UM0844 datasheet(16/43 Pages) STMICROELECTRONICS

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UM0844

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Doc ID 16544 Rev 3

bootargs=console=ttyS0 mem=128M root=/dev/mtdblock3

rootfstype=jffs2

bootcmd=bootm 0xf8050000

bootdelay=1

baudrate=115200

ethaddr=00:11:22:33:44:55

ipaddr=192.168.1.10

serverip=192.168.1.1

gatewayip=192.168.1.1

netmask=255.255.255.0

stdin=serial

stdout=serial

stderr=serial

verify=n

Environment size: 283/8188 bytes

2.6.3

Advanced commands

More advanced usage of U-Boot includes commands for:

●

Reading and writing embedded MPU registers and memory areas

●

Executing the contents of an environment variable, handling it as a script (sequence of

U-Boot commands)

●

Checking Ethernet link between the target board and the host PC (ping)

●

Booting the Linux kernel from Ethernet network (by TFTP) instead of using a kernel on

Flash memory (bootm, tftp, tftpboot).

2.7

Connecting the evaluation board to a LAN

The evaluation board should be connected to a developer's host PC over a private LAN or

even a point-to-point link. Commonly used private IP addresses (Class C) are in the range

of192.168.0.0 - 192.168.255.255.

Note:

Some SPEAr evaluation boards (currently EVALSPEAR310 and EVALSPEAR320) provide

multiple Ethernet ports. Each port requires a different IP address. The procedure described

below is applicable to a single port, usually the one used for software development.

As an example, let's assume an IPv4 local area network with the following characteristics:

Network IPs:

192.168.1.X

Host PC IP:

192.168.1.1

Evaluation board IP:192.168.1.10

On a Linux PC, you must configure the host address as follows:

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