IBM 8646 Hardware Maintenance Manual - Page 24

IBM Server Support, and the system will boot from the backup BIOS

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updates the primary BIOS. The backup BIOS can be updated by moving the primary BIOS to the backup BIOS page during the diskette flash update process. The ABR feature can be disabled with the jumper J20; this action is not normally required. Note: You can obtain a BIOS flash diskette from one of the following sources: v Use the ServerGuide program to make a BIOS flash diskette. v Download a BIOS flash diskette from the World Wide Web. Go to http://www.ibm.com/pc/support/, select IBM Server Support, and make the selections for your server. To recover the BIOS, do the following: 1. Shutdown the server 2. Insert the BIOS flash diskette into the diskette drive. 3. Restart the server. The system begins the power-on self-test (POST). 4. Follow the on-screen instructions to update the BIOS. 5. Restart the server when the flash update is complete. Another jumper, J38, can be used to force the system to boot from the backup POST/BIOS (manually boot to backup BIOS). Normally this action is not required, but if the primary BIOS is damaged, and ABR is not functioning properly, the jumper can be moved for troubleshooting purposes. If jumper J38 is in the backup page position, the ABR feature is disabled, regardless of the jumper J20 position, and the system will boot from the backup BIOS page. To manually boot to backup BIOS and recover primary BIOS: 1. Turn off the server and peripheral devices and disconnect power cords and all external cables; then, remove the cover. 2. Locate jumper J38 on the system board. Switch block Flash ROM page-swap jumper (J38) 123 3. Move J38 to the ″lo″ setting (pins 1 and 2) to enable BIOS recovery mode (manual boot). 4. Reconnect the power cord. 16 Hardware Maintenance Manual: xSeries 220 Type 8646

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updates the primary BIOS. The backup BIOS can be updated by moving the
primary BIOS to the backup BIOS page during the diskette flash update process.
The ABR feature can be disabled with the jumper J20; this action is not normally
required.
Note:
You can obtain a BIOS flash diskette from one of the following sources:
v
Use the ServerGuide program to make a BIOS flash diskette.
v
Download a BIOS flash diskette from the World Wide Web. Go to
IBM Server Support
, and
make the selections for your server.
To recover the BIOS, do the following:
1.
Shutdown the server
2.
Insert the BIOS flash diskette into the diskette drive.
3.
Restart the server. The system begins the power-on self-test (POST).
4.
Follow the on-screen instructions to update the BIOS.
5.
Restart the server when the flash update is complete.
Another jumper, J38, can be used to force the system to boot from the backup
POST/BIOS (manually boot to backup BIOS). Normally this action is not required,
but if the primary BIOS is damaged, and ABR is not functioning properly, the
jumper can be moved for troubleshooting purposes. If jumper J38 is in the backup
page position, the ABR feature is disabled, regardless of the jumper J20 position,
and the system will boot from the backup BIOS page.
To manually boot to backup BIOS and recover primary BIOS:
1.
Turn off the server and peripheral devices and disconnect power cords and all
external cables; then, remove the cover.
2.
Locate jumper J38 on the system board.
Flash ROM
page-swap
jumper (J38)
Switch block
1
2
3
3.
Move J38 to the
″
lo
″
setting (pins 1 and 2) to enable BIOS recovery mode
(manual boot).
4.
Reconnect the power cord.
16
Hardware Maintenance Manual: xSeries 220 Type 8646