Find a description how to modify a Discovery Board to use it's Stlink as
black magic debug at
http://embdev.net/articles/STM_Discovery_as_Black_Magic_Probe
Differences between V1/V2
V1 V2
ID Pins PC13/14 unconnected PC 13 pulled low
LED STLINK PA8, active High PA9, Dual Led
MCO Out NA PA8
RESET(Target) T_JRST(PB1) NRST (PB0)
On the NucleoXXXP boards, e.g. NUCLEO-L4R5ZI (144 pin) or
NUCLEO-L452RE-P (64 pins), by default nRst is not connected. To reach the
target nRST pin with the "mon connect_reset enable" option, the right NRST
jumper must be placed. On Nucleo144-P boards it is JP3, on NUCLEO64-P
boards it is JP4.