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

Hello !

Ok, I used the work around using

    PCIC_OPTS="irq_mode=0 pci_csc=0"

and the IDE (ide2) interface works, but when I try to remove the compact
flash, the system prints out (endless and with other interrupts locked):

ide2: unexpected interrupt, status=0xff, count=NNNNNN

(with increasing NNNN as loop counter).

I have to say, that I have not used the "cardctl eject" !!!
Is this really necessary, or is this a BUG ?

Again: linux-2.2.20, pcmcia-cs-3.1.33
Using CompactFlash (SAN DISK 32MB) und CF adapter

With friendly regards
Christoph Plattner



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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