Users Guide

60
u-Boot
All commands in this chapter are in u-Boot and are supported on the Dell Networking S4810 and 4820T platforms only.
To access this mode, press any key when the following line appears on the console during a system boot.
Hit any key to stop autoboot:
Enter u-Boot immediately, as the => prompt indicates.
NOTE: This chapter describes only a few commands available in u-Boot. The commands included here are those
commands that are comparable to those commands found in Boot User mode on other S-Series systems.
NOTE: You cannot use the Tab key to complete commands in this mode.
printenv
Display the current system boot variable and other system settings.
Syntax
printenv
Command Modes uBoot
Command History
This guide is platform-specic. For command information about other platforms, refer to the relevant Dell
Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version 8.3.19.0 Introduced on the S4820T.
Version 8.3.7.0 Introduced on the S4810.
Example
=> printenv
baudrate=9600
uboot_filesize=0x80000
bootfile=FTOS-SC-1.2.0.0E3.bin
bootcmd=echo Booting primary bootline....;$primary_boot;boot;echo
Failed;echo Booting secondary bootline....;$secondary_boot;boot;echo
Failed;echo Booting default bootline....;$default_boot;boot;echo
Failed;echo
Rebooting...;reset
bootdelay=5
loads_echo=1
rootpath=/opt/nfsroot
hostname=unknown
loadaddr=640000
ftpuser=force10
ftppasswd=force10
uboot=u-boot.bin
tftpflash=tftpboot $loadaddr $uboot; protect off 0xfff80000 +$filesize;
erase 0x
fff80000 +$filesize; cp.b $loadaddr 0xfff80000 $filesize; protect on
0xfff80000
1508
u-Boot