Hi Splin,
Well, you can use any GDB server so you can also use OpenOCD. However, most GDB servers don't support live variables (if not all) so for live variables you have to use EBlink (or older Embitz STlinkGdb).
With the STlink-V2 you can debug any cortex-m device and the only thing that is needed is a script for EBlink how to flash the device. Flash strategies are different between vendors and MCU types so that's why that part is done with scripting so it can be changed or extended without the need of rebuilding the tools.
CMSIS-dap is on the list to-do but not with a high priority.
Yes, jtag is a bit faster but needs more pins. The smaller devices don't support jtag because of the number of available pins. SWD can also be very fast (the stlink-v3 is very fast) this depends how how fast the probe is.
Well, you can use any GDB server so you can also use OpenOCD. However, most GDB servers don't support live variables (if not all) so for live variables you have to use EBlink (or older Embitz STlinkGdb).
With the STlink-V2 you can debug any cortex-m device and the only thing that is needed is a script for EBlink how to flash the device. Flash strategies are different between vendors and MCU types so that's why that part is done with scripting so it can be changed or extended without the need of rebuilding the tools.
CMSIS-dap is on the list to-do but not with a high priority.
Yes, jtag is a bit faster but needs more pins. The smaller devices don't support jtag because of the number of available pins. SWD can also be very fast (the stlink-v3 is very fast) this depends how how fast the probe is.