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Add .eh_frame and .eh_frame_hdr sections to the binary (can be enabled/disabled within menuconfig). These sections are parsed when a panic occurs. Their DWARF instructions are decoded and executed at runtime, to retrieve the whole backtrace. This parser has been tested on both RISC-V and x86 architectures. This feature needs esptool's merge adjacent ELF sections feature.
See the spi_flash.rst in the programming guide folder for more details. The docs above is for the new SPI Flash API above 4.0, for legacy implementation (CONFIG_SPI_FLASH_USE_LEGACY_IMPL enabled), read README_legayc.rst in the same folder with this readme.