Some other relevant info:

http://www.opencollector.org/Whyfree/freedesign.html
It seems GPL is not well suited for hardware design.

Some attempts to create an alternative:
http://simplemachines.it/FHDL.html
http://www.simputer.org/simputer/license/ (deemed not free by FSF)
http://www.simputer.org/simputer/license/sgplvsgpl.php
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