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
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