configure arm linux toolchain

flake.nix

@@ -27,6 +27,19 @@
         ];
       };
 
+      crossSystem = {
+        system = "armv7l-linux";
+        linux-kernel = {
+          name = "zynq";
+          baseConfig = "multi_v7_defconfig";
+          target = "uImage";
+          installTarget = "uImage";
+          autoModules = false;
+          DTB = true;
+          makeFlags = [ "LOADADDR=0x8000" ];
+        };
+      };
+
       crosspkgs-overlay = (self: super: {
         pkgsCross = super.pkgsCross // {
           zynq-baremetal = import super.path {
@@ -38,6 +51,10 @@
               gcc.fpu = "vfpv3";
             };
           };
+          zynq-armv7l-linux = import super.path {
+            system = "x86_64-linux";
+            inherit crossSystem;
+          };
         };
       });
 
@@ -132,7 +149,7 @@
           "${patched-not-os}/zynq_image.nix"
         ];
         system = "x86_64-linux";
-        crossSystem.system = "armv7l-linux";
+        inherit crossSystem;
       });
 
       fast-servo-gateware = pkgs.stdenv.mkDerivation rec {
@@ -234,9 +251,7 @@
           dontFixup = true;
         };
 
-        u-boot = let
-          fast-servo-dts = fast-servo/fast-servo.dts;
-          in (pkgs.pkgsCross.armv7l-hf-multiplatform.buildUBoot {
+        u-boot = (pkgs.pkgsCross.zynq-armv7l-linux.buildUBoot {
             defconfig = "xilinx_zynq_virt_defconfig";
             patches = [] ++ pkgs.lib.optional (board == "fast-servo") ./fast-servo/u-boot.patch;
             preConfigure = ''
@@ -259,7 +274,7 @@
             filesToInstall = [ "u-boot.elf" ];
           }).overrideAttrs (oldAttrs: {
             postUnpack = ''
-              cp ${fast-servo-dts} $sourceRoot/arch/arm/dts/zynq-fast-servo.dts
+              cp ${fast-servo/fast-servo.dts} $sourceRoot/arch/arm/dts/zynq-fast-servo.dts
             '';
             postInstall = ''
               mkdir -p $out/dts