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HighWire HW400c/2 User Reference Guide Rev 1.0
5.5.1 U-boot, Universal Bootloader
The HW400c/2 uses a boot ROM based on Das U-boot. U-boot (Universal
Bootloader) is an off-the-shelf freeware package found on Sourceforge.net. Ma
commands and environment variables are available in U-boot to facilitate the
ny
loading
f the Linux kernel from various locations.
5.5.1.1 U-boot commands
There are four basic U-boot commands that are used to configure the environment
ariables for the boot environment. All commands are available at the debug>
B .
help List all commands and environment variables
printenv Print a list of all valid environment variables that are currently in use.
This command can be shortened to print.
printenv at are not set (unused
incorrect value, will not be displayed.
setenv <variable_name> <value>
Set an environment variable_name to value. Can be shortened to
set.
aveenv Save environment variable(s) to non-volatile memory. Can be
shortened to save.
o
v
prompt. A complete list of U-boot environment variables can be found in Appendix
In the command, Parameters th ), have no value assigned, or an
s
October 10, 2006 Copyright 2006, SBE, Inc. Page 76