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Subjectproblems with CONFIG_PCI_USE_VECTOR in 2.6.1
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When I tried a 2.6.1 kernel with CONFIG_PCI_USE_VECTOR, my onboard
Ethernet (sis900) produced nothing but watchdog timeouts. It worked
fine with the old IRQ routing.

When I looked in /var/log/syslog, I noticed that the Ethernet driver
was using a different IRQ, so I suspected the vector routing. I found
the following suspicious entries:

Jan 9 20:09:08 jaguar kernel: PCI: PCI BIOS revision 2.10 entry at 0xf11b0, last bus=1
Jan 9 20:09:08 jaguar kernel: PCI: Using configuration type 1
Jan 9 20:09:08 jaguar kernel: mtrr: v2.0 (20020519)
Jan 9 20:09:08 jaguar kernel: ACPI: Subsystem revision 20031002
Jan 9 20:09:08 jaguar kernel: IOAPIC[0]: Set PCI routing entry (2-20 -> 0xa9 -> IRQ 20 Mode:1 Active:1)
Jan 9 20:09:08 jaguar kernel: ACPI: SCI (IRQ20) allocation failed
Jan 9 20:09:08 jaguar kernel: ACPI-0133: *** Error: Unable to install System Control Interrupt Handler, AE_NOT_ACQUIRED
Jan 9 20:09:08 jaguar kernel: ACPI: Unable to start the ACPI Interpreter
Jan 9 20:09:08 jaguar kernel: Trying to free free IRQ20
Jan 9 20:09:08 jaguar kernel: ACPI: ACPI tables contain no PCI IRQ routing entries
Jan 9 20:09:08 jaguar kernel: PCI: Invalid ACPI-PCI IRQ routing table
Jan 9 20:09:08 jaguar kernel: PCI: Probing PCI hardware
Jan 9 20:09:08 jaguar kernel: PCI: Probing PCI hardware (bus 00)
Jan 9 20:09:08 jaguar kernel: Enabling SiS 96x SMBus.
Jan 9 20:09:08 jaguar kernel: PCI: Using IRQ router default [1039/0963] at 0000:00:02.0
Jan 9 20:09:08 jaguar kernel: PCI BIOS passed nonexistent PCI bus 0!
Jan 9 20:09:08 jaguar last message repeated 9 times
Jan 9 20:09:08 jaguar kernel: PCI BIOS passed nonexistent PCI bus 1!
Jan 9 20:09:08 jaguar kernel: PCI BIOS passed nonexistent PCI bus 0!


If anyone needs more information (kernel configs, syslog from the
non-USE_VECTOR kernel, etc) or if I can help in any way by trying
something out, please let me know.

--
Eric C. Cooper e c c @ c m u . e d u
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