Writing bit1 to this register disables (?) FIQ interrupts.
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This bit is set upon receipt of a FIQ interrupt and when [[SVC|svcUnbindInterrupt]] is called on the FIQ-abstraction [[ARM11_Interrupts#Private_Interrupts|software interrupt]] for the current core.
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It is cleared when binding that software interrupt to an event and after such an event is signaled.