Constant esp_idf_svc::sys::esp_flash_speed_s_ESP_FLASH_120MHZ

pub const esp_flash_speed_s_ESP_FLASH_120MHZ: u32 = 120; // 120u32

< The flash runs under 120MHz, 120MHZ can only be used by main flash after timing tuning in system. Do not use this directely in any API.