> > is adding jtag devices to the chain supported, or can I 
> enable / disable them?
> 
> Currently you can only set up the scan chain once. I find it 
> strange, but I'm willing to believe that TAP controllers 
> could come and go.
> 

a tap controller is added/removed in the str9xpec driver.
It is a bit of a hack, but it does work.

> enable/disable a jtag TAP controller is usually done via the 
> JTAG bypass functionality(standard), right?
> 

In the str9 case the arm is totally removed from the chain.
3 taps down to 2.

Cheers
Spen

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