There are a few ways to connect GDB to an embedded system. You can place
a GDB server on the embedded platform. Or you can use a driver for the
in-circuit debugging of the chip. Most modern small processors offer an
in-circuit debugging interface that would be more powerful than a GDB
server, because it can halt and single-step the processor and examine a
halted processor. These use DebugWire, SWD, or JTAG. DebugWire and
Serial Wire Debug (SWD) are names for a one-wire JTAG replacement
suitable for 8-bit CPUs. There is a hardware device called ST-LINK that
is specific to hardware debugging on the STM32.
The Bus Pirate can drive JTAG and DebugWire, although I don't know if
anyone has yet used it for debugging rather than programming. Since it's
very versatile and Open Hardware, it's worth trying rather than the more
expensive processor-specific debugging device.
Thanks
Bruce
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