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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 software 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 file from an Ext2 filesystem

ext2ls List files in a directory (default /)

false Do nothing, unsuccessfully

fatinfo Print information about filesystem

fatload Load binary file from a dos filesystem

fatls List files in a directory (default /)

fdt Flattened device tree utility commands

fsinfo Print information about filesystems

fsload Load binary file from a filesystem image

go Start application at address 'addr'

grepenv Search environment variables

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 70 71

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