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tools embedded stm32 jtag swd *blackmagicprobe *hack *awesomeness
Black Magic Probe is a sophisticated JTAG and SWD adapter supporting
flashing and debugging some Cortex-M3 microcontrollers, in particular
the STM32 family. blacksphere.co.nz

It integrates a GDB server and exposes it over a standard ACM
channel. Just plug it in and connect with gdb, no extra software or
drivers needed.

If you want to try it for cheap, you can reflash any ST-Link with a
version from github.com built with "make
PROBE_HOST=stlink" by using another SWD-capable programmer (desolder
the "DEFAULT" bridges, solder "PRG-32", use CN3 for flashing).

But if you want to get the full functionality (including
DFU-upgradeable probe firmware, an additional auxilary UART, full JTAG
support and experimental SWO), read on about more hardware hacking in
the follow-up post.