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Open Enterprise: Sun's open-source silicon blazes trails

18.09.2006
Traditional hardware design is a top-down process. If you need a CPU, you choose one from the various manufacturers' catalogs and then build your device around its specifications. If a given part doesn't suit your needs perfectly, you can sometimes work around its limitations in software, but otherwise you're stuck. Only the largest electronics vendors can afford to dabble with custom components.

But what if chip design could work more like open source software? What if even smaller customers could have input into the components that power their devices? If a whole community of engineers could work together to tweak and adjust a processor design, a single chip might grow into a family of parts that serves the needs of a variety of unique niches.

This is what Sun Microsystems hopes for its 64-bit, multicore, multithreaded UltraSparc T1 processor, (http://www.sun.com/processors/UltraSPARC-T1/) also known by the code name Niagara. In March, Sun released the full source code of the T1 under the Gnu GPL (General Public License) as part of the OpenSparc Project (http://opensparc.net/). As a result, independent developers can not only contribute suggestions and fixes to Sun's designs, but they can also create their own, entirely new versions of the T1, without paying Sun any license fees.

When I first heard about OpenSparc I thought it was a publicity stunt. So what if the design is open source? Compiling software on your Linux workstation is one thing, but how many basement tinkerers have the equipment to fabricate their own chips? And even if they could, who'd want to compete with Sun?

As it turns out, however, open source silicon isn't as crazy as it sounds. Remember, not even Sun has chip fabrication facilities of its own; it outsources Sparc to Fujitsu and others. And with the advent of service providers such as MOSIS (http://www.mosis.com/) (Metal Oxide Semiconductor Implementation Service), independent developers can produce short runs of custom chips very affordably. (MOSIS will even fabricate prototype chips for students free of charge, http://www.isi.edu/news/news.php?story=108.)

In the old days, Sun might have released the plans to the OpenSparc chip as a giant schematic diagram. You'd need a couple walls to view it all. Today, however, it can publish the design as code written in a special language called Verilog. Using simulation software, independent engineers can model the Verilog code to give them a higher-level view of the final design that they can work with and explore. They need fabricate nothing until they reach their final prototype design.