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Arcom Embedded Linux Technical Manual RedBoot

RedBoot

RedBoot is a complete bootstrap environment for embedded systems. Based on the

eCos Hardware Abstraction Layer, RedBoot inherits the eCos qualities of reliability,

compactness, configurability and portability.

The primary function of RedBoot is to bring up the board to the point where control can

be handed off to another operating system, such as Linux. However, RedBoot also

offers the facility to download binary images via a serial or Ethernet connection and to

update the on-board Flash array.

Ethernet download and debug support is included. RedBoot can configure its IP

parameters via BOOTP, DHCP or statically via the Flash configuration block. Images

can be downloaded via Ethernet using TFTP or HTTP, or over a serial connection using

X- or Y-modem.

The RedBoot command line

RedBoot provides an interactive command line interface which allows management of

Flash images, image download, RedBoot configuration, and so on. The command line

interface is accessible via the serial console or as a telnet connection via Ethernet. If,

however, the target has been configured with a boot script that launches an application

or operating system, the Ethernet console is not available and so you must use the

serial console. Any boot script that has been configured can be aborted by pressing

Ctrl-C on the serial console during the early stages of the boot process. Once the board

has dropped to a RedBoot prompt, you may use either the serial console or telnet via

port 9000.

Configuring and using RedBoot

This section explains how to download images, update the Flash and execute

applications and operating systems. For information about the more advanced features

of RedBoot, refer to the eCos Reference manual, which is on the Development Kit CD

in the folder /manuals/.

You can find out about an individual RedBoot command by typing:

RedBoot> help <command name>

The RedBoot Flash configuration block

RedBoot contains a Flash configuration system that includes information such as a boot

script and networking configuration. The options can be examined and modified using

the fconfig command.

If called with no parameters, fconfig prompts you for each available option in turn.

Alternatively, when entering fconfig, you can include the following parameters:

fconfig [-i] [-l] [-n] [-d] nickname [value]

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