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Chapter 8 System Board Jumpers
Boot Option
Moving the boot option jumper on the J2J1, Boot Opt NOR pins to the
REC pins enables the BIOS flash memory special recovery mode. The
system BIOS can be corrupted, for example, when the update procedure is
aborted due to a power outage. However, flash memory contains a
protected area that cannot be corrupted. Code in this area is used to boot
the computer from drive A when the BIOS has been corrupted. After
booting, the Flash Memory Update Utility is used to automatically recover
the system BIOS from the BIOS recovery files on the diskette.
✏
Note
If you have mapped the BIOS of an add-in board to any part
of the E0000H address range, you must either map it to
another area before completing a recovery procedure or
physically remove the board from the system. You do not
have to remove add-in boards for normal BIOS updates.
Recovering the BIOS
To recover the BIOS, do this:
1. Observe the precautions on page 3, “Safety Guidelines.”
2. Remove the left side cover as described in Chapter 4, “Working Inside
Your System.”
3. Move the jumper from the J2J1, Boot Opt NOR pins to the REC pins to
allow the system to boot from the recovery BIOS.
4. Replace the left side cover, and insert the Flash Memory Update Utility
diskette in drive A.
5. Connect the power cord(s) to the system, and turn it on. After the
system boots, the speaker emits a single beep and the recovery process
starts—it takes about three minutes. When the recovery process
completes, the speaker emits two beeps.
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.