[RTEMS Project] #3939: sparc64: _CPU_ISR_Disable seems broken

[RTEMS trac]

#3939: sparc64: _CPU_ISR_Disable seems broken
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  Reporter:  Gedare Bloom  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  normal        |  Milestone:  6.1
 Component:  admin         |    Version:  6
  Severity:  normal        |   Keywords:
Blocked By:                |   Blocking:
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 Both sparc64 BSPs (usiii, niagara) hang at the first call to
 `_CPU_ISR_Disable` in `boot_card` when run using qemu-system-sparc64.

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Ticket URL: <http://devel.rtems.org/ticket/3939>
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