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Why does my GICD_TYPER (ICDICTR) register indicate a higher number of CPU interfaces than cores, and could this create a problem for interrupts?

Question asked by Tyler Sheffield on Nov 22, 2013
Latest reply on Nov 24, 2013 by Anson Huang

I'm on a Solo, but bits [7:5] show 001 (two interfaces) instead of 000 (one interface).  What does that mean? i.e. what exactly is a 'CPU Interface'?  How does this register get set?