gdb.info: Renesas Boards
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Connecting to Renesas boards
Use the special `GDB' command `device PORT' if you need to explicitly
set the serial device. The default PORT is the first available port on
your host. This is only necessary on Unix hosts, where it is typically
something like `/dev/ttya'.
`GDB' has another special command to set the communications speed:
`speed BPS'. This command also is only used from Unix hosts; on DOS
hosts, set the line speed as usual from outside GDB with the DOS `mode'
command (for instance, `mode com2:9600,n,8,1,p' for a 9600bps
The `device' and `speed' commands are available only when you use a
Unix host to debug your Renesas microprocessor programs. If you use a
DOS host, GDB depends on an auxiliary terminate-and-stay-resident
program called `asynctsr' to communicate with the development board
through a PC serial port. You must also use the DOS `mode' command to
set up the serial port on the DOS side.
The following sample session illustrates the steps needed to start a
program under GDB control on an H8/300. The example uses a sample
H8/300 program called `t.x'. The procedure is the same for the Renesas
SH and the H8/500.
First hook up your development board. In this example, we use a
board attached to serial port `COM2'; if you use a different serial
port, substitute its name in the argument of the `mode' command. When
you call `asynctsr', the auxiliary comms program used by the debugger,
you give it just the numeric part of the serial port's name; for
example, `asyncstr 2' below runs `asyncstr' on `COM2'.
C:\H8300\TEST> asynctsr 2
C:\H8300\TEST> mode com2:9600,n,8,1,p
Resident portion of MODE loaded
COM2: 9600, n, 8, 1, p
_Warning:_ We have noticed a bug in PC-NFS that conflicts with
`asynctsr'. If you also run PC-NFS on your DOS host, you may need
to disable it, or even boot without it, to use `asynctsr' to
control your development board.
Now that serial communications are set up, and the development board
is connected, you can start up GDB. Call `gdb' with the name of your
program as the argument. `GDB' prompts you, as usual, with the prompt
`(gdb)'. Use two special commands to begin your debugging session:
`target hms' to specify cross-debugging to the Renesas board, and the
`load' command to download your program to the board. `load' displays
the names of the program's sections, and a `*' for each 2K of data
downloaded. (If you want to refresh GDB data on symbols or on the
executable file without downloading, use the GDB commands `file' or
`symbol-file'. These commands, and `load' itself, are described in
*Note Commands to specify files: Files.)
(eg-C:\H8300\TEST) gdb t.x
GDB is free software and you are welcome to distribute copies
of it under certain conditions; type "show copying" to see
There is absolutely no warranty for GDB; type "show warranty"
GDB 6.2.1, Copyright 1992 Free Software Foundation, Inc...
(gdb) target hms
Connected to remote H8/300 HMS system.
(gdb) load t.x
.text : 0x8000 .. 0xabde ***********
.data : 0xabde .. 0xad30 *
.stack : 0xf000 .. 0xf014 *
At this point, you're ready to run or debug your program. From here
on, you can use all the usual GDB commands. The `break' command sets
breakpoints; the `run' command starts your program; `print' or `x'
display data; the `continue' command resumes execution after stopping
at a breakpoint. You can use the `help' command at any time to find
out more about GDB commands.
Remember, however, that _operating system_ facilities aren't
available on your development board; for example, if your program hangs,
you can't send an interrupt--but you can press the RESET switch!
Use the RESET button on the development board
* to interrupt your program (don't use `ctl-C' on the DOS host--it
has no way to pass an interrupt signal to the development board);
* to return to the GDB command prompt after your program finishes
normally. The communications protocol provides no other way for
GDB to detect program completion.
In either case, GDB sees the effect of a RESET on the development
board as a "normal exit" of your program.
Created Mon Nov 8 17:42:39 2004 on tillpc with info_to_html version 0.9.6.