UM1535 datasheet(30/39 Pages) STMICROELECTRONICS

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Working with customized kernels

UM1535

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Doc ID 023036 Rev 2

or change it into a comment line by putting a hash character in front of it. An example of

TFTP file configuration is shown below:

service tftp

{

socket_type

= dgram

protocol

= udp

wait

= yes

user

= root

server

= /usr/sbin/in.tftpd

server_args

= -c -v -s /tftpboot

disable

= no

per_source

= 11

cps

= 100 2

flags

= IPv4

}

Also, make sure that the /tftpboot directory exists and is word-readable (permissions at least

"dr-xr-xr-x"), and remember to disable the firewall if present (or make new rules to allow

TFTP traffic).

The firewall can be disabled as in the following example command:

# /etc/init.d/iptables stop

Please note that server_args keeps the default search path for TFTP daemon. This is useful

for specifying file names omitting this path on the TFTP client side (target). After this, restart

the xinetd daemon to force it to reload the new configuration. Type the following command

from the host PC prompt:

# service xinetd restart

Stopping xinetd: [OK]

Starting xinetd: [OK]

6.3.2

Updating the kernel on Flash memory by U-Boot

You can use U-Boot and TFTP transfer to write a new kernel image on Flash memory.

For example, use the following procedure to update the kernel on serial NOR Flash for the

SPEAR1300EVAL evaluation board:

Press the space key to enter U-Boot autoboot

Configure network parameters (statically or with DHCP, see relevant sections)

Start the TFTP server on the host machine

Place the desired image in the host PC TFTP root directory

(for example, /tftpboot/uImage_new.img)

From the U-Boot console, download the image to RAM (here we use address 0x0) with

TFTP client:

> tftp 0x0 uImage_new.img

Erase the specified kernel area on serial NOR:

> erase 0:5-31

Write the image on serial NOR (you need to know the image size). In this example we

copied 1663104 bytes (0x196080 in hexadecimal) to the start of the kernel area on

serial NOR (0xF8050000 in hexadecimal):

> cp.b 0x0 0xF8050000 0x196080

Reboot the evaluation board

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