[libreplanet-discuss] Equivalent of GPLv3 for hardware???

[Pen-Yuan Hsing]

Hello,

First of all, I acknowledge this list is mainly about free software, but 
I believe hardware is closely related so I am risking a question about 
it here. If there's a better place for this question, please accept my 
apologies and let me know where to go!

I really like the idea of copyleft and licenses such as the GPLv3. What 
is the closest equivalent of GPLv3 for hardware?

There's lots of talk about "open source hardware" but I haven't seen 
anything about free hardware (as in freedom, of course). I understand 
that software is more in the realm of copyright and hardware more about 
patents, but regardless of the RMS's or FSF's official stance on the 
issue, of all the existing "open" hardware licenses, is there one that 
most closely matches the GPLv3?

My follow up question is: Since software and hardware are often closely 
integrated, if I develop free (as in freedom) hardware, should I license 
the hardware under a free hardware license, while separately licensing 
the accompanying software under the GPLv3?

Thank you.