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This commit renames all registers in xtensa/specreg.h to by adding the prefix XT_REG_. This is done to avoid naming collisions with similar variable names. A new register file, viz., xt_specreg.h is created. The previous names are still available to use but have been deprecated. Closes https://github.com/espressif/esp-idf/issues/12723 Merges https://github.com/espressif/esp-idf/pull/16040
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.)