UM1535 datasheet(16/39 Pages) STMICROELECTRONICS

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Working with pre-flashed software

UM1535

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Doc ID 023036 Rev 2

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, configure the host address as follows:

# ifconfig eth0 192.168.1.1 broadcast 192.168.1.255 netmask

255.255.255.0

In this example we are assuming that evaluation board is connected to Ethernet port 0

(eth0) of the host machine.

You can configure the IP on the evaluation board side in a static or dynamic way.

For a static configuration, the procedure is as follows:

Reset the board and enter U-Boot mode

Use the following commands to configure environment variables:

> setenv ipaddr 192.168.1.10

> setenv serverip 192.168.1.1

> setenv gatewayip 192.168.1.1

> setenv netmask 255.255.255.0

> setenv hostname SPEAR

Set the root path as path of your NFS file system. If you are using STLinux2.4 as NFS

file system then your root path will be:

–

For Armv5 SoCs:

> setenv rootpath /opt/STM/STLinux-2.4/devkit/armv5/target

–

For Armv7 SoCs:

> setenv rootpath /opt/STM/STLinux-2.4/devkit/armv7/target

Default bootargs contain an environment variable named nfsboot. This variable uses

the environment variables above. If extra information is required, the environment

variable othbootargs can be used.

As final step, modify bootargs with nfsboot. Execute the following command for this

> run nfsboot

In this way, network settings work inside U-Boot and are also automatically passed to Linux.

The dynamic configuration requires a DHCP server running on the LAN (for example, on a

Linux host PC) so that the evaluation board automatically gets an IP address at each

bootstrap.

To check if the DHCP server (daemon) support is available on the PC-side, use the following

command:

$ rpm -q dhcp

If the DHCP package is not available, install it on the PC from your distribution media (for

example, Fedora Linux CDROM or website).

The next step is to create or change the DHCP configuration file /etc/dhcp/dhcpd.conf that

matches a specific network setup, as shown in the following example:

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