Work in progress ESP32 dual core target

ESP32 OpenOCD port now has a work-in-progress branch which improves dual core debugging support: https://github.com/espressif/openocd-esp32/tree/feature/esp32_dualcore

• To use the new target, start openocd with the esp32_dc.cfg config file found in openocd root directory:

  src/openocd -s tcl -f esp32_dc.cfg
  

• Create the following gdbinit file:

  target remote :3333
  mon reset halt
  thb app_main
  x $a1=0
  c
  

• Disable "Stop program on scheduler start when JTAG/OCD is detected" option in menuconfig > Component config > FreeRTOS.

• Start GDB:

  xtensa-esp32-elf-gdb -x gdbinit build/your-app.elf
  

• When debugging in Eclipse using "GDB Hardware Debugging" plugin, use the following init sequence:

  mon reset halt
  x $a1=0
  

  Check the "Halt", "Set breakpoint at" (app_main), "Resume" options to make the debugger stop at app_main.