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eea76d14bb
1. add some efuse api to get rtc & digital voltage 2. set dig_rtc voltage to a fix value storing in efuse no mater which cpu frequency 3. modify hardware code in bootloader to fit all c3 ECO3 version
Bootloader Support Component ============================ Overview -------- "Bootloader support" contains APIs which are used by the bootloader but are also needed for the main app. Code in this component needs to be aware of being executed in a bootloader environment (no RTOS available, BOOTLOADER_BUILD macro set) or in an esp-idf app environment (RTOS running, need locking support.)