Re: ISA IRQ mapping and problem on PCI-PCMCIA Bridge

Thanks a lot !

Now I am happy not to be confused, because I could not understand
how the PCI IRQs are connected to the ISA ones. Now I know, that this
is NOT the fact, and the world is more clear to me !!

Bye
Christoph Plattner

PS: I will check out tomorrow, if the work around is usable for me and
works.



dhinds wrote:
> 
> On Wed, Mar 13, 2002 at 04:21:22PM +0100, Christoph Plattner wrote:
> >
> > First problem: The driver seems not to find any ISA IRQs.
> > Why ?  (In this setup I have "reserved" IRQ5 for ISA and
> > kept IRQ 9 free for PCI ("available")).
> 
> The driver finds no ISA interrupts because this is a PCI adapter card:
> it has no connection to the ISA bus so it can only use PCI interrupts.
> This is as it should be; the adapter should use its PCI interrupt for
> everything.
> 
> > In general: How should the ISA IRQ mapping work ?
> 
> ISA interrupt delivery only works on laptops, where the PCMCIA bridge
> chip is on the system board, and is hooked up both to the PCI bus and
> to the ISA interrupt controller.
> 
> > Does a PCI PCMCIA-Controller access 3 of them, one for the
> > controller itself, the other for the inserted devices (one
> > or two) ?
> 
> In your case, INTA is used by the bridge itself, and is also used for
> the PCMCIA card.
> 
> > When I insert the CF-Adapter, I see following log output (dmesg):
> >
> > hde: SanDisk SDCFB-32, ATA DISK drive
> > ide2: Disabled unable to get IRQ 9.
> 
> This is an age-old bug in the IDE driver that I've been griping about
> to the IDE maintainer for YEARS.  The driver does not understand that
> it needs to share its interrupt in this configuration.  The problem is
> documented in the BUGS file for the pcmcia-cs package, along with a
> workaround.
> 
> -- Dave

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