Hi, I'm still having trouble getting the IRQs for my on board NICs working probably. I think I set everything right in get_bus_conf.c, mptables.c and irq_table.c but in my linux bootup I get this message: MP-BIOS bug: 8254 timer not connected to IO-APIC. I based my changes on the tyan s2891 that got a amd 8131 and a nvidia CK804 hanging on the same cpu but on different links. My board got a AMD 8132 and a MCP55 hanging on two different CPUs. Am I'm missing some setup for the IO-APIC? some kind of routing maybe?
Some hints or a complete solution ;) would be appreciated.
THX, Knut Kujat.
I think this message about the bug is related to wrong ACPI IRQ ovveride entries.
Usually there are two IRQ overrides. IRQ0 override means that IRQ0 is not connected to pin 0 on APIC but to another, most likely pin 2. Check the figure above why. Second IRQ override is for ACPI IRQ. This overrides the 'level' of the interrupt to 'active low'. The rest of the table is filled with NMI entries for the processor.
http://www.coreboot.org/File:ApicSystem.svg
Hope it helps,
Rudolf
Rudolf Marek escribió:
I think this message about the bug is related to wrong ACPI IRQ ovveride entries.
Usually there are two IRQ overrides. IRQ0 override means that IRQ0 is not connected to pin 0 on APIC but to another, most likely pin 2. Check the figure above why. Second IRQ override is for ACPI IRQ. This overrides the 'level' of the interrupt to 'active low'. The rest of the table is filled with NMI entries for the processor.
http://www.coreboot.org/File:ApicSystem.svg
Hope it helps,
Rudolf
Wow, thx for your fast reply! will check that out.
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Knut Kujat -
Rudolf Marek