arm-trusted-firmware: add RK3399

pkgs/misc/arm-trusted-firmware/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, buildPackages }:
+{ stdenv, fetchFromGitHub, pkgsCross, buildPackages }:
 
 let
   buildArmTrustedFirmware = { filesToInstall
@@ -22,6 +22,9 @@ let
 
     depsBuildBuild = [ buildPackages.stdenv.cc ];
 
+    # For Cortex-M0 firmware in RK3399
+    nativeBuildInputs = [ pkgsCross.arm-embedded.stdenv.cc ];
+
     makeFlags = [
       "CROSS_COMPILE=${stdenv.cc.targetPrefix}"
       "PLAT=${platform}"
@@ -83,4 +86,11 @@ in rec {
     extraMeta.platforms = ["aarch64-linux"];
     filesToInstall = [ "build/${platform}/release/bl31/bl31.elf"];
   };
+
+  armTrustedFirmwareRK3399 = buildArmTrustedFirmware rec {
+    extraMakeFlags = [ "bl31" ];
+    platform = "rk3399";
+    extraMeta.platforms = ["aarch64-linux"];
+    filesToInstall = [ "build/${platform}/release/bl31/bl31.elf"];
+  };
 }