Well, there is not only the IDE driver; the USB driver does it as well:
In the 2.4.25, from the "drivers/usb/host/usb-ohci.c", in the 'ohci_pci_probe'
function:
And in the 2.6.7, from "drivers/usb/core/hcd-pci.c", in the 'usb_hcd_pci_probe'
function:
if (!dev->irq) {
err("found OHCI device with no IRQ assigned. check BIOS settings!");
pci_disable_device (dev);
return -ENODEV;
}
There are probably other drivers that have the wrong assumption that IRQ 0
is an unassigned IRQ.
Bertrand
-----Message d'origine-----
De?: David Woodhouse [mailto:dwmw2 at infradead.org]
Envoy??: vendredi 18 juin 2004 11:29
??: Bertrand Baudet
Cc?: linuxppc-embedded at lists.linuxppc.org; jgarzik at redhat.com;
B.Zolnierkiewicz at elka.pw.edu.pl
Objet?: Re: MPC5200Lite PCI & IRQ
On Fri, 2004-06-04 at 15:00 +0200, Bertrand Baudet wrote:
> Hi,
>
> I'm trying to plug a sata card in the PCI slot of the MPC5200Lite.
...
> By default the IRQ line of the sata card is 0,
...
> From the source code, it looks like a value 0 for the IRQ means the IRQ
> is disabled.
>
> From "drivers/ide/ide-probe.c", in the 'hwif_init' function:
> ...
> if (!hwif->irq) {
> if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
> {
> printk("%s: DISABLED, NO IRQ\n", hwif->name);
> return (hwif->present = 0);
> }
> }
> ...
>
> Commenting out the above code allow the PCI card to run properly.
This is a bug in the IDE driver. Zero is a perfectly valid IRQ number --
I have boxes where PCI slots get IRQ #0 too. Please fix the IDE driver
and send the patch to the IDE maintainer.
--
dwmw2
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
