        ATA_SFF n
+        SUNGEM n
+        IRDA n
+        ATM_HE n
+        SCSI_ACARD n
+        BLK_DEV_CMD640_ENHANCED n
+
+        FUSE_FS m
+
+        # Needed for udev >= 150
+        SYSFS_DEPRECATED_V2 n
+
+        VGA_CONSOLE n
+        VT_HW_CONSOLE_BINDING y
+        SERIAL_8250_CONSOLE y
+        FRAMEBUFFER_CONSOLE y
+        EXT2_FS y
+        EXT3_FS y
+        REISERFS_FS y
+        MAGIC_SYSRQ y
+
+        # The kernel doesn't boot at all, with FTRACE
+        FTRACE n
+      '';
+      target = "vmlinux";
+    };
+    gcc = {
+      arch = "loongson2f";
+      float = "hard";
+      abi = "n32";
+    };
+  };
+
+  # can execute on 32bit chip
+  gcc_mips32r2_o32 = { gcc = { arch = "mips32r2"; abi = "o32"; }; };
+  gcc_mips32r6_o32 = { gcc = { arch = "mips32r6"; abi = "o32"; }; };
+  gcc_mips64r2_n32 = { gcc = { arch = "mips64r2"; abi = "n32"; }; };
+  gcc_mips64r6_n32 = { gcc = { arch = "mips64r6"; abi = "n32"; }; };
+  gcc_mips64r2_64  = { gcc = { arch = "mips64r2"; abi =  "64"; }; };
+  gcc_mips64r6_64  = { gcc = { arch = "mips64r6"; abi =  "64"; }; };
+
+  # based on:
+  #   https://www.mail-archive.com/qemu-discuss@nongnu.org/msg05179.html
+  #   https://gmplib.org/~tege/qemu.html#mips64-debian
+  mips64el-qemu-linux-gnuabi64 = (import ./examples).mips64el-linux-gnuabi64 // {
+    linux-kernel = {
+      name = "mips64el";
+      baseConfig = "64r2el_defconfig";
+      target = "vmlinuz";
+      autoModules = false;
+      DTB = true;
+      # for qemu 9p passthrough filesystem
+      extraConfig = ''
+        MIPS_MALTA y
+        PAGE_SIZE_4KB y
+        CPU_LITTLE_ENDIAN y
+        CPU_MIPS64_R2 y
+        64BIT y
+        CPU_MIPS64_R2 y
+
+        NET_9P y
+        NET_9P_VIRTIO y
+        9P_FS y
+        9P_FS_POSIX_ACL y
+        PCI y
+        VIRTIO_PCI y
+      '';
+    };
+  };
+
+  ##
+  ## Other
+  ##
+
+  riscv-multiplatform = {
+    linux-kernel = {
+      name = "riscv-multiplatform";
+      target = "Image";
+      autoModules = true;
+      baseConfig = "defconfig";
+      DTB = true;
+      extraConfig = ''
+        SERIAL_OF_PLATFORM y
+      '';
+    };
+  };
+
+  # This function takes a minimally-valid "platform" and returns an
+  # attrset containing zero or more additional attrs which should be
+  # included in the platform in order to further elaborate it.
+  select = platform:
+    # x86
+    /**/ if platform.isx86 then pc
+
+    # ARM
+    else if platform.isAarch32 then let
+      version = platform.parsed.cpu.version or null;
+      in     if version == null then pc
+        else if lib.versionOlder version "6" then sheevaplug
+        else if lib.versionOlder version "7" then raspberrypi
+        else armv7l-hf-multiplatform
+
+    else if platform.isAarch64 then
+      if platform.isDarwin then apple-m1
+      else aarch64-multiplatform
+
+    else if platform.isRiscV then riscv-multiplatform
+
+    else if platform.parsed.cpu == lib.systems.parse.cpuTypes.mipsel then fuloong2f_n32
+
+    else if platform.parsed.cpu == lib.systems.parse.cpuTypes.powerpc64le then powernv
+
+    else pc;
+}