Yes, it is true the PHY and SERDES enables in Global 2 should be
cleared before the interrupt handler is installed for device
interrupts.  That's what is done for the interrupts enables in
Global 1.  I'm not seeing that these enables are initialized.

Which switch?

6390X.

The device interrupts are not be cleared properly on that board.

I added in code to mask all interrupts. It did not help. I need to go
deeper and see if it is a PHY problem.

I suspect the same would happen if level interrupts were used.

I've not seen it loop. Which is why i want to understand it fully.

     Andrew