Boot Procedure - Patton electronics SmartNode Series Software Configuration Manual

6 • System image handling SmartWare Software Configuration Guide

Boot procedure

During a normal boot procedure of a SmartNode the bootstrap application checks the persistent memory in
the logical region nvram: for an application image. Following that the application image is executed, that is
SmartWare is started module by module. Shortly before SmartWare is fully started up the configuration "star-
tup-config" is copied from the logical region nvram: of flash memory as "running-config" into the volatile
memory system: and is used to parameterize SmartWare. The boot procedure is illustrated in figure 14.
Figure 14. Boot Procedure
There are two situations during bootstrap during which the bootloader takes control. The bootstrap applica-
tion checks the status of the Reset button (not available for SN4xxx) on the back plane of the SmartNode, and
if the system button has been pressed it launches the bootloader. The bootloader is also launched if a valid
application image is not available.
The bootloader ensures that basic operations, network access and downloads are possible in cases of inter-
rupted or corrupted application image downloads. After downloading an application image the bootstrap only
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Boot procedure