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IBM® xSeries 150 : User’s Reference
Recovering BIOS
If the BIOS has become corrupted, such as from a power failure during a flash update,
you can recover the BIOS using the recovery boot block and a BIOS flash diskette.
Note: You can obtain a BIOS flash diskette from one of the following sources:
• Use the ServerGuide program to make a BIOS flash diskette.
• Download a BIOS flash diskette from the World Wide Web. Go to
http://www.pc.ibm.com/support/, select IBM Server Support, and
make the selections for your server.
• Contact your IBM service representative.
The flash memory of your server contains a protected area that cannot be overwritten.
The recovery boot block is a section of code in this protected area that enables the
server to start up and to read a flash diskette. The flash utility recovers the system
BIOS from the BIOS recovery files on the diskette.
To recover the BIOS:
1. Turn off the server and peripheral devices and disconnect all external cables and
power cords; then, remove the cover.
2. Locate the boot block jumper block (J37) on the system board.
3. Place a jumper on pins 2 and 3 to enable BIOS recovery mode.
4. Insert the BIOS flash diskette into the diskette drive.
5. Restart the server.
The Recovery Boot screen will appear. A progress report, Loading data from
diskette
xx
%, is displayed. When programming is underway, a further progress
report, Programming block
n of 7 yy%
, is displayed. When the procedure
Boot block
jumper (J37)