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2
Executed exclusively by Service
Siemens AG
ICM CP
1. The authorisation for making an update is checked. It is necessary to ensure that
the user is authorised and to check whether the SIMpad SL4 does indeed have an
old version of the standard software.
2. If these details permit an update, the software update program then checks the
available storage space in the RAM and flash store on the SIMpad SL4. If the
storage should be inadequate, the user is requested to delete data or to store it in
backup files on the PC.
3. The server now gives a choice of available software images that can be
downloaded. The user may change the language version provided that such an
image is available on the server.
4. The software image has about 22 MB and is loaded into the Object Store of the
RAM memory. The duration of this loading operation depends on the transmission
rate. In addition, heavy load on the server due to many clients downloading
simultaneously can also delay the loading operation. Experience shows that under
normal circumstances it will take about 60 minutes over an ISDN line (64 kbps)
and 15 minutes over an ADSL line (256 kbps). During the loading operation, a
status display keeps the user informed.
5. After the image has been successfully loaded, preparations will be made for the
operation to copy it into flash memory. In order to ensure problem-free execution
of the copying operation the battery charge is checked and the 'off' switch is
blocked. In addition, a special warning is issued to the user, indicating the copying
operation is now about to be performed. This copying operation is critical, because
if it is interrupted the SIMpad SL4 could be left in an inconsistent state, from which
it could no longer be started. This inconsistent state could only be remedied by
downloading a new image from a service PC
6. The copying operation is started by a confirmatory input from the user. As with the
loading operation, so again with the copying operation (lasting about 5 minutes),
the status is displayed.
7. When the copying operation has been carried out, the update program will carry
out error checks and modifications as necessary, and then finally will initiate a
restart.
If the download process is interrupted it will be continued at the same stage as soon as
re-connected. The client will tell its status and ask the rest from the server.
Technical Description
2
(see Fig. 9 ).
20.08.01, David Brunner
SIMpad SL4
Version V2.0
60/74
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