What causes the "IU in error mode (tt =0x2b)" error and what does it mean?

Wed Jun 30 17:40:37 UTC 2010

I'm running an application on a LEON3 processor using the POSIX API with rtems 4.10.  The application is loaded and started using grmon.  After some time I see the following error:

IU in error mode (tt = 0x2b)
 40018688  820860ff   and  %g1, 0xff, %g1

Can someone explain what this error means, what causes the error, and what might be done to resolve it?

Michael T. Gardner

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