c1a3208f83
The hardware reset state of the the MPU precludes any bus masters other then DMA access to memory. Unfortunately USB and SDHC have there own DMA and will not have access to memory in the default reset state. This change disabled the MPU if present on system startup.
91 lines
3.5 KiB
C
91 lines
3.5 KiB
C
/************************************************************************************
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* arch/arm/src/kinetis/kinetis_mpuinit.h
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*
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* Copyright (C) 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************************************/
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#ifndef __ARCH_ARM_SRC_KINETIS_KINETIS_MPUINIT_H
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#define __ARCH_ARM_SRC_KINETIS_KINETIS_MPUINIT_H
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/************************************************************************************
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* Included Files
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************************************************************************************/
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#include <nuttx/config.h>
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/************************************************************************************
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* Public Functions
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************************************************************************************/
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/****************************************************************************
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* Name: kinetis_mpuinitialize
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*
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* Description:
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* Configure the MPU to permit user-space access to only unrestricted MCU
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* resources.
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*
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****************************************************************************/
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#ifdef CONFIG_BUILD_PROTECTED
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void kinetis_mpuinitialize(void);
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#else
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# define kinetis_mpuinitialize()
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#endif
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/****************************************************************************
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* Name: kinetis_mpudisable
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*
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* Description:
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* Configure the MPU to permit All buss masters access to all resources.
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*
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****************************************************************************/
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#if !defined(CONFIG_BUILD_PROTECTED) && defined(KINETIS_MPU)
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void kinetis_mpudisable(void);
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#endif
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/****************************************************************************
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* Name: kinetis_mpu_uheap
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*
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* Description:
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* Map the user heap region.
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*
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****************************************************************************/
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#ifdef CONFIG_BUILD_PROTECTED
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void kinetis_mpu_uheap(uintptr_t start, size_t size);
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#else
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# define kinetis_mpu_uheap(start,size)
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#endif
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#endif /* __ARCH_ARM_SRC_KINETIS_KINETIS_MPUINIT_H */
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