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From: Nate Williams <nate@mt.sri.com>
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To: Warner Losh <imp@village.org>
Cc: Mike Smith <msmith@FreeBSD.ORG>, mobile@FreeBSD.ORG
Subject: Re: cvs commit: src/sys/pccard pccard.c src/sys/isa sio.c src/sys/dev/ed if_ed_pccard.c src/sys/dev/ep if_ep_pccard.c 
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> : This actually becomes much more complex when you bring CardBus into the 
> : picture, as I believe (correct me if I'm wrong, since you have the spec 
> : there) that it uses level-triggered interrupts.  In this case, the device 
> : interrupt handler can't return (well, it can, but it will be immediately 
> : re-entered).
> 
> Yes.  Both cardbus and pccard use level triggered interrupts (or can
> use level triggered interrupts).  But if the card goes away, the
> bridge, I believe, deasserts the interrupt for the card.

I don't believe this is the case, at least for PCMCIA (from experience).


Nate
> : Oh, and I forgot with the CardBus thing above; if the slot is sharing an 
> : interrupt with someone else, you're probably screwed as well. (Unless the 
> : bus lets you call back into it to disable a slot once you've detected 
> : that it's gone.)
> 
> I believe that it is common practice to share the cardbus card
> interrupt with the cardbus bridge, but I may be mistaken about that.

Does the bridge need an interrupt?


Nate


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