zephyr

History

Gerard Marull-Paretas abe3c1d3c5 samples: arch: mpu: mpu_test: use DEVICE_DT_GET Use DEVICE_DT_GET to obtain the flash device at compile time. Add readiness check at main. Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>		2022-03-31 13:55:10 +02:00
..
src	samples: arch: mpu: mpu_test: use DEVICE_DT_GET	2022-03-31 13:55:10 +02:00
CMakeLists.txt	cmake: increase minimal required version to 3.20.0	2021-08-20 09:47:34 +02:00
prj_single.conf
prj.conf
README.rst
sample.yaml	sample: mpu: skip the MPU test for Armv8-R AArch64	2021-04-13 07:47:44 -04:00

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:

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

  uart:~$ mpu read
  ***** BUS FAULT *****
    Precise data bus error
    BFAR Address: 0x24000000
  ***** Hardware exception *****
  Current thread ID = 0x20000400
  Faulting instruction address = 0x80004a8
  Fatal fault in thread 0x20000400! Aborting.