Another possibility is to try and find the kernel source. If you look in Settings, system Information, Open Source Licenses, there is a site on Google Code that is supposed to contain the GPL'd components:
Going there doesn't show much except one user space component, and a link to a Sony mirror site:
I couldn't find anything useful on the Sony site, but maybe someone else will have better luck.
I'll also try plugging in a USB Serial adapter, but my expectations are pretty low that I'd be able to get a console from that. It's interesting that there are so many USB ports on the Google TV. I wonder what other USB peripherals might be supported? I can see the front port being used for a USB memory stick, and maybe one on the back for a camera, but that still leaves two unused ports. Any idea what Sony/Google might have intended them for?
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