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esp_reset_reason_init would check for reset reason hint, and unconditionally set RTC_RESET_CAUSE_REG (which is also RTC_ENTRY_ADDR_REG) to hint value 0, i.e. 0x80000000. However the ROM code treats this value as valid deep sleep wake stub entry point, and tries to jump to it. Clear RTC_RESET_CAUSE_REG only if it contained a valid reset reason hint, and simply set the register value to 0 when doing so. Also add a check to esp_get_deep_sleep_wake_stub function that deep sleep wake stub entry address must be in IRAM. Reported in https://esp32.com/viewtopic.php?f=13&t=6919.
