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Fast Interrupt Request (FIQ) support for the E3
Provide a FIQ handler for the E3.
This allows for fast handling of interrupts generated
by the clock line of the E3 mailboard (or a PS/2 keyboard)
connected to the GPIO based external keyboard port.
This allows for fast handling of interrupts generated
by the clock line of the E3 mailboard (or a PS/2 keyboard)
connected to the GPIO based external keyboard port.