Troubleshooting
96M4311o User’s Manual 5-9
It is also very common that users would like to disable a certain device/port to
release IRQ resource. A few good examples are
disable COM1 serial port to release IRQ #4
disable COM2 serial port to release IRQ #3
disable parallel port to release IRQ #7
disable PS/2 mouse to release IRQ #12,
…, etc.
A quick review of the basic IRQ mapping is given below for your reference.
IRQ#
Description
IRQ #0
System Counter
IRQ #1
Keyboard
IRQ #2
Programmed Controller
IRQ #3
COM2
IRQ #4
COM1
IRQ #5
Display, Network , USB 1.0/1.1 UHCI Controller
IRQ #6
Floppy Disk Controller
IRQ #7
Printer Port (Parallel Port)
IRQ #8
CMOS Clock
IRQ #9
ACPI Controller
IRQ #10 USB 1.0/1.1 UHCI Controller , Multimedia Device ,
Network Controller
IRQ #11
SMBus , USB 1.0/1.1 UHCI, USB 2.0 EHCI Controller
IRQ #12
PS/2 mouse
IRQ #13
Data Processor
IRQ #14
Primary IDE Controller
IRQ #15
Secondary IDE Controller
It is then very easy to find out which IRQ resource is ready for additional peripherals.
If IRQ resource is not enough, please disable some devices listed above to release
further IRQ numbers.
