SBE HighWire HW400c/2 User Manual

 

HighWire HW400c/2 User Reference Guide Rev 1.0 

 

 
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.  

 

 
 
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