E-DOC-CTC-20071119-0003 v1.0
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3| Firmware Upgrade
and Configuration Upda
te
Conclusion
The firmware upgrade process has following characteristics:
Robustness: this firmware upgrade process is rather robust.
Whenever something goes wrong while downloading or flashing a new firmware image, there is always
a valid firmware image present in Flash. When the Thomson Gateway detects that the downloaded file is
invalid or when there is a problem loading the file, the file system automatically remounts the partitions
to load the old firmware image.
In this case, no fault message is sent to the ACS, but the Inform RPC before the TransferComplete RPC
includes the old SoftwareVersion value in the ParameterList argument. An ACS should only consider a
firmware upgrade to be successful if the SoftwareVersion value is the expected version.
This mechanism is considerably more fail-save than the single memory bank firmware upgrade
mechanism.
Service interruption: step 4, when the Thomson Gateway reboots to load and run the new firmware, is
the service interrupting step. Up till that point, all services are running and active.
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