Comtrol eCos - Manual (Page 106)

Chapter 1. Getting Started with RedBoot
the RedBoot image into non-volatile storage varies from platform to platform. In general, it requires that the image
be programmed into flash in situ or programmed into the flash or ROM using a device programmer. In some cases
this will be done at manufacturing time; the platform being delivered with RedBoot already in place. In other cases,
you will have to program RedBoot into the appropriate device(s) yourself. Installing to flash in situ may require
special cabling or interface devices and software provided by the board manufacturer. The details of this installation
process for a given platform will be found in Installation and Testing. Once installed, user-specific configuration
options may be applied, using the fconfig command, providing that persistent data storage in flash is present in the
relevant RedBoot version. See
the Section called Configuring the RedBoot Environment for details.
User Interface
RedBoot provides a command line user interface (CLI). At the minimum, this interface is normally available on
a serial port on the platform. If more than one serial interface is available, RedBoot is normally configured to try
to use any one of the ports for the CLI. Once command input has been received on one port, that port is used
exclusively until the board is reset or the channel is manually changed by the user. If the platform has networking
capabilities, the RedBoot CLI is also accessible using the
telnet access protocol. By default, RedBoot runs
telnet on port TCP/9000, but this is configurable and/or settable by the user.
RedBoot also contains a set of GDB "stubs", consisting of code which supports the GDB remote protocol. GDB
stub mode is automatically invoked when the ’$’ character appears anywhere on a command line unless escaped
using the ’\’ character. The platform will remain in GDB stub mode until explicitly disconnected (via the GDB
protocol). The GDB stub mode is available regardless of the connection method; either serial or network. Note that
if a GDB connection is made via the network, then special care must be taken to preserve that connection when
running user code. eCos contains special network sharing code to allow for this situation, and can be used as a
model if this methodology is required in other OS environments.
RedBoot Editing Commands
RedBoot uses the following line editing commands.
NOTE: In this description, ^A means the character formed by typing the letter “A” while holding down the control
key.
• Delete (0x7F) or Backspace (0x08) erases the character to the left of the cursor.
• ^A moves the cursor (insertion point) to the beginning of the line.
• ^K erases all characters on the line from the cursor to the end.
• ^E positions the cursor to the end of the line.
• ^D erases the character under the cursor.
• ^F moves the cursor one character to the right.
• ^B moves the cursor one character to the left.
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