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diff --git a/os/hal/dox/hal.dox b/os/hal/dox/hal.dox
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+/*
+    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.
+
+    This file is part of ChibiOS/RT.
+
+    ChibiOS/RT is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    ChibiOS/RT is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * @defgroup HAL HAL Driver
+ * @brief Hardware Abstraction Layer.
+ * @details The HAL 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
+ * setum function that can be invoked before the C runtime initialization
+ * in order to accellerate the startup time.
+ *
+ * @ingroup IO
+ */