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Seems that I need to install a PC104 interrupt watchdog module. There is some indication this has happened on the aircraft, also quite infrequently. A test is being setup out at RAF.
When the PC104 interrupts are being handled, the irqs listing looks like so, showing 275 interrupts/sec from the Emerald cards:
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root@low root# irqs
Counting interrupts over 5 seconds ...
IRQ Interrupt Type Total Int Int/sec
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3: ISA serial: 1376 275.2
24: GPIO-l eth0: 62 12.4
25: GPIO-l GPIO1-PC104: 1376 275.2
36: SC serial: 15 3
37: SC serial: 101 20.2
42: SC ost0: 509 101.8
114: GPIO isp116x-hcd:usb1: 90 18
115: GPIO serial: 228 45.6
116: GPIO serial: 102 20.4
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