Resolved! What does generally cause "ST-LINK device status: LOCKUP"?
I have an application for Nucleo-H7A3ZI-Q which causes "ST-LINK device status: LOCKUP" very early into an execution, as early as 2/3 of the way into initialized data section copy loop in startup.s. STMicroelectronics ST-LINK GDB server. Version 5.2.3...