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>NEC CEB-V850/SA1 Hardware Setup</TITLE
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>Appendix A. Target Setup</TD
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><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="SETUP-V850-CEBSA1">NEC CEB-V850/SA1 Hardware Setup</H1
><P
>The CEB-V850 board is fitted with a socketed EPROM. The internal
Flash of the V850 supplied with the CEB-V850 boards defaults to
vectoring into this EPROM. A GDB stub image should be programmed
into an EPROM fitted to this board, and a pre-built image is provided
at <TT
CLASS="FILENAME"
>loaders/v850-ceb_v850/v850sa1/gdb_module.bin </TT
>under
the root of your eCos installation.</P
><P
>The EPROM is installed to the socket labelled U7 on the board.
Attention should be paid to the correct orientation of the EPROM
during installation. </P
><P
>When programming an EPROM using the binary image, be careful
to get the byte order correct. It needs to be little-endian. If
the EPROM burner software has a hex-editor, check that the first
few bytes of the image look similar to: </P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>00000000: 0018 8007 5e02 0000 0000 0000 0000 0000</PRE
></TD
></TR
></TABLE
><P
>If the byte order is wrong you will see 1800 instead of 0018
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. 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 CEB-V850/SA1
manual.</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN4279">Installing the Stubs into ROM</H2
><DIV
CLASS="SECT3"
><H3
CLASS="SECT3"
><A
NAME="AEN4281">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 loaders/v850-ceb_v850 relative to the
installation root.</P
><DIV
CLASS="SECT4"
><H4
CLASS="SECT4"
><A
NAME="AEN4284">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 NEC CEB-V850/SA1 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="AEN4302">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 ceb-v850 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="AEN4315">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 the socket as described
at the beginning of this section.</P
></LI
></OL
></DIV
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN4322">Debugging with the NEC V850 I.C.E.</H2
><P
>eCos applications may be debugged using the NEC V850 In Circuit
Emulator (I.C.E.) A PC running Microsoft Windows is required in
order to run the NEC ICE software and drivers. In addition Red Hat
have developed a “libremote” server application
named v850ice.exe which is used on the PC connected to the I.C.E.
in order to allow connections from GDB.</P
><P
>The I.C.E. must be physically connected to a Windows NT system
through NEC"s PCI or PC Card interface. A driver, DLLs,
and application are provided by NEC to control the I.C.E.</P
><P
>v850ice is a Cygwin based server that runs on the NT system
and provides an interface between the gdb client and the I.C.E.
software. v850-elf-gdb may be run on the Windows NT system or on
a remote system. v850-elf-gdb communicates with the libremote server
using the gdb remote protocol over a TCP/IP socket. v850ice
communicates with the I.C.E. by calling functions in the NECMSG.DLL provided
by NEC.</P
><DIV
CLASS="SECT3"
><H3
CLASS="SECT3"
><A
NAME="AEN4327">INITIAL SETUP</H3
><P
></P
><OL
TYPE="1"
><LI
><P
>Configure the hardware including the I.C.E., SA1 or
SB1 Option Module, and target board. Install the interface card
in the Windows NT system. Reference NEC"s documentation
for interface installation, jumper settings, etc.</P
></LI
><LI
><P
>Install the Windows NT device driver provided by NEC.</P
></LI
><LI
><P
>Copy the NEC DLLs, MDI application, and other support
files to a directory on the Windows NT system. The standard location
is C:\NecTools32. This directory will be referred to as
the "libremote server directory" in this document. v850ice.exe must
also be copied to this directory after being built. The required
files are: cpu.cfg, Nec.cfg, MDI.EXE, NECMSG.DLL, EX85032.DLL,
V850E.DLL, IE850.MON, IE850E.MON, and D3037A.800.</P
></LI
><LI
><P
>Make certain the file cpu.cfg contains the line:</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>CpuOption=SA1</PRE
></TD
></TR
></TABLE
><P
>if using a V850/SA1 module, or:</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>CpuOption=SB1</PRE
></TD
></TR
></TABLE
><P
>if using a V850/SB1 module.</P
></LI
><LI
><P
>Set the environment variable IEPATH to point to the libremote
server</P
><P
>directory.</P
></LI
></OL
></DIV
><DIV
CLASS="SECT3"
><H3
CLASS="SECT3"
><A
NAME="AEN4345">BUILD PROCEDURES</H3
><P
>A pre-built v850ice.exe executable is supplied in the loaders/v850-ceb_v850 directory
relative to the root of the eCos installation. However the following process
will allow the rebuilding of this executable if required:</P
><P
>For this example assume the v850ice libremote tree has been
copied to a directory named "server". The directory structure will
be similar to the following diagram:</P
><P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> server
|
devo
/ \
config libremote
/ \
lib v850ice</PRE
></TD
></TR
></TABLE
></P
><P
>Build the v850ice source as follows. Be sure to use the native
Cygwin compiler tools that were supplied alongside eCos.</P
><P
>cd server
mkdir build
cd build
../devo/configure --target=v850-elf --host=i686-pc-cygwin
make</P
><P
>The resultant libremote server image (v850ice.exe) can be
found in build/libremote/v850ice. Copy v850ice.exe
to the lib remote server directory.</P
></DIV
><DIV
CLASS="SECT3"
><H3
CLASS="SECT3"
><A
NAME="AEN4354">V850ICE.EXE EXECUTION</H3
><P
>The v850ice command line syntax is:</P
><P
>v850ice [-d] [-t addr] [port number]</P
><P
>The optional -d option enables debug output. The -t option
is associated with thread debugging - see the "eCos thread debugging"
section below for details. By default v850ice listens on port 2345
for an attach request from a gdb client. A different port number
may be specified on the command line.</P
><P
>To run the libremote server:</P
><P
></P
><OL
TYPE="1"
><LI
><P
>Power on the I.C.E. and target board.</P
></LI
><LI
><P
>Open a Cygwin window.</P
></LI
><LI
><P
>Run v850ice.</P
></LI
><LI
><P
>You will see the MDI interface window appear. In this
window you should see the "Connected to In-Circuit Emulator" message.
In the Cygwin window, the libremote server will indicate it is
ready to accept a gdb client connection with the message "v850ice:
listening on port 2345."</P
></LI
></OL
></DIV
><DIV
CLASS="SECT3"
><H3
CLASS="SECT3"
><A
NAME="AEN4369">V850-ELF-GDB EXECUTION</H3
><P
>Run the v850-elf-gdb client to debug the V850 target. It
is necessary to issue certain configuration commands to the I.C.E.
software. These commands may be issued directly in the MDI window
or they may be issued from the gdb client through the "monitor"
command.</P
><P
>On the Cosmo CEB-V850 board, on-chip Flash is mapped at address
0x0, the on-board EPROM at 0x100000 and the on-board RAM at 0xfc0000.
Since a stand alone V850 will start executing from address 0x0 on
reset, it is normal to load either an application or a bootstrap
loader for Flash at this address. eCos programs may be built to
boot from Flash or the on-board EPROM. If building for the on-board
EPROM, it would be expected that the Flash will contain the default
CEB-V850 flash contents. An ELF format version of the default contents
may be found in the eCos distribution with the name v850flash.img.</P
><P
>In stand alone operation, normally the code in this flash image
would have been programmed into the V850 on the Cosmo board, and
this would cause it to vector into the on-board EPROM to run the
application located there. In the case of eCos, this application
may be a GDB stub ROM application, allowing the further download
to RAM over serial of actual applications to debug.</P
><P
>As an example, we shall demonstrate how to use the I.C.E.
to download the v850flash.img and GDB stub EPROM image using I.C.E.
emulator memory only, and not requiring any actual programming of
devices.</P
><P
>v850-elf-gdb -nw
(gdb) file v850flash.img
(gdb) target remote localhost:2345
(gdb) monitor reset
(gdb) monitor cpu r=256 a=16
(gdb) monitor map r=0x100000-L 0x80000
(gdb) monitor map u=0xfc0000-L 0x40000
(gdb) monitor pinmask k
(gdb) monitor step
(gdb) monitor step
(gdb) monitor step
(gdb) monitor step
(gdb) load
(gdb) detach
(gdb) file gdb_module.img
(gdb) target remote localhost:2345
(gdb) load
(gdb) continue</P
><P
>NOTE: The four "monitor step" commands are only required the
first time the board is connected to the I.C.E., otherwise the program
will fail.</P
><P
>This is because of a limitation of the I.C.E. hardware that
means that the first time it is used, the "map" commands are not
acted on and the addresses "0x100000" and "0xfc0000" are not mapped.
This can be observed using the command "td e-20" in the MDI application"s
console to display the trace buffer, which will show that the contents
of address 0x100000 are not valid. Subsequent runs do not require
the "monitor step" commands.</P
><P
>It is unusual to load two executable images to a target through
gdb. From the example above notice that this is accomplished by
attaching to the libremote server, loading the flash image, detaching,
reattaching, and loading the ROM/RAM image. It is more
normal to build an executable image that can be executed directly.
In eCos this is achieved by selecting either the ROM or ROMRAM startup
type, and optionally enable building for the internal FLASH. The
I.C.E. emulator memory can emulate both the internal FLASH and the
EPROM, so real hardware programming is not required.</P
><P
>Upon running this example you will notice that the libremote
server does not exit upon detecting a detach request, but simply
begins listening for the next attach request. To cause v850ice
to terminate, issue the "monitor quit" or "monitor exit" command
from the gdb client. v850ice will then terminate with the next
detach request. (You can also enter control-c in the Cygwin/DOS
window where v850ice is running.)</P
></DIV
><DIV
CLASS="SECT3"
><H3
CLASS="SECT3"
><A
NAME="AEN4380">MDI INTERFACE VS. GDB INTERFACE</H3
><P
>If a filename is referenced in an MDI command, whether the
command is entered in the MDI window or issued from the gdb client
with the monitor command, the file must reside on the Windows NT
libremote server system. When specifying a filename when entering
a command in the MDI window it is obvious that a server local file
is being referenced. When issuing an MDI command from the gdb client, the
user must remember that the command line is simply passed to the
I.C.E. software on the server system. The command is executed by
the I.C.E. software as though it were entered locally.</P
><P
>Executable images may be loaded into the V850 target by entering
the "load" command in the MDI window or with the gdb "load" command.
If the MDI load command is used, the executable image must be located
on the server system and must be in S Record format. If the gdb
load command is used, the executable image must be located on the
client system and must be in ELF format.</P
><P
>Be aware that the gdb client is not aware of debugger commands
issued from the MDI window. It is possible to cause the gdb client
and the I.C.E. software to get out of sync by issuing commands from
both interfaces during the same debugging session.</P
></DIV
><DIV
CLASS="SECT3"
><H3
CLASS="SECT3"
><A
NAME="AEN4385">eCos THREAD DEBUGGING</H3
><P
>eCos and the V850 I.C.E. libremote server have been written
to work together to allow debugging of eCos threads. This is an
optional feature, disabled by default because of the overheads trying
to detect a threaded program involves.</P
><P
>Obviously thread debugging is not possible for programs with
"RAM" startup type, as they are expected to operate underneath a
separate ROM monitor (such as a GDB stub ROM), that itself would
provide its own thread debugging capabilities over the serial line.
Thread debugging is relevant only for programs built for Flash, ROM,
or ROMRAM startup.</P
><P
>To configure the libremote server to support thread debugging,
use the command:</P
><P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>(gdb) monitor syscallinfo ADDRESS</PRE
></TD
></TR
></TABLE
></P
><P
>at the GDB console prompt, where ADDRESS is the address of
the syscall information structure included in the applications.
In eCos this has been designed to be located at a consistent address
for each CPU model (V850/SA1 or V850/SB1). It
may be determined from an eCos executable using the following command
at a cygwin bash prompt:</P
><P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>v850-elf-nm EXECUTABLE | grep hal_v85x_ice_syscall_info</PRE
></TD
></TR
></TABLE
></P
><P
>At the current time, this address is 0xfc0400 for a Cosmo
board fitted with a V850/SA1, or 0xfc0540 for a Cosmo board
fitted with a V850/SB1.</P
><P
>So for example, the GDB command for the SB1 would be:</P
><P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>(gdb) monitor syscallinfo 0xfc0540</PRE
></TD
></TR
></TABLE
></P
><P
>Given that the syscallinfo address is fixed over all eCos
executables for a given target, it is possible to define it on the
libremote command line as well using the "-t" option, for example:</P
><P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>bash$ v850ice -t 0xfc0400
v850ice: listening on port 2345</PRE
></TD
></TR
></TABLE
></P
></DIV
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