Re: Interrupts not being raised.

David Woodhouse (David.Woodhouse@mvhi.com)
Fri, 12 Feb 1999 14:16:25 +0000

mingo@chiara.csoma.elte.hu said:
> the question is, does after this 'first interrupt' your card work OK,
> (without using the asm)? If yes then somehow we managed to miss the
> first IRQ. If not then the card does not really produce interrupts.

No, it doesn't. The kernel still only reports two interrupts on that line,
because I've loaded the driver twice. The user-space programs which load the
firmware into the card are just sitting there doing nothing.

> the asm just simulates an interrupt received externally. (the
> simulation is not perfect but adequate for most purposes)

I've now read setup.S, and can see where the PICs are reprogrammed to map
IRQ0-15 onto int 0x20-0x2f. So how does the PIC generate the correct INT?
Surely the CPU doesn't have that many external pins?

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