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32kHz xtal RTC source ESP32

I am wondering how to enable a 32khz xtal as the RTC source for an ESP32. Is this correct? Also do i need to do anything in my code to specify the xtal is connected to GPIO32 and 33 (dedicated GPIO for xtal)

build_vars:
  ESP_IDF_SDKCONFIG_OPTS: "${build_vars.ESP_IDF_SDKCONFIG_OPTS} CONFIG_ESP32_RTC_CLOCK_SOURCE_EXTERNAL_CRYSTAL=y"
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