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Writing to INTC_INIT_REGISTER1 crashes

Other Parts Discussed in Thread: AM3517

In supervisor mode on an AM3517, writing 0x1 to INTC_INIT_REGISTER1 (0x480c7010) causes an exception.

The PC jumps to 0x14010.

SPRUG0B says this register must be set to a 1 during initialization.

Can someone please tell me why?