The code looks like it should be doing a bit check, not logical.
2011-11-06 Mike Frysinger<vapier@gentoo.org>
PR sim/9302
* dv-mn103iop.c (write_dedicated_control_reg): Convert&& to&.
Indeed. I don't know this processor, and I couldn't easily find
an architecture manual for it. But the combination of the&& being
a nop, and the error message themselves, leads me to agree with you.
I would have asked someone familiar with the architecture, but this
file hasn't been touched since day 1 of the public CVS.