Comtrol eCos - Manual (Page 243)

Chapter 5. Installation and Testing
Rebuilding RedBoot
These shell variables provide the platform-specific information needed for building RedBoot according to the
procedure described in
Chapter 3 :
export TARGET=calm16_ceb
export ARCH_DIR=calmrisc16
export PLATFORM_DIR=ceb
The names of configuration files are listed above with the description of the associated modes.
CalmRISC/CalmRISC32 Samsung CalmRISC32 Core Evaluation Board
Overview
The Samsung CalmRISC32 evaluation platform consists of two boards connected by a ribbon cable. One board
contains the CPU core and memory. The other board is called the MDSChip board and provides the host interface.
The calmRISC32 is a harvard architecture with separate 32-bit program and data addresses. The instruction set
provides no instruction for writing to program memory. The MDSChip board firmware (called CalmBreaker) pro-
vides a pseudo register interface so that code running on the core has access to a serial channel and a mechanism to
write to program memory. The serial channel is fixed at 57600-8-N-1 by the firmware. The CalmBreaker firmware
also provides a serial protocol which allows a host to download a program and to start or stop the core board.
The following RedBoot configurations are supported:
Configuration Mode Description File
ROM [ROM] RedBoot running via the
MDSChip board. redboot_ROM.ecm
Initial Installation Method
The calmRISC32 core is controlled through the MDSChip board. There is no non-volatile storage available for
RedBoot, so RedBoot must be downloaded to the board on every power cycle. A small utility program is used to
download S-record files to the eval board. Sources and build instructions for this utility are located in the RedBoot
sources in:
packages/hal/calmrisc32/ceb/current/support
To download the RedBoot image, first press the reset button on the MDSChip board. The green ’Run’ LED on the
core board should go off. Now, use the utility to download the RedBoot image with:
$ calmbreaker -p /dev/term/b --reset --srec-code -f redboot.elf
Note that the ’-p /dev/term/b’ specifies the serial port to use and will vary from system to syetm. The download
will take about two minutes. After it finishes, start RedBoot with:
$ calmbreaker -p /dev/term/b --run
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