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Troubleshooting Your System | 163
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 IRQ Line Assignment
IRQ0 8254 timer IRQ8 RTC
IRQ1 Keyboard controller IRQ9 SCI
IRQ2 Cascade for IRQ9 IRQ10 USB controller, NIC
IRQ3 Serial port IRQ11 VGA, USB controller
IRQ4 Serial port IRQ12 Mouse controller
IRQ5 Free IRQ13 Processor
IRQ6
Free
IRQ14
Primary IDE controller
IRQ7 USB controller IRQ15 Secondary IDE controller