BECKHOFF CB4052 - Manual (Page 62)

Chapter: BIOS update Exit Without Saving
page 62 Beckhoff New Automation Technology CB4052
6 BIOS update
If a BIOS update becomes necessary, the program “AWDFLASH.EXE” from Phoenix Technologies is
used for this. It is important, that the program is started from a DOS environment without a virtual memory
manager such as for example “EMM386.EXE”. In case such a memory manager is loaded, the program
will stop with an error message.
The system must not be interrupted during the flash process, otherwise the update is stopped and the
BIOS is destroyed afterwards.
The program should be started as follows:
awdflash [biosfilename] /sn /cc /cp
/sn Do not save the current BIOS
/cc Clear the CMOS
/cp Clear the PnP information
The erasure of CMOS and PnP is strongly recommended. This ensures, that the new BIOS works
correctly and that all chipset registers, which were saved in the setup, are reinitialized through the BIOS.
DMI should only be erased (option /cd) if the BIOS supplier advises to do so.
A complete description of all valid parameters is shown with the parameter “/?”.
In order to make the updating process run automatically, the parameter “/py” must be added. This
parameter bypasses all security checks during programming.
C
AUTION
Updating the BIOS in an improper way can render the board unusable. Therefore, you should only update
the BIOS if you really need the changes/corrections which come with the new BIOS version.
C AUTION
Before you proceed to update the BIOS you need to make absolutely sure that you have the right BIOS
file which was issued for the exact board and exact board revision that you wish to update. If you try to
update the BIOS using the wrong file the board will not start up again.