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Troubleshooting Your System 123
13
Replace processor 1 with processor 2. See "Installing the Processor" on
page 66.
14
Repeat step 9 through step 11.
If you have tested both the processors and the problem persists, the system
board is faulty.
S
ee "Getting Help" on page 133
.
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 System timer IRQ8 Real-time clock
IRQ1 Keyboard controller IRQ9 ACPI functions
(used for power
management)
IRQ2 Interrupt controller
1 to enable IRQ8
through IRQ15
IRQ10 Available
IRQ3 Default for COM2 IRQ11 Available
IRQ4 Default for COM1 IRQ12 Available
IRQ5 Remote access
controller
IRQ13 Math coprocessor
IRQ6 Reserved IRQ14 IDE CD drive
controller
IRQ7 Reserved IRQ15 Available
book.book Page 123 Friday, November 8, 2013 11:29 AM