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When using MPU wrappers version 2 (configUSE_MPU_WRAPPERS_V1 == 0), portRAISE_PRIVILEGE() is a no-op because the portSVC_RAISE_PRIVILEGE handler is compiled only for MPU wrappers version 1. As a result, an unprivileged task that calls taskENTER_CRITICAL() does not actually raise its privilege, so the subsequent BASEPRI write is ignored by the hardware and the critical section silently fails to mask interrupts. This produces latent, hard-to-debug faults. configALLOW_UNPRIVILEGED_CRITICAL_SECTIONS is therefore not supported with MPU wrappers version 2. In the ARMv7-M MPU ports: - When the option is left undefined under v2, default it to 0 instead of 1 so the dangerous default configuration is safe. - When the option is explicitly set to 1 under v2, raise a compile-time #error so the unsupported configuration is rejected loudly rather than failing silently at run time. Behaviour for MPU wrappers version 1 is unchanged.
Each real time kernel port consists of three files that contain the core kernel components and are common to every port, and one or more files that are specific to a particular microcontroller and/or compiler. + The FreeRTOS/Source/Portable/MemMang directory contains the five sample memory allocators as described on the https://www.FreeRTOS.org WEB site. + The other directories each contain files specific to a particular microcontroller or compiler, where the directory name denotes the compiler specific files the directory contains. For example, if you are interested in the [compiler] port for the [architecture] microcontroller, then the port specific files are contained in FreeRTOS/Source/Portable/[compiler]/[architecture] directory. If this is the only port you are interested in then all the other directories can be ignored.