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I'm looking through my device and I noticed within /dev/block/platform/msm_sdcc.1/by-name that there is boot and aboot partitions. What is the difference between them? Mainly what is aboot?

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The Application Bootloader ABOOT boots the Android kernel/Recovery kernel.

It is the mechanism to download images onto the device from a host machine (like Windows/Linux PC).

On Samsung devices it runs the ODIN protocol on the device.

The Primary Bootloader boot part is a computer program that loads the main operating system or runtime environment for the computer after completion of the self-tests.

The PBL acts as a communication engine to download the Secondary Boot Loader (SBL) into the internal RAM and then activates it.

The SBL adds functions for erase and programming of flash memory and EEPROM; it also handles the actual download of new or updated software. This allows a minimum ROM utilization by the PBL

  • And what about the SBOOT – Jenabictak Apr 22 '18 at 7:13
  • Boot chain goes like this: Power ON --> BootRom/PBL --> SBL --> aboot --> boot | recovery. Boot is kernel (+ ramdisk optionally), not PBL. PBL is stored on SoC, all others are on flash storage partitions. – Irfan Latif Nov 10 at 17:47

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