.. _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.
fe051a9055