UM0851 datasheet(20/245 Pages) STMICROELECTRONICS

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Boot loader overview

UM0851

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Doc ID 16604 Rev 2

Image booting commands

Environment variable commands

Serial i/f commands

Table 5.

Image booting U-Boot commands

Command

Behavior

Example

Autoscr

Run script from memory

autoscr 0x1600000

## Executing script at 01300000

Boot

Boot default, for example ‘run bootcmd’

Bootd

Boot default, for example ‘run bootcmd’

Start application at address ‘addr’

go 0x1300000

## Starting application at

0x01300000 ...

Bootm

Boot application image from memory

bootm 0x1600000

Table 6.

Environment variables U-Boot commands

Command

Behavior

Example

echo

Echo args to console

echo abcd

abcd

echo $(bootdelay)

printenv

Print environment variables

run

Run commands in an environment

variable

echo $(bootcmd)

bootm 0xf8050000

run bootcmd

saveenv

Save environment variables to

persistent storage

setenv

Set environment variables

Table 7.

Serial i/f file loading U-Boot commands

Command

Behavior

Example

coninfo

Print console devices ad information

Coninfo

loads

Load S-record file over serial line

loads 0x1300000

loady

Load binary file over serial line

(ymodem mode)

loady 0x1300000

loadb

Load binary file over serial line (kermit

mode)

loadb 0x1300000

saves

Save S-Record file over serial line

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