hi i am trying to run gdb for blinky which is using nordic-blinky-zephyr.elf and using nrf52840 board when i am trying gdb not working about renode

[monikaveeravalli]

hi i am trying to run gdb for the script blinky and blinky starts but i am unable to run gdb
machine StartGdbServer 3333 after giving thsi command it says port is connected but gdb is not opening nor i am not getting the gdb server board
it says i cannot load elf file and arm-gcc npot found
can you help me with the working gdb steps by working with the zephyr blinky and also how to toggle or change the gpio pin without a button