UM0851 datasheet(19/245 Pages) STMICROELECTRONICS

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UM0851

Boot loader overview

Doc ID 16604 Rev 2

19/245

Network commands

cmp

Memory compare

cmp.b 0x1300000 0x1600000

0x200000

Memory copy

cp.b 0x1300000 0x1600000

0x300000

writemac

Write MAC address in I2C memory

This command writes 0x55 and 0xAA

as magic number(to say that MAC id is

present here) at offset 0 and 1 in the

chip and stores the MAC address from

offset 2

writemac 00:99:88:77:66:55

protect

Enable or disable Flash write protection protect off 1:0-5

Table 4.

Network U-Boot commands

Command

Behavior

Example

bootp

Boot image via network using

BootP/TFTP protocol

bootp 0x1600000 uImage

cdp

Perform CDP network configuration

dhcp

Invoke DHCP client to obtain IP/boot

parameters

Nfs

Boot image via network using NFS

protocol

ping

Send ICMP echo request to network

host

ping 192.168.1.1

tftpboot

Boot image via network using TFTP

protocol

tftpboot 0x1300000 uImage

rarpboot

Boot image via network using

RARP/TFTP protocol

writemac

Write MAC address in I2C memory

This command writes 0x55 and 0xAA

as magic number(to say that MAC id is

present here) at offset 0 and 1 in the

chip and stores the MAC address from

offset 2

writemac 00:99:88:77:66:55

Table 3.

Persistent storage U-Boot commands (I2C, NOR, NAND) (continued)

Command

Behavior

Example

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