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6 u-boot, 1 introduction to u-boot, 2 standard u-boot commands – Kontron COMe-bP5020 User Manual

Page 47: U-boot, Introduction to u-boot, Standard u-boot commands

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47

User Guide

COMe-bP5020

6 U-Boot

6.1 Introduction to U-Boot

U-Boot is an open source bootloader software developed and maintained by DENX Software Engineering GmbH (http://
www.denx.de). Kontron provides U-Boot with all its standard features as well as Kontron-specific features for usage with Kon-
tron’s COMe-bP5020 module. This sof tware is pre-installed at the factory and is ready for use on power-up.

This chapter provides specific information on Kontron’s implementation of U-Boot and its usage. Please refer to the DENX web
site for up-to-date on-line documentation of all of U-Boot’s standard features.

6.2 Standard U-Boot Commands

U-Boot is provided with a set of standard commands for which documentation is available on the DENX web site. Some of the
standard commands have sub-groups which can be displayed when help for the main group command is requested. Where rel-
evant, further information concerning the usage of standard commands is provided in this guide to assist users in performing
specific functions.

The following table indicates the standard U-boot commands configured for the COMe-bP5020. The blue-shaded table cells in-
dicate standard U-Boot commands tested by Kontron. Only the standard U-Boot commands relevant for the normal operation
of the COMe-bP5020 U-Boot bootloader have been tested by Kontron.
Table 41: Standard U- Boot Commands Configured for the COMe-bP5020

COMMAND

DESCRIPTION

?

Alias for 'help'

base

Print or set address offset

bdinfo

Print Board Info structure

boot

Boot default, i.e., run 'bootcmd'

bootd

Boot default, i.e., run 'bootcmd'

bootelf

Boot from an ELF image in memory

bootm

Boot application image from memory

bootp

Boot image via network using BOOTP/TFTP protocol

bootvx

Boot vxWorks from an ELF image

chpart

Change active partition

cmp

Memory compare

coninfo

Print console devices and information

cp

Memory copy

cpu

Multiprocessor CPU boot manipulation and release

crc32

Checksum calculation

dhcp

Boot image via network using DHCP/TFTP protocol

echo

Echo args to console

editenv

Edit environment variable

env

Environment handling commands

errata

Report errata workarounds

exit

Exit script

ext2load

Load binary f ile from an Ext2 f ilesystem

ext2ls

List files in a directory (default /)

false

Do nothing, unsuccessfully

fatinfo

Print information about f ilesystem

fatload

Load binary f ile from a dos filesystem

fatls

List files in a directory (default /)

fdt

Flattened device tree utility commands

fsinfo

Print information about f ilesystems

fsload

Load binary f ile from a f ilesystem image

go

Start application at address 'addr'

grepenv

Search environment variables