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10 BIOS Operation
Kontron User's Guide ETX CD 86
10.5 Preventing Problems When Updating or Restoring BIOS
Updating the BIOS represents a potential hazard. Power failures or fluctuations that may occur during
updating the Flash ROM can damage the BIOS code, making the system unbootable.
To prevent this potential hazard, many systems come with a boot-block Flash ROM. The boot-block
region contains a fail-safe recovery routine. If the boot-block code finds a corrupted BIOS (checksum
fails), it boots into the crisis recovery mode and loads a BIOS image from a crisis diskette (see above).
Additionally, the end user can insert an update key into the serial port (COM1 only) to force initiating
the recovery routine for the boot block.