2017-03-09 19:12:48 +08:00
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.. _mpu_test:
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Memory Protection Unit (MPU) TEST
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#################################
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Overview
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********
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This test provides a set options to check the correct MPU configuration
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against the following security issues:
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* Read at an address that is reserved in the memory map.
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* Write into the boot Flash/ROM.
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* Run code located in SRAM.
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If the MPU configuration is correct each option selected ends up in an MPU
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fault.
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Building and Running
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********************
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This project can be built and executed as follows:
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2017-11-10 23:30:36 +08:00
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.. zephyr-app-commands::
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:zephyr-app: samples/mpu/mpu_test
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:board: v2m_beetle
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:goals: build flash
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:compact:
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2017-03-09 19:12:48 +08:00
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Reset the board and you should be able to see on the corresponding
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Serial Port the following message:
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.. code-block:: console
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***** BOOTING ZEPHYR OS v1.7.99 - BUILD: Mar 9 2017 13:01:59 *****
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*** MPU test options ***
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1 - Read a reserved address in the memory map
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2 - Write in to boot FLASH/ROM
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3 - Run code located in RAM
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Select an option:
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To build the single thread version, use the supplied configuration file for
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single thread: :file:`prj_single.conf`:
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2017-11-10 23:30:36 +08:00
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.. zephyr-app-commands::
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:zephyr-app: samples/mpu/mpu_test
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:board: v2m_beetle
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:conf: prj_single.conf
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:goals: run
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:compact:
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2017-03-09 19:12:48 +08:00
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2017-05-10 18:50:24 +08:00
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To build a version that allows writes to the flash device, edit
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``prj.conf``, and follow the directions in the comments to enable the
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proper configs.
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2017-03-09 19:12:48 +08:00
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Sample Output
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=============
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.. code-block:: console
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2017-05-10 18:50:24 +08:00
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***** BOOTING ZEPHYR OS v1.7.99 - BUILD: May 12 2017 09:47:02 *****
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shell> select mpu_test
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mpu_test> read
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***** BUS FAULT *****
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Executing thread ID (thread): 0x200003b8
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Faulting instruction address: 0x290
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Precise data bus error
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Address: 0x24000000
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Fatal fault in thread 0x200003b8! Aborting.
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