Re: pnp code and irq 2 broken

From: Doug Rabson (dfr_at_nlsystems.com)
Date: 08/28/03

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    To: John Hay <jhay@icomtek.csir.co.za>
Date: 28 Aug 2003 13:26:51 +0100

    On Wed, 2003-08-27 at 06:45, John Hay wrote:
    > Hi,
    >
    > Somewhere along the line the code in FreeBSD that maps irq 2 to irq 9 has
    > gone away and a panic was added if one tries to use irq 2. This is all
    > well and fine, except that the pnp code was not notified of this. :-) So
    > if you have a pnp device that have irq 2 in its mask and FreeBSD then
    > decides that irq 2 is a good irq to use for this device, you have an
    > instant panic.
    >
    > I have worked around it with this crude patch below. Crude because:
    > 1) I don't know if it should be an i386 only fix, and
    > 2) I used 0x04 directly, maybe IRQ_SLAVE from i386/isa/icu.h or
    > some other define should be used?
    >
    > Any comments from anyone?

    I think that the way this used to work was that irq 2 was never included
    in the irq resource map. The allocation code would never choose a
    configuration which used irq 2 because it should never be possible to
    allocate that resource.

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