GDB stub

[Kai Ruottu]

"Robert J. Brown" wrote:

> I am looking for a gdb stub to support ppc860 using the phantom serial
> port of the Grammar Engines RomICE ROM simulator.  Does anyone have
> such a setup working?  This is also on new custom hardware.  We will
> be running C++ under eCos for this project.

 From the eCos (TX39) manual :

> -------------------- clip -----------------------
>
> Appendix A: CygMon (Cygnus ROM Monitor)
> ---------------------------------------
>
>  CygMon is a ROM monitor designed to be portable across a large
>  number of embedded systems. It is also completely compatible with
>  existing GDB protocols, thus allowing the use of a standard ROM
>  monitor with existing GNU tools across a wide range of embedded
>  platforms.
>
>  CygMon has basic program handling and debugging commands,
>  programs can be loaded into memory and run, and the contents of
>  memory can be viewed. There are several more advanced options
>  that can be included at compile time, such as a disassembler
>  (this of course increases the code size significantly).
>
>  Since CygMon contains a GDB remote stub, full debugging can be
>  done from a host running GDB to a target running CygMon.
>  Switching between CygMon monitor mode and GDB stub mode is
>  designed to be transparent to the user, since CygMon can detect
>  when GDB is communicating with the target and switch into stub
>  mode. When GDB stops communicating with the target normally, it
>  sends a termination packet which lets the stub know when to
>  switch to the CygMon monitor mode.
> -------------------- clip -----------------------

 The ARM manual mentions CygMon too, but the PPC-one seems to lack
it... Anyone tried CygMon?  The sources should be there, but I don't
remember seeing them (only prebuilt images for some boards).

Cheers, Kai


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