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System Image Handling
8.3 Boot Procedure and Bootloader
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 “startup-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. Figure
8-2 illustrates the boot procedure.
Figure 8-2: Boot Procedure
There are two situations during bootstrap during which the bootloader takes control. The bootstrap
application checks the status of the Reset button 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
interrupted or corrupted application image downloads. When the bootloader is started, the LED
ACT is blinking on the front panel of the SmartNode to display this state. When downloading an
application image the bootstrap only switches to the newly loaded application image if it is valid.
Otherwise the bootstrap will still use the previous application image if the download was not
successful.
If the application image is valid it is started, and SmartWare is brought into operation module by
module. During this system initialization phase the status of the Reset button on the back plane of
the SmartNode is checked. If the button has been pressed the factory configuration is loaded into the
volatile memory and is used to parameterize SmartWare. If the button has not been pressed the
startup configuration is loaded into the volatile memory and is used to parameterize SmartWare.
Software Configuration Guide Release 2.10, Revision 1.00
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