Re: 2.6.8-rc4-mm1 doesn't boot

Bjorn Helgaas
2004-08-11T20:36:49Z

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