from what I could read in the esptool repo:
*I'll digg esptool.py, but the lines 46..56 ( "add_spi_flash_subparsers" ) & 825..852 ( "write_flash" ) seems of interest, as well as the following links: https://github.com/themadinventor/esptool/issues/105 , from a coment in previous link's page - spi_flash.h
lastly, from the esp8266 datasheet:
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