Dell PowerEdge R805 Hardware Owner's Manual (PDF) - Page 138

Checking the Equipment, Troubleshooting IRQ Assignment Conflicts

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Table 4-1. Start-Up Routine Indications (continued) Look/listen for: Action The USB CD drive activity indicator. See "Troubleshooting a USB Device" on page 143. The CD drive activity indicator. See "Troubleshooting an SD Card or Internal USB Key" on page 152. The hard-drive activity indicator. See "Troubleshooting a Hard Drive" on page 155. An unfamiliar constant scraping or grinding sound when you access a drive. See "Getting Help" on page 175. Checking the Equipment This section provides troubleshooting procedures for external devices attached to the system, such as the monitor, keyboard, or mouse. Before you perform any of the procedures, see "Troubleshooting External Connections" on page 139. Troubleshooting 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 4-2 lists the IRQ assignments. Table 4-2. IRQ Assignment Defaults IRQ Line IRQ0 IRQ1 IRQ2 IRQ3 IRQ4 IRQ5 IRQ6 Assignment System timer Keyboard controller Interrupt controller 1 to enable IRQ8 through IRQ15 Serial port 2 (COM2 and COM4) Serial port 1 (COM1 and COM3) Remote access controller Reserved 138 Troubleshooting Your System

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138
Troubleshooting Your System
Checking the Equipment
This section provides troubleshooting procedures for external devices
attached to the system, such as the monitor, keyboard, or mouse. Before you
perform any of the procedures, see "Troubleshooting External Connections"
on page 139.
Troubleshooting 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 4-2 lists the IRQ
assignments.
The USB CD drive activity indicator.
See "Troubleshooting a USB Device" on
page 143.
The CD drive activity indicator.
See "Troubleshooting an SD Card or Internal
USB Key" on page 152.
The hard-drive activity indicator.
See "Troubleshooting a Hard Drive" on
page 155.
An unfamiliar constant scraping or
grinding sound when you access a
drive.
See "Getting Help" on page 175.
Table 4-2.
IRQ Assignment Defaults
IRQ Line
Assignment
IRQ0
System timer
IRQ1
Keyboard controller
IRQ2
Interrupt controller 1 to enable IRQ8 through IRQ15
IRQ3
Serial port 2 (COM2 and COM4)
IRQ4
Serial port 1 (COM1 and COM3)
IRQ5
Remote access controller
IRQ6
Reserved
Table 4-1.
Start-Up Routine Indications
(continued)
Look/listen for:
Action