Troubleshooting
NANO-8045 User’s Manual
5-2
Loading the default optimal setting
When prompted with the main setup menu, please scroll down to “
Load Optimal
Defaults
”, press “Enter” and chose “OK” to load in default optimal BIOS setup. This
will force your BIOS setting back to the initial factory configuration. It is
recommended to do this so you can be sure the system is running with the BIOS
setting that Portwell has highly endorsed. As a matter of fact, users can load the
default BIOS setting any time when system appears to be unstable in boot up
sequence.
Improper disable operation
There are too many occasions where users disable a certain device/feature in one
application through BIOS setting. These variables may not be set back to the original
values when needed. These devices/features will certainly fail to be detected.
When the above conditions happen, it is strongly recommended to check the BIOS
settings. Make sure certain items are set as they should be. These include the COM1
port, USB ports, external cache, on-board VGA and Ethernet.
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
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
Sound, Network, USB 1.0/1.1 UHCI Controller
IRQ #6
Floppy Disk Controller
IRQ #7
Printer Port (Parallel Port)
IRQ #8
CMOS / Real Time Clock
IRQ #9
ACPI Controller
IRQ #10
SCSI adapter, Video card, USB controller
IRQ #11
Network Controller
IRQ #12
PS/2 Mouse Connector
IRQ #13
Math coprocessor
IRQ #14
Primary IDE Controller
IRQ #15
Secondary IDE Controller
