Help: ICE_KEYS_JTAGPORT

JTAG cable debug port assignment on series 5+ cards

A runtime method for connecting the main board JTAG cable connector to one
of the I/O or Processor module sites.  This allows a developer to use
chipscope or other JTAG base debuggers on the module. Port numbers are:
  1 - I/O Module 1
  2 - I/O Module 2
  7 - Processor Module 1
  8 - Processor Module 2

The include file names are formed by prepending KEY_.