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FCC Clarifies: It's Legal To Hack Your Router (betanews.com)
Mark Wilson writes with an update to an earlier report that the wording of new FCC regulations could mean that it would be illegal to modfiy the software running on wireless routers by installing alternative firmwares. Instead, The commission has now acknowledged that there was more than a little confusion from people who believed that manufacturers would be encouraged to prevent router modifications. The FCC wants to make it clear that most router hacking is fine and will remain fine. With a few exceptions, that is. In a blog post entitled Clearing the Air on Wi-Fi Software Updates, Julius Knapp from the FCC tries to clear up any misunderstandings that may exist.
There is no reason for an extra OS, because any additional microcontroller will only be managing the radio, and there is no reason to use an OS for that; you can just program the firmware to run directly.
All they really have to do though is compile the max gain into the existing firmware instead of letting the OS set it on boot. They have to cut/paste a couple lines from one .h file to another. Horrors. The rules on the max output wattage don't change very often; historically, I don't think it has ever been increased. The total net benefit of that being configurable has been zilch.
People handwaving about things getting "locked down" are a bit breathless. There is no reason companies are going to spend extra money on engineering hours to lock down stuff other than the radio gain and modulation settings.
The router stuff isn't being prevented or restricted in any way, those are simply the devices where some models were not following the rules. Basically, they moved too much of the radio init code into software out of laziness. The radio is a hardware radio, though, not software; so we're just talking about moving OS driver code into firmware, and all that gets moved is the init. There is no way they're going to save money by trying to "lock down" the OS, which is not really doable anyways.
Remember, software defined radio is more expensive than hardware radios, because of the processing requirements. So the radios were already all hardware. That is why the FCC engineers are a bit surprised and disappointed in the public and the doomsday speculation.