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eMMC layout for custom boot

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I need to load a custom bootloader (or tiny OS) from eMMC on my "HiKey LeMaker version (1 GB RAM). I understand from datasheet that when BOOT_SEL = 1 and NAND_BOOT = 0 the boot rom in the SOC loads the image in eMMC.  Is there any documentation that explains how the image in eMMC should be flashed so that my custom boot image gets loaded into RAM and jumps to the right entry point?

Aananth C N
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