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Subject: minimal stub? (GDB Remote Serial Protocol)
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Hi!

I would like to implement a minimal stub which can communicatig with
arm-elf-gdb 6.0. The documentation
( http://sources.redhat.com/gdb/current/onlinedocs/gdb_33.html ) says,
that:

| For any command not supported by the stub, an empty response (`$#00')
| should be returned. That way it is possible to extend the protocol. A
| newer GDB can tell if a packet is supported based on that response.
|
| A stub is required to support the `g', `G', `m', `M', `c', and `s'
| commands. All other commands are optional.

So I tried first to accept all packets coming from gdb with '+', and send
a response '$#00' until any of the `g', `G', `m', `M', `c', or `s' is
coming. (-> means arm-elf-gdb -> WE_ARE_HERE; <- means opposite direction)

$ arm-elf-gdb
GNU gdb 6.0
Copyright 2003 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain condition=
s.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "--host=3Di686-pc-linux-gnu --target=3Darm-elf".
(gdb) set remotebaud 57600
(gdb) target remote /dev/ttyS1
Remote debugging using /dev/ttyS1

[and now the communication on /dev/ttyS1]

-> +
-> $Hc-1#09
<- +

<- $#00
-> +

-> $qC#b4
<- +

<- $#00
-> +

-> $qOffsets#4b
<- +

<- $#00
-> +

-> $?#3f
<- +

<- $#00
-> +

And now at the arm-elf-gdb's prompt I get:
"warning: Invalid remote reply:"

Bad luck, none of the minimal stub commands found.

Have I misunderstand the documentation or it is out of date?

Where can I have up to date informations? (e.g. which file in the
gdb source tree)

Thanks.

	M=E1rton N=E9meth

Student of University of Technology and Economics, Hungary