SBE HighWire HW400c/2 Manuale Utente

 

HighWire HW400c/2 User Reference Guide Rev 1.0 

 
 

riables and commands. While most can 

be used with the HW400c/2, only a few are necessary for the boot process. A 
complete list of U-boot environment variables can be found in Appendix B . 

s

 

 

eed only be separated by a space (see Section 

 

 

 for  

the Linux kernel. Console tty is 

 

e con

rg, most of the Linux boot messages will not be displayed.  

.  bootarg lines of around 250 characters can be executed, however, storing the  bootargs in flash 

mite

l 

SBE Technical S

 

 

If bootp is used, get the IP 
address from there. Other 

pply. See section 

r setting static IP 

addresses 

. 

 

ultiple 

 followed by a space, 

e semi colon must be backslash escaped or the second command will not be recorded. Example; 

 

 

 

 

 

 # set bootcmd tftpboot\; bootm 

 

 
bootdelay

  The delay time in seconds until autoboot (executes bootcmd) 

begins. A countdown is displayed on the command line. Any 

 
 
U-boot has large number of environment va

 

 
bootarg

Boot arguments. Arguments passed to the kernel. Configures the 
HW400c/2 console (debug) port for the Linux kernel, the location of 
the IP address, if not static, the NFS device, and the NFS root path.
Multiple bootargs n
5.5.2.1). Sample bootargs; 

 

console=ttyMM0,9600n8 

Console port configuration

ttyMM0, 9600 baud, 8 bits, no 
parity.  

sole

 boota

1. Without th
2

memory is li

d to 80 characters. See Table 10. If you need extra room for bootargs, please cal
upport. 

 
           ip=bootp

settings a
5.5.2.2 fo

 
  nfsroot=/opt/gentoo 

 

NFS root file path

 
  root=/dev/nfs 

rw 

NFS root device. 

 

The name of the bootfile, e.g. uImage 

bootfile 
 
bootcmd

Boot commands executed during automatic boot (autoboot). M
commands must be separated by a semi colon
followed by the next command.  

Th

October 10, 2006 

Copyright 2006, SBE, Inc. 

Page 

77