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The command “run” allows to execute variables as sequence od commands.
Here values of other variables could be used to simplify the scripts. (e.g. $(filesize) )
Example (A9M24x0):
The following variables are available:
ipaddr = 192.168.42.10
serverip = 192.168.42.1
loadaddress = 0x30100000
bootfile = uImage-a9m2410dev
setenv bootcmd tftp\;bootm
This command is identical with:
setenv bootcmd tftp 30100000 uImage-a9m2410dev\;bootm 30100000
and:
setenv bootcmd tftp 30100000 $(bootfile)\;bootm 30100000
User keys
Note: CC9P9360/9750 and A9M2410/2440 only
There are two User Keys on the development board, which can be used with functions
from U-Boot. It is common to use them for booting different kernel versions or using
different rootfs. For example:
When User Key 1 is pressed in the start phase of U-Boot, the contents of the variable
“key1” is executed, i.e. the target will boot from a USB medium.
When User Key 2 is pressed the target boots via TFTP/NFS.
# setenv key1 run boot_usb
# setenv key2 run boot_net
# saveenv