http://bugzilla.kernel.org/show_bug.cgi?id=8956





------- Comment #54 from [EMAIL PROTECTED]  2007-10-15 23:41 -------
Hi, Arjan
Thanks for your info.
Now there is another problem about your system. When booted with acpi=off, the
system reports that nobody cares IRQ 11. 
>From the comment of #50, #19 and #20, it is doubted that the problem is caused
by the BIOS bug( Ethernet PCI interrupt routing). 

1. When acpi is enabled, ethernet PCI interrupt is routed to Pin 23 of I/O APIC
through LINK device(LSA0) and IRQ number is 16. It seems that it can work well.
2. When booted with acpi=off noapic, ethernet PCI interrupt is routed to Pin 11
of I8259(defined directly by PCI device). It seems that eth0 can work well.
3. When booted with acpi=off, ethernet PCI interrupt is routed to Pin 15 of I/O
APIC accordint to the definition in MPS table(defined by BIOS) and IRQ 15 is
enabled. But the route is uncorrect and ethernet is still connected with Pin 11
of I/O APIC . After ethernet device is enabled, IRQ 15 can't receive the
interrupt and IRQ 11 can't process the interrupts triggered by ethernet device.
So the system will report that IRQ 11 is cared by nobody.
Based on the above analysis the problem is caused by the Bug of BIOS. So we
won't fix this problem. 
The patch about the timer override will be soon available.
Thanks.



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