FreeRTOS Software Stack - 2021.2 English

Zynq UltraScale+ MPSoC Software Developer Guide

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2021.2 English

Xilinx provides a FreeRTOS board support package (BSP) as a part of the Vitis™ software platform. The FreeRTOS BSP provides you a simple, multi-threading environment with basic features such as, standard input/output and access to processor hardware features. The BSP and the included libraries are highly configurable to provide you the necessary functionality with the least overhead. The FreeRTOS software stack is similar to the bare metal software stack, except that it contains the FreeRTOS library. Xilinx device drivers included with the standalone libraries can typically be used within FreeRTOS provided that only a single thread requires access to the device. Xilinx bare metal drivers are not aware of Operating Systems. They do not provide any support for mutexes to protect critical sections, nor do they provide any mechanism for semaphores to be used for synchronization. While using the driver API with FreeRTOS kernel, you must take care of this aspect.

The following figure illustrates the FreeRTOS software stack for RPU.

Figure 1. FreeRTOS Software Stack
Note: The FreeRTOS software stack for APU is same as that for RPU except that the libraries support both 32-bit and 64-bit for APU.