This paper describes a complete design flow for multiprocessor systems-on-chips (SoCs) covering the design phases from system-level modeling to FPGA prototyping. The design of complex heterogeneous systems is enabled by raising the abstraction level and providing several system-level design automation tools. The system is modeled in a UML design environment following a new UML profile that specifies the practices for orthogonal application and architecture modeling. The design flow tools are governed in a single framework that combines the subtools into a seamless flow and visualizes the design process. Novel features also include an automated architecture exploration based on the system models in UML, as well as the automatic back and forward annotation of information in the design flow. The architecture exploration is based on the global optimization of systems that are composed of subsystems, which are then locally optimized for their particular purposes. As a result, the design flow produces an optimized component allocation, task mapping, and scheduling for the described application. In addition, it implements the entire system for FPGA prototyping board. As a case study, the design flow is utilized in the integration of state-of-the-art technology approaches, including a wireless terminal architecture, a network-on-chip, and multiprocessing utilizing RTOS in a SoC. In this study, a central part of a WLAN terminal is modeled, verified, optimized, and prototyped with the presented framework.
Abstract. In today's business and software arena, more and more companies are adopting open source software. An example of this rising phenomenon is to base software products on highly reusable open source components. In this scenario, the evolution of the software product is coupled with the evolution of the open source component. A common assumption is that component updates are immediately and regularly propagated to the project. This paper investigates this assumption empirically by studying update propagation practices in two popular open source libraries, zlib and FFmpeg. For each library, we analyze various repository sources with information such as bug reports, revision history, and source code. The results of the case studies suggest that update propagation is subject to several technical and non-technical factors including the way the open source library is used, the extent to which updates are documented, and the degree of community involvement. Based on these findings, we propose a set of recommendations that would allow better follow-up of updates and smoother update propagation.
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