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

Troubleshooting Your System 163

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Image 163
Dell C6145 manual IRQ Assignment Conflicts, Assignment Specific IRQ Requirements IRQ Line