zephyr

History

Sebastian Bøe 55ee53ce91 cmake: Prepend 'cmake_minimum_required()' into 'app' build scripts Prepend the text 'cmake_minimum_required(VERSION 3.8.2)' into the application and test build scripts. Modern versions of CMake will spam users with a deprecation warning when the toplevel CMakeLists.txt does not specify a CMake version. This is documented in bug #8355. To resolve this we include a cmake_minimum_required() line into the toplevel build scripts. Additionally, cmake_minimum_required is invoked from within boilerplate.cmake. The highest version will be enforced. This patch allows us to afterwards change CMake policy CMP000 from OLD to NEW which in turn finally rids us of the verbose warning. The extra boilerplate is considered more acceptable than the verbosity of the CMP0000 policy. Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>		2018-08-15 04:06:50 -07:00
..
src	…
CMakeLists.txt	…
README.rst	…
prj.conf	…
prj_single.conf	…
sample.yaml	…

README.rst

.. _mpu_test:

Memory Protection Unit (MPU) TEST
#################################

Overview
********
This test provides a set options to check the correct MPU configuration
against the following security issues:

* Read at an address that is reserved in the memory map.
* Write into the boot Flash/ROM.
* Run code located in SRAM.

If the MPU configuration is correct each option selected ends up in an MPU
fault.

Building and Running
********************

This project can be built and executed as follows:

.. zephyr-app-commands::
   :zephyr-app: samples/mpu/mpu_test
   :board: v2m_beetle
   :goals: build flash
   :compact:

Reset the board and you should be able to see on the corresponding
Serial Port the following message:

.. code-block:: console

   ***** BOOTING ZEPHYR OS v1.7.99 - BUILD: Mar  9 2017 13:01:59 *****
   *** MPU test options ***
   1 - Read a reserved address in the memory map
   2 - Write in to boot FLASH/ROM
   3 - Run code located in RAM
   Select an option:

To build the single thread version, use the supplied configuration file for
single thread: :file:`prj_single.conf`:

.. zephyr-app-commands::
   :zephyr-app: samples/mpu/mpu_test
   :board: v2m_beetle
   :conf: prj_single.conf
   :goals: run
   :compact:

To build a version that allows writes to the flash device, edit
``prj.conf``, and follow the directions in the comments to enable the
proper configs.

Sample Output
=============

.. code-block:: console

   ***** BOOTING ZEPHYR OS v1.7.99 - BUILD: May 12 2017 09:47:02 *****
   shell> select mpu_test
   mpu_test> read
   ***** BUS FAULT *****
     Executing thread ID (thread): 0x200003b8
     Faulting instruction address:  0x290
     Precise data bus error
     Address: 0x24000000
   Fatal fault in thread 0x200003b8! Aborting.