It looks like I made a fatal mistake by connecting the NRST pin to the PA0 pin on an STM32F778AIY. This is a part with no internal voltage regulator for the core so the PA0 pin acts like a power on reset. This hasn't caused problems with power cycling but it does seem to cause a problem with using the SWD debugger or programming flash via JTAG. I can use Cube Programmer to connect to the device fine as long as I use the Core Reset option, but as soon as I try to program a flash, I see the NRST pin driven which in turn drives the PA0 pin. This causes all kinds of problems, including not being able to use the SWD debugger.
Does anyone know how I might fix this situation besides disconnecting the NRST pin from PA0 pin? I assume I need to modifiy/find flash algorithms which don't drive NRST.
