Is there a way to use GDB with BDM?

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Is there a way to use GDB with BDM?

Postby NSFW » Sun Aug 22, 2021 1:16 am

The GNU M68K toolchain includes the GDB debugger.
BDM is, in general, for connecting debuggers to hardware.
So, what would it take to get GDB to debug code in P01/P59 PCMs via BDM?

I ask because just stumbled on this how-to for using Eclipse for cross-dev / cross-debug with a $2000ish BDM tool:
http://download.ronetix.info/toolchains ... _guide.pdf

...and this list of GDB targets:
https://ftp.gnu.org/old-gnu/Manuals/gdb ... b_161.html

...and this GDB+BDM page:
https://cmp.felk.cvut.cz/~pisa/m683xx/bdm_driver.html

...and that got me wondering if there might be a way to use the same Eclipse + CDT + GNU-M68K setup with inexpensive BDM devices like the one from usbjtag.com.

I don't know much about GDB or BDM or embedded development in general to know how to put the pieces together, but it seems like there might be a way. Or, if not with usbjtag's hardware then perhaps with another BDM device (hopefully one that costs a lot less than Ronetix).

My aim here is to be able to write C, compile it, patch a .bin with the compiled code, and step through it with source-level debugging on a P01 or P59. The PCM doesn't need to be connected to an engine, I just want to be able to step through my code.

Eclipse can do the write/compile part. I can solve the bin patching part. But the GDB<->BDM part is a mystery to me.
Please don't PM me with technical questions - start a thread instead, and send me a link to it. That way I can answer in public, and help other people who have the same question. Thanks!

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Posts: 538
Joined: Fri Feb 02, 2018 3:13 pm

Re: Is there a way to use GDB with BDM?

Postby NSFW » Sun Aug 22, 2021 1:21 am

Almost forgot... there's also an M68K emulator here:
Github: https://github.com/cnvogelg/bare68k
Docs: https://bare68k.readthedocs.io/en/latest/
Connecting that to GDB would be just as good, perhaps even better.
Please don't PM me with technical questions - start a thread instead, and send me a link to it. That way I can answer in public, and help other people who have the same question. Thanks!

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