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I don't think this is hardware specific, but for what it is worth the hardware is a PowerPC embedded/headless server. Uboot programming, RS232 terminal access for maintenance/debugging. The software isn't much more than a linux kernel, busybox, the core scripts (rcS, inittab, etc), and a custom...

Background simplified, I need to generate a kernel signal when pin-X drops low. The CPU documentation identifies this as IRQ-1 (zero based), and searching the kernel code shows me that IPIC_EXT1 = 17... except that when I try to register my callback function I get an error that IRQ17 is already...