Hello,

I have an interrupt conflict between a two port pci-e serial card and the onboard ethernet controllers in a PowerEdge 850.

I'm running kernel 2.6.18-194.26.1.el5PAE with bios revision A04.

In every instance, the two serial ports have been allocated the same interrupts as the two ethernet controllers.

I have tried many kernel boot options, including acpi=off, pci=noirq, acpi=noirq.

When I enter the bios, I can see the same interrupts allocated to the serial ports and ethernet controllers. Attempting to change the interrupts manual causes both a nic and a serial port to both change, both to the same interrupt.

I have even tried disabling onboard usb and serial with no change.

I'm beginning to think the pci-e serial card is broken under linux. I have a similar card running on a PE850 under Windows Server 2003 and there are no such conflicts.

Here is some output from lspci -v :

02:00.0 Serial controller: Oxford Semiconductor Ltd OX16PCI954 (Quad 16950 UART) function 0 (Uart) (prog-if 06 [16950]) Subsystem: Oxford Semiconductor Ltd Unknown device 0001 Flags: medium devsel, IRQ 137 I/O ports at ecf8 [size=8] Memory at feaff000 (32-bit, non-prefetchable) [size=4K] I/O ports at ece0 [size=16] Memory at feafe000 (32-bit, non-prefetchable) [size=4K] Memory at feafd000 (32-bit, non-prefetchable) [size=4K] Capabilities: [40] Power Management version 1

02:01.0 Serial controller: Oxford Semiconductor Ltd OXCB950 Cardbus 16950 UART (prog-if 06 [16950]) Subsystem: Oxford Semiconductor Ltd Unknown device 0001 Flags: medium devsel, IRQ 145 I/O ports at ecf0 [disabled] [size=8] Memory at feafc000 (32-bit, non-prefetchable) [disabled] [size=4K] I/O ports at ecd0 [disabled] [size=16] Memory at feafb000 (32-bit, non-prefetchable) [disabled] [size=4K] Memory at feafa000 (32-bit, non-prefetchable) [disabled] [size=4K] Capabilities: [40] Power Management version 1

05:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5721 Gigabit Ethe rnet PCI Express (rev 11) Subsystem: Dell Unknown device 01b6 Flags: bus master, fast devsel, latency 0, IRQ 137 Memory at fe5f0000 (64-bit, non-prefetchable) [size=64K] Expansion ROM at <ignored> [disabled] Capabilities: [48] Power Management version 2 Capabilities: [50] Vital Product Data Capabilities: [58] Message Signalled Interrupts: 64bit+ Queue=0/3 Enable - Capabilities: [d0] Express Endpoint IRQ 0 Capabilities: [100] Advanced Error Reporting Capabilities: [13c] Virtual Channel

06:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5721 Gigabit Ethe rnet PCI Express (rev 11) Subsystem: Dell Unknown device 01b6 Flags: bus master, fast devsel, latency 0, IRQ 145 Memory at fe3f0000 (64-bit, non-prefetchable) [size=64K] Expansion ROM at <ignored> [disabled] Capabilities: [48] Power Management version 2 Capabilities: [50] Vital Product Data Capabilities: [58] Message Signalled Interrupts: 64bit+ Queue=0/3 Enable - Capabilities: [d0] Express Endpoint IRQ 0 Capabilities: [100] Advanced Error Reporting Capabilities: [13c] Virtual Channel

I'm fairly stumped, and I'm about ready to try different serial hardware.

Any clues from the experts on this list?

Regards,

Dan

------

dan irwin

it manager

jackie's wholesale nurseries p/l t/a

zoomgarden

56 coutts drive burpengary qld 4505

email dan@jackies.com.au

tel 07 3888 2481

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