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

Jiri Gaisler jiri at gaisler.com
Wed Jun 30 18:01:58 UTC 2010

Trap 0x2b is write error. This is typically caused by writing to
a null pointer, since address 0 is in prom and write-protected
by default. The root problem is not the write error, but what
caused the null pointer ...


Gardner, Michael T wrote:
> 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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