[coreboot] IRQ 9 on s2895 and s2892

Myles Watson mylesgw at gmail.com
Tue Mar 10 21:32:41 CET 2009

I'm extracting this from a different thread hoping for more help :)
Thanks Rudolf for all the help so far.

This is the last "funny" snippet from a Linux boot log with ACPI enabled:

 irq 9: nobody cared (try booting with the "irqpoll" option)
 Pid: 0, comm: swapper Not tainted 2.6.27-11-generic #1

 Call Trace:
  <IRQ>  [<ffffffff8029e8ab>] __report_bad_irq+0x2b/0x90
  [<ffffffff8029ea47>] note_interrupt+0x137/0x170
  [<ffffffff8029f1dd>] handle_fasteoi_irq+0xed/0x110
  [<ffffffff80215b16>] do_IRQ+0x86/0x100
  [<ffffffff80212f0e>] ret_from_intr+0x0/0x29
  <EOI>  [<ffffffff8022d236>] ? native_safe_halt+0x6/0x10
  [<ffffffff805068ca>] ? atomic_notifier_call_chain+0x1a/0x20
  [<ffffffff8021ac35>] ? default_idle+0x55/0x60
  [<ffffffff80210e95>] ? cpu_idle+0x75/0x110
  [<ffffffff804fe845>] ? start_secondary+0x97/0xc2

 [<ffffffff803d2b90>] (acpi_irq+0x0/0x2b)
 Disabling IRQ #9
 Freeing initrd memory: 8460k freed
 audit: initializing netlink socket (disabled)

This IRQ is very active
>  9:          1        276         15      99709   IO-APIC-fasteoi   acpi
> Huh quite big number. Is it from coreboot or legacy BIOS?

It's from Coreboot.

Here's the same line from the factory BIOS:

   9:          0           0            0              0
IO-APIC-fasteoi   acpi

> Maybe some ACPI GP
> timer is generating the IRQ9?

How do you find an interrupt source that's going crazy like that?
When I boot with acpi=off I IRQ9 doesn't even get registered.


More information about the coreboot mailing list