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Update the files which contain no license information with the 'Apache-2.0' SPDX license identifier. Many source files in the tree are missing licensing information, which makes it harder for compliance tools to determine the correct license. By default all files without license information are under the default license of Zephyr, which is Apache version 2. Signed-off-by: Anas Nashif <anas.nashif@intel.com> |
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| .. | ||
| src | ||
| CMakeLists.txt | ||
| prj_single.conf | ||
| prj.conf | ||
| README.rst | ||
| sample.yaml | ||
.. _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.