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HW-SW partitioning is a key problem in HW-SW code sign of embedded systems studied extensively in the past. All proposed approaches are top down flows, that start from a homogeneous formal specification of the system and determine an optimal partitioning. Thus, the proposed techniques do not exploit reuse nor reconsider the HWSW partitioning of an already designed platform. This paper proposes an extension of traditional flows that allows reuse and automatic generation of components and interfaces. The final flow has been applied to a complex industrial platform to prove the effectiveness and the advantages of the proposed approach.