Filter
Top Products
Technical Reference 111
While in the recovery mode, there is no screen display on the monitor. The keyboard is disabled as
the system automatically recovers the BIOS. The following beep codes describe the recovery
status.
Table 68. Beep Codes
Beep Code Message
2 Successful completion, no errors.
4 The system could not boot from the diskette. The diskette may not be bootable.
Continuous series of
low beeps
The wrong BIOS recovery files are being used and/or the flash memory jumper is in
the wrong position.
9. Wait for POST to complete and for the message “Press F1 to resume, Press F2 to Setup” to be
displayed.
10. Turn off the system, and disconnect all AC power cords from the system.
11. Move the jumper from pins 6 and 7 back to pins 5 and 6.
12. If the baseboard is installed in a system, reinstall the access covers, connect the power cords,
and turn on the system for the change to take effect.
13. After running the special recovery mode, run the SSU to specify a new password. See
Chapter 3.
Interrupts
The table below recommends the logical interrupt mapping of interrupt sources; it reflects a typical
configuration, but a user can change these interrupts. Use the information to determine how to
program each interrupt. The actual interrupt map is defined using configuration registers in the
OSB4 I/O controller. I/O Redirection Registers in the I/O APIC are provided for each interrupt
signal; the signals define hardware interrupt signal characteristics for APIC messages sent to local
APIC(s).
✏
NOTE
To disable the IDE controller and reuse the interrupt: if you plan to
disable the IDE controller to reuse the interrupt for that controller, you must
physically unplug the IDE cable from the board connector (IDE0) if a cable
is present. Simply disabling the drive by configuring the SSU option does
not make the interrupt available.
Table 69. Interrupt Definitions
ISA Interrupt Description
INTR Processor interrupt
NMI NMI to processor
IRQ1 Keyboard interrupt
IRQ3 Serial port A or B interrupt from SIO device, user-configurable
IRQ4 Serial port A or B interrupt from SIO device, user-configurable
continued