UM0851 datasheet(17/245 Pages) STMICROELECTRONICS

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UM0851

Boot loader overview

Doc ID 16604 Rev 2

17/245

ping

- send ICMP ECHO_REQUEST to network host

printenv- print environment variables

protect - enable or disable FLASH write protection

rarpboot- boot image via network using RARP/TFTP protocol

reset

- Perform RESET of the CPU

run

- run commands in an environment variable

saveenv - save environment variables to persistent storage

saves

- save S-Record file over serial line

setenv

- set environment variables

setfreq - change ddr/cpu frequency

sleep

- delay execution for some time

tftpboot- boot image via network using TFTP protocol

version - print monitor version

writemac - write mac address in I2C memory

Commands can be grouped into the following categories, according to their function:

Informative commands

This group of commands is used to get runtime information concerning the system itself. For

example, using the 'bdinfo' command, you can retrieve the XLoader image revision.

Memory commands

U-Boot offers the possibility to interact with the memory subsystem (RAM, ROM, Flash, …)

using a set of basic commands to move data to/from memory, compare memory locations,

change memory locations and test memory.

Table 1.

Informative U-Boot commands

Command

Behavior

Example

bdinfo

Print board info structure

Along with other things, this structure

also contains

– Frequency at which DDR is operating

– DDR type (DDR2/DDRMOBILE)

– XLoader revision

spear600> bdinfo

arch_number = 0x000008BC

env_t

= 0x00000000

boot_params = 0x00000100

DRAM bank

= 0x00000000

-> start

= 0x00000000

-> size

= 0x08000000

DDR Freq

= 333

DDR Type

= DDR2

ethaddr

= 55:66:77:88:99:00

ip_addr

= 192.168.1.10

baudrate

= 115200 bps

XLoader Rev = XLoader-SPEAr600

help

Print online help

version

Print monitor version

Table 2.

Memory U-Boot commands

Command

Behavior

Example

base

Print or set address offset for memory

commands

base 0x1300000

Memory display

md 0x1300000

Memory modify (auto-incrementing)

mm 0x1300000

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