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L-Switch User Manual 35 LOYTEC
Version 6.0 LOYTEC electronics GmbH
7 Updating the L-Switch XP
Firmware
The L-Switch XP firmware supports remote upgrade over the network and the serial
console.
To guarantee that the L-Switch XP cannot be destroyed due to a failed firmware update the
L-Switch XP firmware consists of two images:

Fall-back image

L-Switch XP application image
The fall-back image is write protected in flash memory and provides everything needed to
talk to the L-Switch XP platform over the network. The L-Switch XP application image is
designed to be updated over the network whenever there is a need to do so.
The fall-back image makes sure that the L-Switch XP comes up in a status where the
maintenance software can at least talk to the L-Switch XP platform and can download a new
L-Switch XP application image.
When the L-Switch XP boots up with the fall-back image, all port LEDs are flashing red. In
this state it does not forward any messages.
7.1 Firmware Update via the Network
Basically firmware downloads can be performed on every L-Switch XP port. However,
since the L-Switch XP is not based on a Neuron Chip a new firmware image cannot be
downloaded with a standard tool. Rather, a designated tool, the LSD Tool (see Section 9),
must be used. See the LSD Tool documentation for details on how to download a new
L-Switch XP firmware via the network.
7.2 Firmware Update via the Console
To download the firmware via the console the L-Switch XP must be connected to the
RS-232 port of a PC via its console interface as described in Section 5.3. You will need the
LOYTEC serial upgrade tool (LSU Tool), which can be downloaded from our homepage at
www.loytec.com .
Please make sure that the L-Switch XP console shows the main menu otherwise navigate to
the main menu or simply reset the L-Switch XP.
Double click on the *.dlc file that comes with the new firmware package. This should start
the LSU Tool and load the firmware image referenced in the dlc file. Please note that the
dlc file and the dl file must be stored in the same folder. The start window of the LSU tool
is shown in Figure 25.