Boot Options
Basic System Configuration Guide 195
Configuration and Image Loading
When the system executes the boot.ldr file, the initialization parameters from the BOF are
processed. Three locations can be configured for the system to search for the files that
contains the runtime image. The locations can be local or remote. The first location searched
is the primary image location. If not found, the secondary image location is searched, and
lastly, the tertiary image location is searched.
If the BOF cannot be found or loaded, then the system enters a console message dialog
session prompting the user to enter alternate file locations and file names.
The boot.ldr can be interrupted during the boot sequence by pressing any key on the CPM
console port. The operator must then type sros and press ENTER within 30 seconds or the
boot.ldr will continue trying to boot the system. This key sequence ensures that noise or
misconfiguration does not inadvertently interrupt the boot sequence. If the operator types
sros and presses ENTER within 30 seconds, they are brought to a console message dialog
session prompting the user to enter file locations and other boot information.
When the runtime image is successfully loaded, control is passed from the bootstrap loader
to the image. The runtime image attempts to locate the configuration file as configured in the
BOF. Like the runtime image, three locations can be configured for the system to search for
the configuration file. The locations can be local or remote. The first location searched is the
primary configuration location. If not found, the secondary configuration location is
searched, and lastly, the tertiary configuration location is searched. The configuration file
includes chassis, card, MDA, and port configurations, as well as system, routing, and service
configurations.
Figure 9 displays the boot sequence.
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