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+/*
+    ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+/**
+ * @defgroup HAL HAL Driver
+ * @brief   Hardware Abstraction Layer.
+ * @details The HAL (Hardware Abstraction Layer) driver performs the system
+ *          initialization and includes the platform support code shared by
+ *          the other drivers. This driver does contain any API function
+ *          except for a general initialization function @p halInit() that
+ *          must be invoked before any HAL service can be used, usually the
+ *          HAL initialization should be performed immediately before the
+ *          kernel initialization.<br>
+ *          Some HAL driver implementations also offer a custom early clock
+ *          setup function that can be invoked before the C runtime
+ *          initialization in order to accelerate the startup time.
+ *
+ * @ingroup HAL_NORMAL_DRIVERS
+ */