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