SCS P4dragon DR-7800, Installation Manual

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9. Configuration switches
9 Configuration switches
The
P4
dragon
has 3 DIP switches to do some basic configuration.
9.1 Rear side configuration switch
Figure 29: Configuration switches
This switch has 4 positions with different meanings. All of these can be switched on or off. ON
means that the switch is set to the lower position, OFF is the higher position. When set to ON,
the labeled condition is enabled.
9.1.1 ON switch
This switch enables the “permanent ON” feature which is described in chapter 5.1.1.
9.1.2 BIOS switch
This switch enables the Bootloader of the
P4
dragon
. The Bootloader allows some of the basic
functions
P4
dragon
of the system to be used and works totally independently from the
presently loaded firmware. The Bootloader has a very basic and essential task, and is thus is
placed in a specially protected area of the FLASH memory.
Normally, the user does not need to worry about the existence of the Bootloader. However due
to various unlucky or exceptional circumstances, it is possible that the
P4
dragon will no longer
load the PACTOR firmware. Under these conditions, it could only possible to access the
P4
dragon
via the BIOS.
If, for example, there is a power failure during a normal firmware update, one part of the
FLASH is programmed with the new version, while the other still contains a part of the old
firmware. It is very unlikely that such a mixture will run, and the Bootloader is then the only
way the system can be recovered.
The BIOS is automatically activated as soon as the
P4
dragon detects an error on loading the
PACTOR firmware, or the user wishes access to the BIOS by setting the DIP-switch to ON.
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