Pretty certain you're not - search the archive for Krystian Lewandowski. He worked on GPIO code on the RaspberryPi port of Plan 9.

On Fri, Apr 11, 2014 at 9:28 PM, Szymon Olewniczak <szymon.olewniczak@rid.pl> wrote:

I'm very curious about that so I would like to ask if there are any Plan
9 users in Poland or am I the only one in my entire country?

BR,
Szymon