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Is it in the primary-bootloader (on the mb), or the secondary-bootloader(on the emmc)?

My motive behid the question is to understand what other codes are executed before system can get into fastboot mode

(Recently, I've been tinkering with a lot of different android devices and have tried to read up whatever comes up upon web-searches regarding "fastboot", "bootloaders", "primary bootloader", "secondary bootloaders". But this is one question I can't find any definitive answer about.)

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  • Any details needed?
    – rinfinity
    Aug 2, 2016 at 18:24
  • 1
    I will be blunt. It sits on its own partition, and can only really be touched by special programs. Download partitions viewer, it may show you what you need.
    – Dan Brown
    Aug 2, 2016 at 20:26
  • My motive behid the question was to understand what other codes are executed before system can get into fastboot mode.
    – rinfinity
    Aug 3, 2016 at 5:08
  • fair enough, though no idea how to answer your q.
    – Dan Brown
    Aug 3, 2016 at 8:37
  • You can try asking in the aosp email thread.
    – Fabio
    Aug 13, 2016 at 0:04

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Fastboot mode is in the bootloader and usually resides in a /dev/block, none of this is open sourced.

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