[Open SoC Debug] CDM: Next Steps

Stafford Horne shorne at gmail.com
Tue Jun 12 23:13:24 CEST 2018

Hi Shivam,

As it was noted in Philip's mail it was suggested to work on the "CDM
Client" class.  This will help define the software side API of the CDM
hardware that the gdb-osd server will interact with.  In order to do
that you may also want to think about what API (functions) would be
required by the gdb server.  You can look at some example
implementations of those.

I would also suggest having a non gdb, more simple, debug interface.
The gdb debug interface is quite complicated and makes a lot of
abstractions via GDB.  Having a simple interface could make it easy to
independently verify your "CDM client" class.  Is there something
similar already for the MAM interface?

For software a good reference implementation for a gdb server is the
one from qemu:

  - qemu - https://git.qemu.org/?p=qemu.git;a=blob;f=gdbstub.c

There is also a openocd gdb server implementation:

  - http://repo.or.cz/openocd.git/blob/HEAD:/src/server/gdb_server.c

Bother are self contained and not huge.

On Wed, Jun 13, 2018 at 1:27 AM SHIVAM AGGARWAL <shivam16195 at iiitd.ac.in> wrote:
> Oh sorry. It was probably a misunderstanding on my part.
> I will continue with the OSD-GDB server bridge. I have already opened an issue: https://github.com/opensocdebug/osd-sw/issues/19
> I am reading about RSP protocol and looking at the source code of openOCD for reference: http://repo.or.cz/openocd.git/tree/HEAD:/src
> Thanks a lot for your guidance and support.
> Shivam Aggarwal
> On Tue, Jun 12, 2018 at 9:35 PM, Philipp Wagner <philipp.wagner at tum.de> wrote:
>> On 06/12/2018 05:55 PM, SHIVAM AGGARWAL wrote:
>>> Okay. I will complete the hardware implementation and get back to you soon. Also, I got access to Synopsys VCS through my institute's lab resources. I am currently learning how to use the tool.
>>> So, please guide me about the testing part as well.
>> Let's not do too many things at once. You started with the software part, and I'm proposing to continue down this path and finish it first before moving on to the next thing.
>> Philipp
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