Kontron AM4140 U-Boot Bootloader - Manual (Page 11)

AM4140 U-Boot Bootloader U-Boot Usage
ID 1052-0281, Rev. 1.0 Page 11
P R E L I M I N A R Y
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 fea-
tures as well as Kontron-specific features for usage with Kontron’s AM4140 AMC module.
This user guide provides specific information on Kontron’s implementation of U-Boot and its us-
age. Please refer to the DENX web site for up-to-date on-line documentation of all of U-Boot’s
standard features.
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 con-
cerning 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 AM4140. The
blue-shaded table cells indicate standard U-Boot commands tested by Kontron. Only the stan-
dard U-Boot commands relevant for the normal operation of the AM4140 U-Boot bootloader
have been tested by Kontron.
Table 1: Standard U- Boot Commands Configured for the AM4140
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