diff --git a/tools/kconfig_new/confgen.py b/tools/kconfig_new/confgen.py
index 43e9b74a1..be9698234 100755
--- a/tools/kconfig_new/confgen.py
+++ b/tools/kconfig_new/confgen.py
@@ -310,14 +310,24 @@ def write_makefile(deprecated_options, config, filename):
 
         def get_makefile_config_string(name, value, orig_type):
             if orig_type in (kconfiglib.BOOL, kconfiglib.TRISTATE):
-                return "{}{}={}\n".format(config.config_prefix, name, '' if value == 'n' else value)
-            elif orig_type in (kconfiglib.INT, kconfiglib.HEX):
-                return "{}{}={}\n".format(config.config_prefix, name, value)
+                value = '' if value == 'n' else value
+            elif orig_type == kconfiglib.INT:
+                try:
+                    value = int(value)
+                except ValueError:
+                    value = ""
+            elif orig_type == kconfiglib.HEX:
+                try:
+                    value = hex(int(value, 16))  # ensure 0x prefix
+                except ValueError:
+                    value = ""
             elif orig_type == kconfiglib.STRING:
-                return '{}{}="{}"\n'.format(config.config_prefix, name, kconfiglib.escape(value))
+                value = '"{}"'.format(kconfiglib.escape(value))
             else:
                 raise RuntimeError('{}{}: unknown type {}'.format(config.config_prefix, name, orig_type))
 
+            return '{}{}={}\n'.format(config.config_prefix, name, value)
+
         def write_makefile_node(node):
             item = node.item
             if isinstance(item, kconfiglib.Symbol) and item.env_var is None:
@@ -373,13 +383,14 @@ def write_cmake(deprecated_options, config, filename):
                     val = ""  # write unset values as empty variables
                 elif sym.orig_type == kconfiglib.STRING:
                     val = kconfiglib.escape(val)
-                write("set({}{} \"{}\")\n".format(
-                    prefix, sym.name, val))
+                elif sym.orig_type == kconfiglib.HEX:
+                    val = hex(int(val, 16))  # ensure 0x prefix
+                write('set({}{} "{}")\n'.format(prefix, sym.name, val))
 
                 configs_list.append(prefix + sym.name)
                 dep_opt = deprecated_options.get_deprecated_option(sym.name)
                 if dep_opt:
-                    tmp_dep_list.append("set({}{} \"{}\")\n".format(prefix, dep_opt, val))
+                    tmp_dep_list.append('set({}{} "{}")\n'.format(prefix, dep_opt, val))
                     configs_list.append(prefix + dep_opt)
 
         config.walk_menu(write_node)
diff --git a/tools/kconfig_new/confserver.py b/tools/kconfig_new/confserver.py
index b02a2f1ce..57a948c75 100755
--- a/tools/kconfig_new/confserver.py
+++ b/tools/kconfig_new/confserver.py
@@ -224,6 +224,13 @@ def handle_set(config, error, to_set):
                     sym.set_value(0)
                 else:
                     error.append("Boolean symbol %s only accepts true/false values" % sym.name)
+            elif sym.type == kconfiglib.HEX:
+                try:
+                    if not isinstance(val, int):
+                        val = int(val, 16)  # input can be a decimal JSON value or a string of hex digits
+                    sym.set_value(hex(val))
+                except ValueError:
+                    error.append("Hex symbol %s can accept a decimal integer or a string of hex digits, only")
             else:
                 sym.set_value(str(val))
             print("Set %s" % sym.name)