RE : MPC5200Lite PCI & IRQ
flat view
From: Bertrand Baudet <hidden>
Date: 2004-06-18 10:06:20
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@infradead.org]
Envoyé : vendredi 18 juin 2004 11:29
À : Bertrand Baudet
Cc : linuxppc-embedded@lists.linuxppc.org; jgarzik@redhat.com; B.Zolnierkiewicz@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/