traceswo: Make the input channel and trig configurable (Only IC1 and IC2 can work)
swlink: Add traceswo
usbdfu: Do not implicit use BLACKMAGIC if BOARD define is missing
f4 variants: Disable traceswo as long as the endpoint allocation problem is not solved
usbdfu: Rearrange code to have common things together
SWLINK: The Led is on a fixed pin. Writing to an undefined pin may cause havok.
swlink: disable traceswo for now
gdb.py: handle empty blocks for commit() to avoid division by zero
hexprog.py: Don't print empty lines when listing the flash block sizes
swlink/stlink: document connector layout