There are many processor architectures that have different instruction memories 
for different functional units. 

SoCs often have multiple functional units on the same die. For radios that 
allows for a pipeline. You can limit what an EPROM will accept with a crypto 
signature.

This is common stuff.

-----Original Message-----
From: "David Lang" <[email protected]>
Sent: Mon, Mar 14, 2016 at 3:04 pm
To: [email protected]
Cc: "Wayne Workman" <[email protected]>, "bufferbloat-fcc-discuss" 
<[email protected]>, 
[email protected], [email protected]
Subject: Re: [Make-wifi-fast] [bufferbloat-fcc-discuss] 
[Cerowrt-devel]arstechnica confirmstp-link router lockdown

On Mon, 14 Mar 2016, [email protected] wrote:

> An external "limit-exceeding signal detector" could also be very inexpensive, 
> if it did not need to do ADC from the transmitted signal, but could get 
> access 
> to the digital samples and do a simple power measurement.

I agree with this, but have concerns about how you can lock down part of the 
firmware and not all of it.

You still have the problem of telling the chip/algorithm which set of rules to 
enforce, and updating it when the requirements change.

David Lang


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