WAGO 750 Series Manual page 194

190 • Bootloader (U-Boot)
Environment Variables
The following environment variables are available for a software update:
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Note
Please refer to chapter 9.2 for details on a TFTP server setup (required for a
software update)..
The following environment variables can be used to determine the standard
interfaces:
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An update of the environment variables via the Linux operating system is
executed via the device interface /dev/mtdblock5. The wagoset example
program was developed for this purpose.
ipaddr
IP address of the Linux fieldbus coupler
ethaddr
MAC address of the Linux fieldbus coupler
serverip
IP address of the TFTP server
netmask
Netmask of the network
update-rootfs
Macro for a root file system update
update-kernel
Macro for a Linux kernel update
stdin
Standard input interface
stdout
Standard output interface
sterr
Standard error output interface
baudrate
Baud rate of the serial interface
WAGO-I/O-SYSTEM 750
Linux Fieldbus Coupler