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

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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