📄 setup-ppc-cogent.html
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>PowerPC Cogent Hardware Setup</TITLE
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>eCos User Guide</TH
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>Appendix A. Target Setup</TD
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><H1
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><A
NAME="SETUP-PPC-COGENT">PowerPC Cogent Hardware Setup</H1
><P
>The eCos Developer’s Kit package comes with an EPROM
which provides GDB support for the Cogent
evaluation board. An image of this EPROM is also provided at
<TT
CLASS="FILENAME"
>loaders/powerpc-cogent/gdbload.bin</TT
> under
the root of your eCos installation. The same EPROM and image can
be used on all three supported daughterboards: CMA287-23 (MPC823),
CMA287-50 (MPC850), and CMA286-60 (MPC860).</P
><P
>The EPROM is installed to socket U4 on the board. Attention
should be paid to the correct orientation of the EPROM during installation. </P
><P
>If you are going to burn a new EPROM using the binary image,
be careful to get the byte order correct. It needs to be big-endian.
If the EPROM burner software has a hex-editor, check that the first
few bytes of the image look like: </P
><TABLE
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BGCOLOR="#E0E0F0"
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><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>00000000: 3c60 fff0 6063 2000 7c68 03a6 4e80 0020 <`..`c.|h..N.. </PRE
></TD
></TR
></TABLE
><P
>If the byte order is wrong you will see 603c instead of 3c60
etc. Use the EPROM burner software to make a byte-swap before you
burn to image to the EPROM. </P
><P
>If the GDB stub EPROM you burn does not work, try reversing
the byte-order, even if you think you have it the right way around.
At least one DOS-based EPROM burner program is known to have the
byte-order upside down.</P
><P
>The GDB stub in the EPROM allows communication with GDB using
the serial port at connector P12 (CMA101) or P3 (CMA102). The communication parameters
are fixed at 38400 baud, 8 data bits, no parity bit and 1 stop bit
(8-N-1). No flow control is employed. Connection to the host computer
should be made using a dedicated serial cable as specified in the
Cogent CMA manual.</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN3368">Installing the Stubs into ROM</H2
><DIV
CLASS="SECT3"
><H3
CLASS="SECT3"
><A
NAME="AEN3370">Preparing the Binaries</H3
><P
>These two binary preparation steps are not strictly necessary
as the eCos distribution ships with pre-compiled binaries in the
directory <TT
CLASS="FILENAME"
>loaders/powerpc-cogent</TT
> relative to the installation
root.</P
><DIV
CLASS="SECT4"
><H4
CLASS="SECT4"
><A
NAME="AEN3374">Building the ROM images with the eCos Configuration Tool</H4
><P
></P
><OL
TYPE="1"
><LI
><P
>Start with a new document - selecting the
<SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>File->New</I
></SPAN
>
menu item if necessary to do this.</P
></LI
><LI
><P
>Choose the
<SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Build->Templates</I
></SPAN
>
menu item, and then select the PowerPC CMA28x hardware.</P
></LI
><LI
><P
>While still displaying the
<SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Build->Templates</I
></SPAN
>
dialog box, select the “stubs” package template
to build a GDB stub. Click
<SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>OK</I
></SPAN
>.</P
></LI
><LI
><P
>Build eCos using
<SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Build->Library</I
></SPAN
>.</P
></LI
><LI
><P
>When the build completes, the image files can be found
in the bin/ subdirectory of the install tree. GDB stub
ROM images have the prefix “gdb_module”.</P
></LI
></OL
></DIV
><DIV
CLASS="SECT4"
><H4
CLASS="SECT4"
><A
NAME="AEN3392">Building the ROM images with ecosconfig</H4
><P
></P
><OL
TYPE="1"
><LI
><P
>Make an empty directory to contain the build tree,
and cd into it.</P
></LI
><LI
><P
>To build a GDB stub ROM image, enter the command:
<TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>$ ecosconfig new cma28x stubs </PRE
></TD
></TR
></TABLE
></P
></LI
><LI
><P
>Enter the commands:
<TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>$ ecosconfig tree
$ make</PRE
></TD
></TR
></TABLE
>
</P
></LI
><LI
><P
>When the build completes, the image files can be found
in the bin/ subdirectory of the install tree. GDB stub
ROM images have the prefix “gdb_module”.</P
></LI
></OL
></DIV
></DIV
><DIV
CLASS="SECT3"
><H3
CLASS="SECT3"
><A
NAME="AEN3405">Installing the Stubs into ROM or FLASH</H3
><P
></P
><OL
TYPE="1"
><LI
><P
>Program the binary image file gdb_module.bin
into ROM or FLASH referring to the instructions of your ROM programmer.</P
></LI
><LI
><P
> Plug the ROM/FLASH into socket U4 as described
at the beginning of this <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Hardware Setup</I
></SPAN
> section.</P
></LI
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