190 • Bootloader (U-Boot)
Environment Variables
WAGO-I/O-SYSTEM 750
Linux Fieldbus Coupler
The following environment variables are available for a software update:
• 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
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:
• stdin
Standard input interface
• stdout
Standard output interface
• sterr
Standard error output interface
• baudrate
Baud rate of the serial interface
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.
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