Comment by tverbeure

While that's theoretically possible, it's even harder than trying to do it over, say, PCIe, because the latter at least still has a higher meaning to it while scan chain FFs are just grouped based on spatial proximity.

And of course that's assuming that a) the JTAG port is accessible on these boards and b) the raw scan chain access before scan chain compression hasn't been fused off or isn't locked behind some authentication protocol.

So, no. That didn't happen either. :-)