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><A
NAME="CALMRISC16">CalmRISC/CalmRISC16 Samsung CalmRISC16 Core Evaluation Board</H1
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN6447">Overview</H2
><P
> The
Samsung CalmRISC16 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 calmRISC16 is a
harvard architecture with separate 22-bit program and data addresses. The
instruction set provides no instruction for writing to program memory. The
MDSChip board firmware (called CalmBreaker) provides 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.</P
><P
>The following RedBoot configurations are supported:
<DIV
CLASS="INFORMALTABLE"
><A
NAME="AEN6457"><P
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><THEAD
><TR
><TH
ALIGN="LEFT"
VALIGN="TOP"
>Configuration</TH
><TH
ALIGN="LEFT"
VALIGN="TOP"
>Mode</TH
><TH
ALIGN="LEFT"
VALIGN="TOP"
>Description</TH
><TH
ALIGN="LEFT"
VALIGN="TOP"
>File</TH
></TR
></THEAD
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
>ROM</TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>[ROM]</TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>RedBoot running via the MDSChip board.</TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>redboot_ROM.ecm</TD
></TR
></TBODY
></TABLE
><P
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><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN6471">Initial Installation Method</H2
><P
>The CalmRISC16 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:
<TT
CLASS="FILENAME"
>packages/hal/calmrisc16/ceb/current/support</TT
></P
><P
>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:
<TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
>$ <TT
CLASS="USERINPUT"
><B
>calmbreaker -p /dev/term/b --reset --srec-code -f redboot.elf</B
></TT
></PRE
></TD
></TR
></TABLE
>
Note that the '-p /dev/term/b' specifies the serial port to use and will vary
from system to system. The download will take about two minutes. After it
finishes, start RedBoot with:
<TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
>$ <TT
CLASS="USERINPUT"
><B
>calmbreaker -p /dev/term/b --run</B
></TT
></PRE
></TD
></TR
></TABLE
>
The 'Run' LED on the core board should be on. Connecting to the MDSboard with
a terminal and typing enter should result in RedBoot reprinting the command
prompt.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN6480">Special RedBoot Commands</H2
><P
>None.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN6483">Special Note on Serial Channel</H2
><P
>The MDSChip board uses a relatively slow microcontroller to provide
the pseudo-register interface to the core board. This pseudo-register
interface provides access to the serial channel and write access to program
memory. Those interfaces are slow and the serial channel is easily overrun
by a fast host. For this reason, GDB must be told to limit the size of code
download packets to avoid serial overrun. This is done with the following
GDB command:
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>(gdb) <TT
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><B
>set download-write-size 25</B
></TT
></PRE
></TD
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></P
></DIV
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CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN6488">Rebuilding RedBoot</H2
><P
>These shell variables provide the platform-specific information
needed for building RedBoot according to the procedure described in
<A
HREF="rebuilding-redboot.html"
>Chapter 3</A
>:
<TABLE
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><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>export TARGET=calm16_ceb
export ARCH_DIR=calmrisc16
export PLATFORM_DIR=ceb</PRE
></TD
></TR
></TABLE
></P
><P
>The names of configuration files are listed above with the
description of the associated modes.</P
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