Memory Protection Unit (MPU) TEST¶
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:
# On Linux/macOS cd $ZEPHYR_BASE/samples/mpu/mpu_test mkdir build && cd build # On Windows cd %ZEPHYR_BASE%\samples\mpu\mpu_test mkdir build & cd build cmake -GNinja -DBOARD=v2m_beetle .. ninja ninja flash
To build the single thread version, use the supplied configuration file for
# On Linux/macOS cd $ZEPHYR_BASE/samples/mpu/mpu_test mkdir build && cd build # On Windows cd %ZEPHYR_BASE%\samples\mpu\mpu_test mkdir build & cd build cmake -GNinja -DBOARD=v2m_beetle -DCONF_FILE=prj_single.conf .. ninja run
To build a version that allows writes to the flash device, edit
prj.conf, and follow the directions in the comments to enable the
uart:~$ 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.