MINI-LINK BAS 9-18
Technical Description EN/LZB 111 0542 P2B
9.7.7 Start Control Processor in “Upgrade mode”
The software upgrade procedure requires that all the CP applications
are not running. Only the equipment handling process is started. This
operational mode of the CP is called “upgrade mode”.
9.7.8 Execute Upgrade
This step corresponds to what is usually referred as swap action. In
other words, provided that the previous steps have been completed
successfully, the system is now fully prepared for the activation of the
new software modules. Each board has properly received the new load
module (placed in the passive memory) and is waiting for a swap
command.
The following actions are done in this step:
• Read of CP baseline configuration file.
• Ask each upgradeable to notify which load module (type and
revision) is present on the passive and active memories.
• Execute the proper action, swap and download & swap, or no
action.
The previous steps are needed to guarantee a robust behaviour of the
procedure in any possible case. As the download of the load modules
is an action totally independent from the swap, there is no possibility
to guarantee that in the meantime the hardware/software configuration
of the deployed network has not been change. For example, a
hardware failure after the download step as described in Paragraph
9.7.2 could require the substitution of a board: in principle, the spare
board could have a different software version not aligned with the new
baseline, see the Note. Therefore, it is safe to check the load modules
present on the passive and active memory of each upgradeable object
immediately before executing the swap, and include also a new
download, if needed.
Differently from all the previous steps, this operation is forcing a
traffic interruption.
Note: The spare board could be even so new that it already has
the load module corresponding to the new baseline in the
active memory. This is the reason why this step could
imply no action.
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