linux/Documentation/sparc/console.rst
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Prefs
   1Steps for sending 'break' on sunhv console
   2==========================================
   3
   4On Baremetal:
   5   1. press   Esc + 'B'
   6
   7On LDOM:
   8   1. press    Ctrl + ']'
   9   2. telnet> send  break
  10