MPC860 BDM works with GDB

[Phil Torre]

If anyone else has trouble getting their BDM interface to an 860
target working, check your initialization of the SIUMCR register
and make sure you are clearing the FRC bit rather than setting it!
(If your BDM is using the FRZ signal, that is.  If you are using the
VFLS lines instead, it probably doesn't matter.)

Now that I understand the problem, I have no idea why it *ever* worked
this way, instead of only working sometimes.  Duh.

-Phil Torre (ptorre at zetron.com)