What does sh8 "hms" target talk to?

[Stan Shebs]

Grant Edwards wrote:

>Hi,
>
>I'm trying to figure out what the "hms" target talks to but I'm
>not getting very far.  According to the info file it talks to
>
>  "A Hitachi SH, H8/300, or H8/500 board, attached via serial
>   line to your host."
>
>One presumes that's overly general, and there actually has to
>be some specific chunk of SW running as a ROM monitor on the
>board.  What, exactly, does the "hms" target expect to be
>talking to?
>
It's looking for a human-friendly monitor; "r" for registers, "g" to
execute, etc; basically GDB acts as a fast typist. HMS is a couple
generations back, so it's unlikely that the current monitor is
sufficiently compatible.

>
> 1) Current h8 eval boards ship with something called the "HDI"
>    embedded monitor (or sometimes "HDI-M", which I gather is
>    the same thing).  Will gdb talk to that?  (I'm guessing
>    not.)
>
At least one person (found via Google) claims that the protocol is
similar to GDB's remote protocol, so maybe "target remote" or
"target extended-remote" will work.

>
> 2) If not, can one still get a monitor to which the hms target
>    will talk?
>
> 3) Is one better off just burning GDB stubs into flash?
>
> 4) Or maybe RedBoot (which contains gdb stubs)?
>
Apparently HDI source is not available, which means you can't fix target
problems that come up; I'd recommend replacing with your own stubs.

Stan