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TEK-CPCI-1000 Technical Reference Manual
6.5
BIOS BOOT OPTIONS
By default, the board boots with the BIOS contained in the Boot Block Flash. The Boot
Block Flash consists of a flash memory device with verification and protection features. It
merges the entire BIOS code and a protected emergency code.
The Boot Block Flash appears as the easiest way to upgrade the board's BIOS as its version
changes, or in case of a programming error or a data corruption.
The board provides an emergency boot jumper (W5) in the case of a BIOS corruption: when
it is enabled (jumper W5 shorted), an emergency procedure is executed to update the BIOS
code from a DOS file located on an emergency disk.
NOTE
A BIOS corruption is one of the symptoms of a non-functional board:
it may be caused by an electrical shutdown that occurs before a BIOS
update operation is completed.
The complete procedure to execute an emergency boot is described in Section F.2
(Emergency Procedure).
6.6
INSTALLING SUPERVISOR UTILITIES
6.6.1 Supervisor I/O Registers
Supervisor I/O registers are provided to configure and control special features of the board
such as: watchdog, Flash, RS-422/RS-485 mode, and power fail output. These registers are
two 8-bit registers locatable at three different I/O addresses, 190h/193h, 290h/293h or
390h/393h, using the W3 jumper.
6-8
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