Re: [coreboot] IOAPIC Initialisation - How much do you have to do ??

[Rudolf Marek]

Harrison, Jon (SELEX GALILEO, UK) napsal(a):
> Sooo. I've added MPtables and masked IRQ0 from boot but still get
>
> APIC error on CPU0:  40(40)

Hi, seems like I'm bit online ;)

Check if bit 7 on 48h

7 APIC FSB Fixed at Low DW

It changes how the APIC is delivered. Also if external bus is used, you will 
need to check the pin multiplexer/multifunction is setup correctly.
> Is there a kernel command line option that will turn on more verbose
> APIC output ?

Yes but not help apic=debug maybe

Rudolf

IOAPIC Initialisation - How much do you have to do ??

[Harrison, Jon (SELEX GALILEO, UK)]

Bit 7 of 48h is not set, to match Award, but I figured that this
wouldn't make much difference anyway as this board is not using the FSB
for interrupt delivery to the Local APIC.

No harm in flipping the bit to see what hapens though.

As far as I can tell the pin mux is all setup OK (58h[6] and also IOAPIC
Rx3)

As what are coming through are illegal vectors, I am thinking that
something is generating interrupts before a handler is in place or a
completely unhandled exception is being generated.

If I change IOAPIC IRQ initialisation to have a vector in a legal range
then the error changes

The one thing that I haven't managed to get done properly is disabling
the special cpu frequency change. While it's a long shot it may be that
this is causing something wierd to happen.

Think I'll have a closer read of the lapic spec too.

Jon
> -----Original Message-----
> From: Rudolf Marek [mailto:[e-mail]] 
> Sent: 24 July 2009 21:40
> To: Harrison, Jon (SELEX GALILEO, UK)
> Cc: [e-mail]
> Subject: Re: [coreboot] IOAPIC Initialisation - How much do 
> you have to do ??
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> Harrison, Jon (SELEX GALILEO, UK) napsal(a):
> > Sooo. I've added MPtables and masked IRQ0 from boot but still get
> >
> > APIC error on CPU0:  40(40)
>
> Hi, seems like I'm bit online ;)
>
> Check if bit 7 on 48h
>
> 7 APIC FSB Fixed at Low DW
>
> It changes how the APIC is delivered. Also if external bus is 
> used, you will 
> need to check the pin multiplexer/multifunction is setup correctly.
> > Is there a kernel command line option that will turn on more verbose
> > APIC output ?
>
> Yes but not help apic=debug maybe
>
> Rudolf

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