hardware support for gdb?

[Andrew Cagney]

> I have an ARM board which comes with its own boot monitor, which just brings
> up the board. I download RedBoot to bring the target up as well as to
> connect with gdb. My question is, what is minimal support required from a
> target hardware so that an application like RedBoot can work on it to
> connect with gdb and provide debugging.

Some sort of "serial" communications channel (from a simple serial 
device through to mini-tcp on an ethernet device).

Andrew