89 lines
2.6 KiB
ReStructuredText
89 lines
2.6 KiB
ReStructuredText
.. _mpu_test:
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Memory Protection Unit (MPU) Sample
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###################################
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Overview
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********
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This application 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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.. 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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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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.. 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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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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Sample Output
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=============
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.. code-block:: console
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uart:~$ mpu read
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<err> os: ***** BUS FAULT *****
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<err> os: Precise data bus error
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<err> os: BFAR Address: 0x24000000
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<err> os: r0/a1: 0x00009a5c r1/a2: 0x00000008 r2/a3: 0x20001aa8
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<err> os: r3/a4: 0x24000000 r12/ip: 0x00000000 r14/lr: 0x000029b7
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<err> os: xpsr: 0x21000000
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<err> os: Faulting instruction address (r15/pc): 0x000003c8
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<err> os: >>> ZEPHYR FATAL ERROR 0: CPU exception on CPU 0
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<err> os: Current thread: 0x20000708 (shell_uart)
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<err> os: Halting system
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.. code-block:: console
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uart:~$ mpu write
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write address: 0x4000
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<err> os: ***** MPU FAULT *****
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<err> os: Data Access Violation
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<err> os: MMFAR Address: 0x4000
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<err> os: r0/a1: 0x00000000 r1/a2: 0x0000000e r2/a3: 0x0badc0de
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<err> os: r3/a4: 0x00004000 r12/ip: 0x00000004 r14/lr: 0x000003ab
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<err> os: xpsr: 0x61000000
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<err> os: Faulting instruction address (r15/pc): 0x000003b2
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<err> os: >>> ZEPHYR FATAL ERROR 0: CPU exception on CPU 0
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<err> os: Current thread: 0x20000708 (shell_uart)
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<err> os: Halting system
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.. code-block:: console
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uart:~$ mpu run
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<err> os: ***** MPU FAULT *****
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<err> os: Instruction Access Violation
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<err> os: r0/a1: 0x00009a5c r1/a2: 0x00000001 r2/a3: 0x20001aa8
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<err> os: r3/a4: 0x20000000 r12/ip: 0x00000000 r14/lr: 0x00006673
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<err> os: xpsr: 0x60000000
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<err> os: Faulting instruction address (r15/pc): 0x20000000
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<err> os: >>> ZEPHYR FATAL ERROR 0: CPU exception on CPU 0
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<err> os: Current thread: 0x20000708 (shell_uart)
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<err> os: Halting system
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