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SubjectRe: 2.6.8-rc4-mm1 doesn't boot
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I've never understood this floppy IRQ6 business.
Apparently it requests IRQ6, but doesn't show up in /proc/interrupts

In any case, dropping a PCI interrupt on IRQ6 would surely break it
b/c that would set that IRQ6 to level trigger.

Before this change, did LNKD get set to something other than IRQ6?

-Len

On Wed, 2004-08-11 at 16:33, Bjorn Helgaas wrote:
> On Tuesday 10 August 2004 5:56 pm, Adrian Bunk wrote:
> > On Tue, Aug 10, 2004 at 04:46:57PM -0600, Bjorn Helgaas wrote:
> > > On Tuesday 10 August 2004 11:32 am, Adrian Bunk wrote:
> > > > On Tue, Aug 10, 2004 at 09:59:18AM -0600, Bjorn Helgaas wrote:
> > > > > On Tuesday 10 August 2004 9:09 am, Adrian Bunk wrote:
> > > > > > 2.6.8-rc3-mm1 boots fine on my computer.
> > > > > > 2.6.8-rc4-mm1 doesn't boot.
> > > > > > 2.6.8-rc4-mm1 with pci=routeirq boots.
> > >
> > It happens before the
> > floppy0: no floppy controllers found
> > line.
> >
> > Could there be a problem because the floppy driver doesn't find
> > anything (there's currently no floppy drive in my computer)?
>
> Not only is your machine floppy drive-less, but the driver thinks you
> don't even have a floppy *controller*, which I assume is separate
> from the actual drive.
>
> What mainboard do you have? Does it boot without "pci=routeirq"
> if you turn CONFIG_BLK_DEV_FD off?
>
> The code in the floppy_init() -> user_reset_fdc() -> WAIT() ->
> wait_til_done() -> reset_fdc() path looks pretty scary if there
> really is no controller out there. I'd feel much better if
> we at least tried to use ACPI to figure out whether we have
> a controller before we try to talk to it.
>
> All that aside, I still don't see how the pci=routeirq change
> would affect the floppy driver. It does request_irq(6, ...),
> and it is interesting that you have this:
>
> ACPI: PCI Interrupt Link [LNKD] enabled at IRQ 6
> ACPI: PCI interrupt 0000:00:04.0[A] -> GSI 6 (level, low) -> IRQ 6
>
> which is for your NIC. But the floppy controller isn't a PCI
> device, so the LNKD enable shouldn't matter to it.
>
> Let's see... you're using the PIC model. Maybe the floppy driver
> depends on the ACPI_IRQ_MODEL_PIC stuff in acpi_register_gsi()?
> Can you post the contents of /proc/interrupts with the floppy
> driver and "pci=routeirq"? It seems weird to have the floppy
> and the NIC share an IRQ, but it looks like that's what should
> be happening.
>
> Bjorn
> -
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