[U-Boot] U-Boot loading kernel from mmc question

I am trying to figure out how the bootm command in U-Boot works. It seems to be a state machine that goes from start->findos->findother (fdt)->loados etc.

However I am having trouble understanding how, since my linux image is stored in some partition on the device (eMMC), does that get loaded into memory?

Originally I thought this was what bootm_find_os and bootm_load_os does, but they don't seem to access the block devices or filesystem or contain code that reads in the linux and fdt images into memory.

Am I missing a step here?

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