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Bootloader can get the version of application for specific section, and then check if some features are supported. Developers can use the macro "ESP_IDF_VERSION" to limite some function like following: include "esp_idf_version.h" if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(3, 4, 0) && ESP_IDF_VERSION < ESP_IDF_VERSION_VAL(4, 0, 0) // 3.4 <= ver < 4.0 do_xxx_process(); endif
README esp-idf compile and 'AR' user program as target library 'libmain.a', so we should not use library which is named 'libmain.a'. We use 'libcore.a' instead of it. As I konwn, you can do following: 1. rename libmain.a to libcore.a 2. change text "*libmain.a:spi_flash.o(.literal .text .literal.* .text.*)" to "*libcore.a:spi_flash.o(.literal .text .literal.* .text.*)" in file 'eagle.app.v6.common.ld'