On Saturday 30 May 2009, Øyvind Harboe wrote:
> > This would work well with a "disable_rtck" ... when
> > a board doesn't support it, it shouldn't be possible
> > to try using it even if the adapter does.
> 
> rtck is handled differently: if rtck is not supported, then
> setting rtck fails. The tcl code can catch this exception
> and deal with it.
> 
> look at the tcl definition of jtag_rtck...

Been there, done that.  Reread what I wrote:  the issue
is the *board* not wiring it.

The current code to check "is RTCK supported" only
addresses the JTAG adapter.  There's no way for it
to discern the case which I listed:  adapter supports
it, but board does not.

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