Need info about x86 Aboot and the Secondstage binary

I want to port DUET/Clover to the Asus Zenfone 2/Zoom/etc but I would need more information about the boot process.
Especially if the second.bin from the image gets loaded first/before the kernel elf image and why it is needed(the cpu is at that stage already in protected mode so a second stage boot loader wouldn't be needed at all as I understand).
Thanks a lot in advance.

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