support for black magic probe upload method

[mczerski]

Hi,
It would be great if BMP were supported. Currently I'm using BMP with OpenOCD upload method but I need to modify mbed-cmake.gdbinit generated file to be able to debug.

[multiplemonomials]

Hmm, I can look into this. Does this probe have its own uploader and/or gdb server? What are the modifications you need to make?

[mczerski]

BMP runs its own gdbserver (on the probe itself) and comunicates over usb serial. So to use it I just start gdb and then connect to it with:

target extended-remote <path to serial device like ttyACM0>

and then to connect to the mcu I do:

monitor swdp (scan for connected devices)
attach <n> (connect to n'th device)

After that I can load/debug/or whatever. So basically my .gdbinit file has those three lines.
So to use debug-<target_name> target I need to change mbed-cmake.gdbinit file to have those three lines in it.
The flash-<target_name> is not usable with BMP now since it uses openocd. To support flashing with BMP the flash target would need to use gdb (connect/load/exit).

[multiplemonomials]

Hmm, that sounds like it could be tough because every build target would need its own gdbinit. Hmm maybe there's a way to pass commands to gdb on the command line instead.

[mczerski]

maybe --eval-command and --init-eval-command options may help with this ?