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COMe-P2020 User Guide

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

Kontron’s COMe-cP2020 module. This software is pre-installed at the facotory and is ready for use on powerup.

This user guide 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 relevant, 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-cP2020. The blue-shaded table cells

indicate standard U-Boot commands tested by Kontron. Only the standard U-Boot commands relevant for the normal oper-

ation of the COMe-cP2020 U-Boot bootloader have been tested by Kontron.

Table 6-1: Standard U-Boot Commands Configured for the COMe-cP2020

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

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