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1. support save cal data in nvs; 2. support use phy partition to store init data; In old SDK, we use (max_sec - 3) as init data sector, and (max_sec - 4) as cal data sector. This is changed in IDF style SDK, and these 2 sectors can be used for other perpose.
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'