Use custom u-boot build

flake.nix

@@ -54,7 +54,8 @@
       buildInputs = with pkgs; [ qemu ];
       # Here we tell the run script where to find the system
       NIXOS_SYSTEM_TOPLEVEL = toplevel;
-      OPENSBI = syspkgs.opensbi;
+      OPENSBI = syspkgs.opensbi-uboot;
+      #OPENSBI = syspkgs.opensbi;
     };
   };
 }

overlay.nix

@@ -20,4 +20,19 @@ final: prev:
   });
 
   qemu = prev.qemu.override { rutabagaSupport = false; };
+
+  uboot-custom = prev.ubootQemuRiscv64Smode.override {
+    extraConfig = ''
+      CONFIG_CMD_QFW=y
+    '';
+  };
+
+  opensbi-uboot = prev.opensbi.overrideAttrs (old: {
+    makeFlags = old.makeFlags ++ [
+        # Build OpenSBI without compressed instructions
+        "PLATFORM_RISCV_ISA=rv64gv"
+        # Check with: riscv64-unknown-elf-objdump -d -M no-aliases rotate
+        "FW_PAYLOAD_PATH=${final.uboot-custom}/u-boot.bin"
+    ];
+  });
 }