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Troubleshooting Your System 127
13
Replace processor 1 with processor 2. See "Installing a Processor" on
page 68.
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 143
.
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 VGA
IRQ3 Serial port IRQ11 USB controller
IRQ4 Serial port IRQ12 Mouse controller
IRQ5 Free IRQ13 Numeric data
Processor
IRQ6 Free IRQ14 Primary IDE
controller
IRQ7 Free IRQ15 Secondary IDE
controller
book.book Page 127 Thursday, March 4, 2010 4:38 PM