>Is the initialisation done in the kernel when isa_irq is not -1 somewhat
>specific to a given hardware (Netwinder ?) like setting up level/edge
>things ? Am I expected to initialize this beast from my bios ?
Not especially; the code in the kernel also works with CATS, and I gather with
some other boards too. ISA interrupts are almost always edge triggered. I'm
not aware of anything that your BIOS needs to set up.
The 8259 is a terrible chip. If you prod it in the wrong way it will either
go off sulking and refuse to generate any more interrupts, or start
interrupting permanently. But the existing ebsa-285 code should work I would
have thought.
p.
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