Irq Assignment Conflicts - Dell PowerEdge C6145 Hardware Owner's Manual

12 Repeat step 9 and step 10.
If the problem persists, repeat step 11 and 12 with other removed
processors (if present) one by one.
13 If the problem stops by one of the tested processors, the processor(s)
tested before is (are) faulty. See "Getting Help" on page 179.
14 If you have tested all the processors and the problem persists, the
system board is faulty. See "Getting Help" on page 179.

IRQ Assignment Conflicts

Most PCI devices can share an IRQ with another device, but they cannot
use an IRQ simultaneously. To avoid this type of conflict, see the
documentation for each PCI device for specific IRQ requirements.
Table 4-1. Assignment Specific IRQ Requirements
IRQ Line Assignment
IRQ0 8254 timer
IRQ1 Keyboard controller
IRQ2 Cascade for IRQ9
IRQ3 Serial port
IRQ4 Serial port
IRQ5 Free
IRQ6 Free
IRQ7 USB controller
IRQ Line Assignment
IRQ8 RTC
IRQ9 SCI
IRQ10 USB controller, NIC
IRQ11 VGA, USB controller
IRQ12 Mouse controller
IRQ13 Processor
IRQ14 Primary IDE controller
IRQ15 Secondary IDE controller
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