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  before OpenBSD can be successfully installed.  The SPARC Enterprise
  T5120/T5220 needs at least OBP 4.28.0.
  
+ On machines like the Oracle SPARC T4-2, older firmware versions from
+ around 2011 are known to cause kernel panics and crashes in
+ <a href="https://man.openbsd.org/sparc64/ldomd.8">ldomd</a>;  later
+ versions, at least SysFW 8.9.11 from 2018, are known to work.
+ 
  <h4>Supported devices</h4>
  
  <ul>