> > This was also discussed internally and the only way to identify Thunderbolt 
> > devices is to check the device IDs.
> > As you said, this will require us to maintain and keep the list up-to-date 
> > as we deliver new devices.
> 
> I don't really see how this can work.  You're asking me to put changes
> based on a secret spec into generic code that is used on every machine
> with PCI.  I have no way to maintain something like that.

> 
> This seems like a major screw up in the design and documentation of 
> Thunderbolt.

See
https://developer.apple.com/library/mac/documentation/HardwareDrivers/Conceptual/ThunderboltDevGuide/ThunderboltDevGuide.pdf

page 10 for one of the brief public notes on the not relying on I/O space.

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