Nick Guenther wrote:
quoted text
>> From what I have heard, OpenBSD does not contain non-free software
>> (though I am not sure whether it contains any non-free firmware
>> blobs).
> 
> Um, OpenBSD is the only common OS that is actively against blobs. See
> http://www.openbsd.org/lyrics.html#39
> We're on the same side here.

He's referring to firmware binaries, not software that runs on the host 
machine's processor.  Browse around under:
http://www.openbsd.org/cgi-bin/cvsweb/src/sys/dev/microcode/

For example, the Atmel radio firmware's license is compatible with the 
BSD license, but incompatible with the GPL because it can be 
redistributed as object code only.