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Troubleshooting 273
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.
PCI IRQ pool definition is the BIOS code assigned at run time.
IRQ Line Assignment IRQ Line Assignment
IRQ0 8254 timer IRQ8 Real-time clock
IRQ1 Keyboard controller IRQ9
PCI IRQ pool definition
IRQ2
Cascade for IRQ9
IRQ10 PCI IRQ pool definition
IRQ3
Serial port (COM2) or PCI
IRQ pool definition
IRQ11 PCI IRQ pool definition
IRQ4
Serial port (COM1) or PCI
IRQ pool definition
IRQ12 Mouse controller
IRQ5
PCI IRQ pool definition
IRQ13 Processor
IRQ6
PCI IRQ pool definition
IRQ14 Primary IDE controller
IRQ7
Reserve
IRQ15 Secondary IDE controller