Most common cause of this is hanging the U3/U4. Do you have a hardware
debugger to see where this happens?

It's been my experience that RISCWatch isn't very helpful in these
situations (e.g. can't stop the processor). When the northbridge goes,
JTAG becomes unhappy.

Works fine for me, don't know what the difference is -- different
debugger?  The CPU JTAG chain is not connected to the U4 in any
way, fwiw.

What happens is, the API (EI, whatever -- the CPU bus) becomes
unusable after the bad I/O to U4; the CPU waits forever for the
bad load/store to finish.


Segher


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