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Also, there is UEFI firmware for it.

Can this UEFI firmware be ported to other ARM devices, e.g. phones, tablets, books?

Yes, it's just a port of the EDK2 UEFI reference firmware

Have you checked out uboot?

Doesn't everything under the sun boot with uboot? Uboot is usually what people want to replace when they say "why can't this just run UEFI?"

I have yet to find a valid reason for UEFI to replace u-boot, or UEFI to exist at all.