When u-boot a kernel image with device tree blob, like
bootz 0x0a000000 - 0x09f00000
( 0x0a000000 is the location of the zImage, 0x9f00000 is the location of device tree blob)
The device tree blob is not passed to kernel as it is, the u-boot will fix up some value like memory bank range and size in the device tree blob.
For memory fix up, it is done in
arch_fixup_fdt, file arch/arm/lib/bootm-fdt.c
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