Multi-core architectures, thanks to their exceptional power efficiency and performance, are becoming widely used in embedded system products. This changing trend has pushed all developers to adapt their programs to take advantage of the new possibilities, coming from the use of multi-core devices. When this restructuring process is applied to Real Time Operating Systems, multiple and different approaches can be followed. This thesis aims, firstly, at analysing the main possible solutions for porting the single-core version of the RTOS u111, made by CSEM SA, to a multi-core SoC, based on a RISC-V 64-bits architecture. It then illustrates the whole process behind the final adaptation of the single-core version of the RTOS to a multi-kernel structure based on a shared memory configuration.