Setting System-Board Configuration Jumpers

Table 15 (Page 2 of 2). Configuration Jumper Settings

Jumper

Pins

Description

 

 

 

J6A4, BIOS Write

1-2

Disables BIOS update of flash

 

 

memory.

 

2-31

Enables BIOS update of flash

 

 

memory.

Notes:

1.This is the factory default setting.

2.Do not change the settings for the other system-board jumpers. These jumper settings should remain as set at the factory, unless changed by an IBM service technician.

Enabling BIOS Recovery Mode (J6A1)

The flash memory contains a protected area that cannot be corrupted. The code in this area enables the server to start from a diskette when the BIOS becomes corrupted, for example, if a power failure occurs during a flash update. After starting, the Flash Memory Update Utility automatically recovers the system BIOS from the BIOS recovery files on the diskette.

Notes:

ŸThe BIOS recovery jumper, J6A1, must be set to pins 2 and 3 to enable the BIOS flash memory recovery mode.

ŸIf you have mapped the BIOS of an adapter 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 adapter from the system.

ŸBefore you run the recovery procedure, verify that the BIOS write jumper, J6A4, is set to its default position at pins 2 and 3.

Appendix A. Server Records 293

Page 311
Image 311
IBM 704 manual Enabling Bios Recovery Mode J6A1, 2 of 2. Configuration Jumper Settings