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Interestingly, and where in documentation it is written, what with TRUE of parameter diag-switch? we can have the given problem.
The IEEE 1275 specification.
What it does is implementation dependant.
If USB is too slow when diag-switch? is true, then make sure it isn't. You must have set it to true yourself, in which case this is a problem you created yourself.
Simply do not play with flags you do not understand and then tell us you need to know why they cause crazy effects, because.. frankly, I think the documentation is out there already. We've had the documentation discussion before in-house and the end result is always that there are so few, minor differences from the IEEE 1275 standard (which is 13 years old..) that, we do not need to document it *again*.