Install NixOS without boot partition on UEFI

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1

Can I install NixOS just use one partition? use UEFI and GPT?
the /boot and / all in one partition?

2

As far as I can see, UEFI needs at first a FAT partition, or CD/DVD, or network

See the specs: https://uefi.org/sites/default/files/resources/UEFI_Spec_2_9_2021_03_18.pdf

Chapter 13.3.1.1 and further

If you want one partition on your harddrive, you can use for example an USB drive to boot from

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