IBM 8651RM0 Hardware Maintenance Manual - Page 154

System-Board Configuration Jumpers Jumper Pins Description J6A1, BIOS Recovery 1-21 Sets BIOS boot block to normal startup mode. J6A1, BIOS Boot Block 2-3 1-21 Enables the BIOS flash memory recovery mode. Sets the BIOS boot block as write-protected. J6A2, Video Sleep 2-3 1-21 Sets the BIOS boot block as programmable. Sets address of Video Sleep Register to 03C3H. 2-3 Sets address of Video Sleep Register to 46E8H. J6A4, BIOS Write 1-2 2-31 Disables BIOS update of flash memory. Enables BIOS update of flash memory. Note: 1This is the factory default setting. 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: 1. The BIOS recovery jumper, J6A1, must be set to pins 2 and 3 to enable the BIOS flash memory recovery mode. 2. If 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. 3. Before you run the recovery procedure, verify that the BIOS write jumper, J6A4, is set to its default position at pins 2 and 3. To recover the BIOS:: 1. Power-off the server and peripheral devices and remove the top cover (see "Cover (Top)" on page 72). 2. Identify the BIOS recovery jumper, J6A1. 146 Netfinity Server HMM